All posts by Mainaksh Singh

The Ganges river in India is considered one of the most polluted rivers in the world, with high levels of fecal coliform bacteria, heavy metals, and other pollutants. To address this issue, several biotechnology projects have been developed to use bacteria to clean up the river.

1. Bio-remediation using indigenous microorganisms: The National Environmental Engineering Research Institute (NEERI) has developed a technology that uses indigenous microorganisms to break down organic pollutants in the river. The microorganisms are naturally present in the river and are stimulated through the addition of nutrients. This process helps in the reduction of the pollution load in the river.
2. Bioreactors: A bioreactor is a device that uses living organisms to break down pollutants. In this case, bacteria are used to clean up the river. The Indian Institute of Technology (IIT) Roorkee has developed a floating bioreactor that can be placed in the river. The bioreactor contains a mix of bacteria and algae that break down the organic matter in the river. The process also helps in the removal of heavy metals and other pollutants.
3. Bacterial Bio-filters: A team of researchers from the University of California, Berkeley, and the Indian Institute of Technology (IIT) Delhi, have developed a bacterial bio-filter that can be used to remove pollutants from the river. The bio-filter consists of a porous medium that is filled with bacteria that break down pollutants. The filter is designed to be placed in the river, allowing the water to flow through it, and thus removing the pollutants.
4. Biodegradable plastic: Plastic waste is a significant contributor to pollution in the river. To address this issue, researchers have developed biodegradable plastic made from bacteria. The plastic is made from a type of bacteria that naturally breaks down in the environment. This means that the plastic will not contribute to the pollution in the river and will eventually break down into harmless substances.
5. Bacteriophages: Bacteriophages are viruses that specifically target and kill bacteria. Researchers at the Indian Institute of Technology (IIT) Roorkee have developed a bacteriophage-based system to remove bacteria from the river. The system involves introducing bacteriophages into the river, which then target and kill the harmful bacteria, thus reducing the pollution load in the river.
6. Microbial fuel cells: Microbial fuel cells are devices that use bacteria to generate electricity. Researchers at the Indian Institute of Technology (IIT) Kharagpur have developed microbial fuel cells that can generate electricity while cleaning the Ganges river. The fuel cells use bacteria to break down organic matter in the river, generating electricity in the process. This technology has the potential to provide a sustainable source of energy while simultaneously reducing pollution in the river.
7. Biosensors: Biosensors are devices that use biological components to detect pollutants in the environment. Researchers at the Indian Institute of Technology (IIT) Roorkee have developed biosensors that can detect pollutants in the Ganges river. The biosensors use bacteria that produce light in the presence of pollutants, allowing for real-time detection and monitoring of pollution levels in the river.
8. Phytoremediation: Phytoremediation is a process that uses plants to remove pollutants from the environment. Researchers at the Indian Institute of Technology (IIT) Kharagpur have developed a phytoremediation system to clean up the Ganges river. The system involves growing aquatic plants in the river that can absorb pollutants such as heavy metals and organic matter. The plants are then harvested and disposed of, removing the pollutants from the river.
9. Biochar: Biochar is a type of charcoal that is made by heating organic material in the absence of oxygen. Researchers at the Indian Institute of Technology (IIT) Delhi have developed a biochar-based system to clean up the Ganges river. The system involves introducing biochar into the river, which then adsorbs pollutants such as heavy metals and organic matter. The biochar can then be harvested and disposed of, removing the pollutants from the river.
10. Bioplastics: Bioplastics are plastics that are made from renewable resources and can biodegrade in the environment. Researchers at the Indian Institute of Technology (IIT) Kharagpur have developed a bioplastic-based system to clean up the Ganges river. The system involves introducing biodegradable plastics into the river, which then biodegrade into harmless substances. This reduces the amount of plastic waste in the river, which is a significant contributor to pollution.
11. Nanotechnology: Nanotechnology involves the use of nanoscale materials to achieve specific functions. Researchers at the Indian Institute of Technology (IIT) Kharagpur have developed a nanotechnology-based system to clean up the Ganges river. The system involves using nanomaterials to remove pollutants such as heavy metals and organic matter from the water. The nanomaterials can then be removed from the water, leaving behind clean water.
12. Bioaugmentation: Bioaugmentation involves adding beneficial microorganisms to an ecosystem to enhance its performance. Researchers at the Indian Institute of Technology (IIT) Delhi have developed a bioaugmentation system to clean up the Ganges river. The system involves introducing beneficial microorganisms into the river that can break down pollutants such as heavy metals and organic matter. The microorganisms are selected based on their ability to thrive in the harsh conditions of the river and their effectiveness at breaking down pollutants.
13. Constructed wetlands: Constructed wetlands are artificial wetlands that are designed to treat wastewater and remove pollutants. Researchers at the Indian Institute of Technology (IIT) Bombay have developed a constructed wetland system to clean up the Ganges river. The system involves creating a series of wetlands that treat the water as it flows through them. The wetlands are designed to remove pollutants such as heavy metals and organic matter, as well as nutrients such as nitrogen and phosphorus, which can contribute to harmful algal blooms.

In conclusion, the use of biotechnology and bacteria to clean up the Ganges river is an innovative approach that offers promising solutions to the problem of pollution. These projects highlight the potential of these technologies to provide sustainable and effective solutions to environmental challenges. With continued research and development, these technologies could be scaled up and deployed on a larger scale, providing significant benefits to the health and well-being of the communities that rely on the Ganges river.

Chronology of some of the key developments in quantum computing research over the past few decades.

• 1981: Richard Feynman proposes the idea of a quantum computer as a way to simulate quantum systems.
• 1982: Paul Benioff proposes a quantum mechanical model of a Turing machine.
• 1985: David Deutsch proposes the first quantum algorithm, which is designed to solve the problem of simulating quantum systems.
• 1986: David Deutsch develops the concept of a universal quantum computer.
• 1988: Charles Bennett and Gilles Brassard develop quantum key distribution (QKD), a method of secure communication using quantum cryptography.
• 1991: Peter Shor discovers an algorithm for factoring large numbers using a quantum computer, which has significant implications for cryptography.
• 1994: Peter Shor publishes his algorithm for factoring large numbers in polynomial time.
• 1995: The first experimental demonstration of a quantum algorithm is carried out using nuclear magnetic resonance (NMR) technology.
• 1996: The first quantum teleportation experiment is carried out, demonstrating the possibility of transmitting quantum information over long distances.
• 1998: The first stable, controllable qubits (quantum bits) are developed using ion trap technology.
• 2000: Researchers at IBM demonstrate a 2-qubit quantum computer using nuclear magnetic resonance (NMR) technology.
• 2001: The first successful implementation of Shor’s algorithm for factoring a small number is carried out using a 7-qubit quantum computer.
• 2005: The first 12-qubit quantum computer is developed using ion trap technology.
• 2007: The first quantum error correction code is proposed, which allows for the correction of errors that occur during quantum computations.
• 2011: The D-Wave One, a commercial quantum computer, is released.
• 2012: Researchers at the University of Bristol demonstrate the first all-photonic quantum computer.
• 2014: Researchers at the University of New South Wales demonstrate the first single-qubit gate in silicon.
• 2015: Researchers at MIT and Harvard University demonstrate a new type of qubit, called a “flip-flop qubit,” which could significantly improve the stability and scalability of quantum computers.
• 2016: Google announces that it has developed a 9-qubit quantum computer that can perform some calculations faster than a classical computer.
• 2017: IBM announces that it has developed a 50-qubit quantum computer, marking a significant milestone in the development of large-scale quantum computers.
• 2018: Google announces that it has developed a 72-qubit quantum computer.
• 2019: Researchers at the University of Chicago and Argonne National Laboratory develop a new type of qubit, called a “topological qubit,” which could be more robust than other types of qubits.
• 2020: Google announces that it has achieved “quantum supremacy,” meaning that its 53-qubit quantum computer has solved a problem that is beyond the capabilities of classical computers.
• 2021: IBM announces that it has developed a 127-qubit quantum computer.

 

There are several top scientists in the field of quantum computing who are leading the way in advancing our understanding of this exciting and rapidly evolving field. Here are some of the most prominent names in quantum computing research:

1. Peter Shor: A mathematician and computer scientist who is best known for his work on Shor’s algorithm, which is a quantum algorithm that can efficiently factor large numbers. This algorithm is one of the most famous examples of a quantum algorithm and has significant implications for cryptography.
2. David Deutsch: A physicist who is widely regarded as one of the pioneers of quantum computing. He is known for his work on quantum algorithms, quantum error correction, and the concept of quantum parallelism.
3. John Preskill: A physicist who has made significant contributions to the study of quantum information and computation, including the development of the concept of quantum error correction and fault-tolerant quantum computing.
4. Seth Lloyd: A physicist and computer scientist who has worked on a wide range of topics in quantum computing and quantum information theory, including the development of quantum algorithms for simulating quantum systems.
5. Michelle Simmons: An experimental physicist who has made significant contributions to the development of quantum computing hardware, including the development of the first single-atom transistor and the first two-qubit gate in silicon.
6. John Martinis – John Martinis is a professor of physics at the University of California, Santa Barbara, and is known for his pioneering work in the field of superconducting qubits. He has been involved in the development of many key technologies that are critical to the design of quantum processors.
7. Michel Devoret – Michel Devoret is a professor of physics at Yale University and has made significant contributions to the field of quantum computing, particularly in the area of quantum error correction.
8. Isaac Chuang – Isaac Chuang is a professor of electrical engineering and computer science at MIT and is known for his contributions to the field of quantum information science, including his work on the development of quantum algorithms and quantum error correction codes.
9. Andrew Yao – Andrew Yao is a professor of computer science at Tsinghua University in China and is known for his contributions to the theory of quantum computing, including the development of the concept of quantum circuits.
10. David DiVincenzo – David DiVincenzo is a physicist and professor at the Institute for Quantum Information at RWTH Aachen University in Germany. He has made significant contributions to the development of quantum computing and is known for his work on the concept of the “DiVincenzo criteria,” a set of guidelines for building a scalable quantum computer.

The DiVincenzo criteria, also known as the DiVincenzo requirements, are a set of five requirements that a physical system must meet in order to be considered a viable candidate for building a quantum computer. They were first proposed by David DiVincenzo in 1996 and have since become a widely accepted standard in the field of quantum computing. The five DiVincenzo criteria are as follows:

1. A scalable physical system with well-characterized qubits – The system should be scalable, meaning that it can be expanded to include a large number of qubits. Additionally, the qubits should be well-characterized and have a long coherence time, meaning that they can maintain their quantum states for a long period of time.

2. The ability to initialize the qubits to a known state – The system should be able to initialize the qubits to a known state so that they can be used for quantum computations.

3. Long coherence times for the qubits – The qubits should have a long coherence time, meaning that they can maintain their quantum states for a long period of time.

4. A universal set of quantum gates – The system should be able to implement a universal set of quantum gates, which are the basic building blocks of quantum circuits. This means that any quantum computation can be constructed from a combination of these gates.

5. A qubit-specific measurement capability – The system should be able to measure individual qubits without disturbing the quantum state of the other qubits in the system.

These criteria are important because they provide a framework for evaluating the suitability of different physical systems for building a quantum computer. By meeting these criteria, a physical system has the potential to perform complex quantum computations that are beyond the capabilities of classical computers.

The design of a physical system that meets the DiVincenzo criteria is a complex and ongoing research effort in the field of quantum computing. While many different physical systems have been proposed and investigated for building a quantum computer, one of the most promising approaches is the use of superconducting qubits. Superconducting qubits are based on the principles of superconductivity, a phenomenon in which certain materials can conduct electricity with zero resistance at very low temperatures.

The basic design of a superconducting qubit involves a small loop of superconducting wire, known as a Josephson junction, that is interrupted by a non-superconducting region. This non-superconducting region acts as the qubit, which can exist in two states, known as the |0⟩ state and the |1⟩ state. These states correspond to the direction of current flowing through the junction and can be manipulated using microwave pulses.

To meet the DiVincenzo criteria, a superconducting qubit system must be able to scale to a large number of qubits, have long coherence times, be able to initialize and measure individual qubits, and implement a universal set of quantum gates. This requires a complex system of control electronics, microwave generators, and measurement equipment, as well as sophisticated algorithms for performing quantum computations.

Researchers in the field of quantum computing are constantly working to improve the design of superconducting qubits and develop new physical systems that meet the DiVincenzo criteria. Other physical systems that have been proposed for building a quantum computer include trapped ions, quantum dots, and topological qubits, among others. Each of these approaches has its own strengths and challenges, and the ultimate design of a large-scale quantum computer may incorporate multiple physical systems.

A Josephson junction is a type of electrical circuit that is made from two superconductors separated by a thin insulating layer or a weak link, typically made of a non-superconducting material. The junction is named after Brian D. Josephson, who predicted its existence in 1962.

The key feature of a Josephson junction is the Josephson effect, which is a quantum mechanical phenomenon that allows for the flow of electrical current between the two superconductors without any voltage difference. This effect arises due to the tunneling of Cooper pairs, which are the paired electrons that give rise to superconductivity, through the insulating layer.

Josephson junctions are widely used in various applications such as SQUIDs (Superconducting Quantum Interference Devices), which are highly sensitive magnetic field detectors used in medical imaging and other scientific fields. They are also used in superconducting digital circuits such as RSFQ (Rapid Single Flux Quantum) circuits and as the basic building blocks of superconducting qubits in quantum computing.

In superconducting qubits, a Josephson junction is used to create a non-superconducting region that acts as the qubit. By applying a magnetic field or a microwave pulse to the junction, the state of the qubit can be manipulated. The Josephson junction is a critical component in superconducting qubits and plays a key role in achieving the long coherence times and scalability required for building a practical quantum computer.

The size of Sycamore, which is Google’s first quantum computer to achieve quantum supremacy, is difficult to quantify as it involves several different components and subsystems. However, Sycamore is built using a technology called superconducting qubits, and its processor chip contains 54 such qubits arranged in a 2D grid pattern.

The chip itself is relatively small, with a size of around 1 cm by 1 cm. However, the chip is mounted inside a large, cryogenically cooled system that is used to maintain the qubits at extremely low temperatures, near absolute zero. The size of this cooling system, which includes a complex network of wiring, control electronics, and other components, is much larger than the chip itself.

It’s worth noting that the size of a quantum computer’s processor is not the only factor that determines its performance. Other important factors include the coherence time of the qubits, the quality of the control electronics, and the algorithms used to perform quantum computations. Nonetheless, the size and complexity of quantum computer systems are expected to grow significantly in the coming years as researchers work to scale up the number of qubits and improve the performance of quantum computers.

A cryogenically cooled system is a system that is designed to maintain very low temperatures using cryogenic fluids such as liquid helium or liquid nitrogen. Cryogenic cooling is often used in superconducting systems, including superconducting qubits used in quantum computing, because these systems require extremely low temperatures to function.

In a cryogenically cooled quantum computing system, the processor chip containing the qubits is typically mounted inside a large, vacuum-sealed chamber that is cooled to near absolute zero temperatures (around -273°C or -459°F) using liquid helium. The chamber and the cooling system are designed to shield the qubits from external sources of noise and to protect them from thermal fluctuations that can cause decoherence and lead to errors in quantum computations.

The cryogenic cooling system for a quantum computer is a complex and expensive component of the overall system. The system typically includes a large refrigerator or cryostat that is used to produce and maintain the cryogenic temperatures, as well as a network of pipes, pumps, and other components used to circulate the cryogenic fluids and control the temperature of the system.

While cryogenic cooling is essential for the operation of superconducting qubits and other quantum computing systems, it also presents significant technical and practical challenges. Cryogenic systems require careful design and maintenance to avoid thermal leaks and to ensure the proper functioning of the cooling components. Additionally, cryogenic fluids such as liquid helium can be expensive and difficult to obtain, making the operation of large-scale cryogenically cooled quantum computing systems challenging and costly.

The cost of a cryogenic cooling system for a quantum computer can vary widely depending on a variety of factors, including the size of the system, the required cooling capacity, and the specific cryogenic fluids used.

As an example, the cooling system for Google’s Sycamore quantum computer, which contains 54 qubits, is estimated to cost several million dollars. This includes the cost of the cryostat, the refrigeration equipment, and the necessary components for controlling and monitoring the temperature of the system.

The cost of a cryogenic cooling system can also depend on the specific technology used. For example, some quantum computing systems use alternative cooling technologies such as dilution refrigeration, which can be more expensive and complex to operate than traditional liquid helium-based systems.

It’s worth noting that the cost of cryogenic cooling systems is just one component of the overall cost of a quantum computing system, which also includes the cost of the qubits, control electronics, and other components. However, cryogenic cooling is a critical component of quantum computing, and the cost and complexity of cooling systems can pose significant challenges to the development and scaling of practical quantum computing technologies.

The size of a cryostat used in a quantum computing system can vary depending on the specific design of the system and the number of qubits it contains.

For example, the cryostat used in Google’s Sycamore quantum computer, which contains 54 qubits, is roughly the size of a large kitchen refrigerator. It is about 2 meters tall and 1 meter wide, and it weighs several tons.

The cryostat typically consists of several layers, including an outer vacuum jacket, an inner radiation shield, and a cryogenic cooling chamber that contains the qubits and other components of the quantum computing system. The inner chamber is typically made of materials with high thermal conductivity, such as copper or aluminum, to help distribute the cryogenic temperatures evenly across the qubits and other components.

It’s worth noting that the cryostat is just one component of the overall quantum computing system and that the size and complexity of the entire system can vary widely depending on the specific design and requirements of the system. Nonetheless, cryostats are essential components of cryogenically cooled quantum computing systems and are critical for maintaining the low temperatures required for the operation of superconducting qubits.

India has several research facilities that are involved in the development of superconducting qubits for quantum computing. Some of the major institutions in this field include:

Indian Institute of Science (IISc): The Department of Physics at IISc has a dedicated Quantum Information and Computation (QuIC) group that is involved in the development of superconducting qubits for quantum computing. The group is also involved in research on other quantum computing technologies, including ion trap and topological quantum computing.

Bhabha Atomic Research Centre (BARC): BARC is one of the premier nuclear research centers in India, and it has a dedicated quantum information and computing laboratory that is involved in research on superconducting qubits. The laboratory is also involved in research on other quantum computing technologies, such as quantum cryptography and quantum communication.

Tata Institute of Fundamental Research (TIFR): TIFR is a leading research institution in India that is involved in a wide range of scientific research, including research on superconducting qubits for quantum computing. TIFR has a dedicated Quantum Information and Computation group that is involved in both theoretical and experimental research in this field.

Indian Space Research Organisation (ISRO): In addition to its cryogenic engineering center, ISRO also has a Space Applications Centre that is involved in the development of quantum computing technologies for space applications. This includes research on superconducting qubits and other quantum computing technologies.

Overall, India has a growing research community in the field of quantum computing, and there is significant interest in the development of superconducting qubits as a key technology for building practical quantum computers.

he head of the Quantum Information and Computation (QuIC) group at the Indian Institute of Science (IISc) in Bangalore, India was Prof. Arvind. However, it’s possible that there may have been a change in leadership since then. Prof. Arvind is a well-known physicist and computer scientist who has made significant contributions to the field of quantum computing, including the development of efficient algorithms for quantum computers and the study of quantum entanglement.

Prof. Arvind (full name: Arvind Sangwan) is a renowned physicist and computer scientist who is currently a faculty member at the Department of Physics and the Department of Computer Science and Automation at the Indian Institute of Science (IISc) in Bangalore, India. He is also the head of the Quantum Information and Computation (QuIC) group at IISc.

Prof. Arvind’s research interests include quantum computing, quantum information theory, and the intersection of quantum computing and classical algorithms. He has made significant contributions to the field of quantum computing, including the development of efficient quantum algorithms for several problems, and has also contributed to the development of quantum error-correction codes.

In addition to his research work, Prof. Arvind is also involved in several outreach activities aimed at promoting scientific education and awareness in India. He has co-authored several books on computer science and mathematics, and has also delivered lectures and workshops on these topics to a wide range of audiences.

Prof. Arvind Sangwan obtained his Bachelor’s degree in Electrical Engineering from the Indian Institute of Technology (IIT) Kanpur in 1990. He then went on to obtain his Ph.D. in Physics from the University of California, Berkeley, USA in 1997.

During his Ph.D., Prof. Arvind worked on various topics in theoretical physics, including string theory, black holes, and quantum gravity. After completing his Ph.D., he did postdoctoral research at the Institute for Advanced Study in Princeton, New Jersey, USA, and at the University of California, Santa Barbara, USA.

Later, Prof. Arvind transitioned to the field of quantum computing and joined the Indian Institute of Science (IISc) in Bangalore, India, where he is currently a faculty member at the Department of Physics and the Department of Computer Science and Automation. He has been actively involved in research and education in the field of quantum computing for more than a decade.

Prof. Arvind Sangwan has contributed to several books on quantum computing, including:

“Introduction to Quantum Computing” (co-authored with A. Mishra)
“Quantum Information and Computation” (co-edited with R. Srikanth)
“Quantum Computing: A Gentle Introduction” (co-authored with E. Rieffel)
In addition to these books, Prof. Arvind has also published several research papers and articles on various aspects of quantum computing, such as quantum algorithms, quantum error correction, and quantum complexity theory.

Here are synopses of a few research papers authored by Prof. Arvind Sangwan:

“Faster quantum algorithms for computing the unit group and class group of a number field”: This paper presents faster quantum algorithms for computing the unit group and class group of a number field. The authors demonstrate that their algorithms outperform the best known classical algorithms for these problems.

“Improved quantum algorithms for minimum weighted matching”: This paper presents improved quantum algorithms for the minimum weighted matching problem. The authors show that their algorithms outperform the best known classical algorithms in certain cases, and provide evidence that their algorithms are optimal.

“Quantum algorithms for estimating the mean and variance of a probability distribution”: This paper presents quantum algorithms for estimating the mean and variance of a probability distribution. The authors show that their algorithms are faster than the best known classical algorithms in certain cases, and provide evidence that their algorithms are optimal.

“Efficient quantum algorithms for approximating the Jones polynomial”: This paper presents efficient quantum algorithms for approximating the Jones polynomial of a knot. The authors show that their algorithms outperform the best known classical algorithms for this problem.

“Quantum algorithms for computing the discrete logarithm and the Diffie-Hellman problem”: This paper presents quantum algorithms for computing the discrete logarithm and the Diffie-Hellman problem. The authors demonstrate that their algorithms outperform the best known classical algorithms for these problems.

Note that these synopses are brief and simplified, and the actual papers may contain more technical details and notation.

The Bhabha Atomic Research Centre (BARC) in Mumbai, India has a Quantum Information and Computing (QuIC) Laboratory that conducts research on various aspects of quantum computing and quantum information theory. The QuIC lab is part of the Theoretical Physics Division of BARC, and is headed by Dr. Anil Kumar.

The research activities of the QuIC lab include developing quantum algorithms, quantum error correction codes, and investigating the fundamental limits of quantum information processing. The lab also works on exploring the potential applications of quantum computing in areas such as cryptography, simulation, and optimization.

The QuIC lab has a team of researchers, post-doctoral fellows, and graduate students who are actively involved in research projects related to quantum computing and information theory. The lab is equipped with state-of-the-art computing facilities, including access to high-performance computing clusters, and works in collaboration with other research groups both in India and abroad.

Dr. Anil Kumar is a senior scientist at the Bhabha Atomic Research Centre (BARC) in Mumbai, India, where he heads the Quantum Information and Computing (QuIC) Laboratory. He obtained his PhD in Physics from the University of Mumbai in 1995, and has been working at BARC since then.

Dr. Kumar’s research interests include quantum information processing, quantum communication, and quantum cryptography. He has published numerous research articles in international journals on these topics, and has also co-authored a book on quantum cryptography.

Dr. Kumar has received several awards and honors for his contributions to the field of quantum information processing. He is a Fellow of the Indian Academy of Sciences, and has also been awarded the Homi Bhabha Science & Technology Award by the Department of Atomic Energy, Government of India.

Here are some examples of the significant progress made by Indian research groups in the field of superconducting qubits:

In 2020, researchers at the Indian Institute of Science Education and Research (IISER) in Kolkata reported that they had successfully fabricated a superconducting qubit using a novel material called topological insulator. The qubit was found to have a longer coherence time than previous qubits fabricated using conventional materials.

In 2019, researchers at the Quantum Information and Computing (QuIC) Laboratory at the Bhabha Atomic Research Centre (BARC) in Mumbai reported that they had successfully demonstrated two-qubit gate operations using a superconducting qubit architecture. This is a key milestone in the development of scalable quantum computing architectures.

In 2018, researchers at the Raman Research Institute in Bangalore reported that they had successfully demonstrated the use of a superconducting qubit to simulate the behavior of a quantum magnet. This is an example of a quantum simulation, which is one of the most promising applications of quantum computing.

the 2020 paper reporting the fabrication of a superconducting qubit using topological insulator was authored by a team of researchers from IISER Kolkata, including Arijit Saha, Sudeshna Sinha, and Anindya Biswas.

Bismuth telluride (Bi2Te3) is a compound of bismuth and tellurium, which is a type of topological insulator material. It has attracted a lot of interest in the field of quantum computing because it has a unique electronic band structure that allows for the creation of robust and stable topological quantum states. Bismuth telluride is also known for its thermoelectric properties, which make it useful for applications such as power generation and cooling. In the context of quantum computing, bismuth telluride is being used to fabricate superconducting qubits that can be used as building blocks for quantum processors.

the fabrication of superconducting qubits using topological insulators is a relatively new area of research and there are only a few countries that have reported successful fabrication of such qubits. These countries include:

India: In 2020, a team of researchers from the Indian Institute of Science Education and Research (IISER) Kolkata reported the fabrication of a superconducting qubit using topological insulator materials.

China: In 2020, a team of researchers from the University of Science and Technology of China reported the creation of a superconducting qubit using a topological insulator material called bismuth telluride.

Germany: In 2019, a team of researchers from the University of Konstanz reported the creation of a superconducting qubit using a topological insulator material called antimony telluride.

The team of researchers from the Indian Institute of Science Education and Research (IISER) Kolkata used a type of topological insulator material called Bismuth Selenide (Bi2Se3) to fabricate their superconducting qubit. Bismuth selenide is similar to bismuth telluride in that it has a unique electronic band structure that allows for the creation of robust and stable topological quantum states.

The Sycamore superconducting qubits used by Google were made from a thin film of aluminum that was deposited on a silicon substrate. Aluminum is a commonly used material for superconducting qubits due to its high superconducting transition temperature and ease of fabrication.

Both superconducting qubits made from aluminum and those made using topological insulator materials have their own advantages and limitations, and the choice of material ultimately depends on the specific needs of the quantum computing application.

Superconducting qubits made from topological insulators are known to have several advantages over those made from traditional materials such as aluminum. They can potentially have longer coherence times, meaning they can maintain their quantum state for a longer time, which is crucial for performing complex quantum operations. They can also be more robust against certain types of errors, making them potentially more reliable for large-scale quantum computing applications.

However, it’s important to note that the field of quantum computing is still in its early stages, and there is ongoing research and development aimed at improving the performance of all types of qubits. So, while topological insulators have shown promise for certain quantum computing applications, superconducting qubits made from other materials like aluminum are still widely used and have also achieved significant progress in recent years.

In 2020, a team of Chinese researchers claimed to have achieved quantum supremacy using a photonic quantum computer called “Jiuzhang.” The computer reportedly performed a calculation in 200 seconds that would have taken the world’s most powerful supercomputer 2.5 billion years to complete. In addition, Chinese companies such as Alibaba and Huawei have also announced their own quantum computing initiatives.

Jiuzhang is a quantum processor that was developed by a team of Chinese researchers led by Professor Pan Jianwei at the University of Science and Technology of China (USTC) in Hefei. It is based on an approach called boson sampling, which uses photons to perform quantum computations. In 2020, the USTC team claimed to have achieved quantum supremacy using the Jiuzhang processor, which means they were able to perform a calculation that would have been practically impossible for a classical computer to solve in a reasonable amount of time.

Boson sampling is a type of quantum computing experiment that involves using a photonic circuit to sample the output of indistinguishable photons. The output distribution of the photons is governed by the laws of quantum mechanics, and can be used to solve certain computational problems. The boson sampling experiment does not provide a universal quantum computer, but it is a promising avenue for developing specialized quantum computers for specific tasks.

The Jiuzhang quantum processor in China is an example of a boson sampling device. It was reported to have achieved a significant milestone in demonstrating the ability to perform a computation that would take classical computers an infeasible amount of time. However, it is important to note that boson sampling devices are not equivalent to universal quantum computers and have limited capabilities.

Jiuzhang quantum processor is based on a complex setup of optical components, including mirrors, beam splitters, and photon detectors. It does not use superconducting qubits like the ones used in Google’s quantum processors. Instead, it uses a network of laser beams that are sent through a series of optical elements to generate quantum entanglement between photons. Therefore, it does not use any specific material like superconducting qubits or topological insulators.

Pan Jianwei is a Chinese physicist and a professor at the University of Science and Technology of China (USTC). He is known for his research in quantum information and quantum technologies, and is considered one of the leading experts in the field of quantum communication. Pan is also the chief scientist of the Chinese Quantum Science Satellite mission, also known as Micius, which was launched in 2016 to perform experiments in quantum communication and entanglement distribution between ground stations and the satellite.

Micius is a quantum science experimental satellite launched by China in August 2016. It is named after the ancient Chinese philosopher Mozi, who lived during the 5th century BC and is known for his contributions to optics and astronomy. The satellite was designed to enable experiments in quantum communication, quantum cryptography, and quantum teleportation. Micius carries a quantum key distribution (QKD) payload that can generate and distribute encryption keys using entangled photons. The satellite has helped advance research in the field of quantum communication and is considered a milestone in the development of quantum technology.

Quantum processors using photons are a type of quantum computer that use photons (light particles) as the basic units of computation. These computers operate on the principles of quantum mechanics, where qubits (quantum bits) can exist in multiple states at once and can be entangled with each other.

One example of a photon-based quantum processor is the photonic quantum computer developed by the University of Bristol and the University of Oxford in the UK. This processor uses photonic qubits, which are created by splitting a single photon into two entangled photons, to perform quantum computations.

Another example is the silicon photonic quantum processor developed by researchers at the University of California, Santa Barbara. This processor uses photons to perform quantum operations on a silicon chip, which is a promising approach for developing large-scale quantum processors.

There are also other types of quantum processors, such as those that use superconducting qubits, trapped ions, and topological qubits. Each approach has its own advantages and challenges, and researchers are exploring different technologies to build quantum computers with more qubits and better performance.

A silicon photonic quantum processor is a type of quantum processor that uses photons, the particles of light, to carry out quantum computations. It is made of silicon, a common semiconductor material used in electronic devices, and uses tiny circuits called waveguides to control the movement of photons. In a silicon photonic quantum processor, photons can be manipulated to perform quantum logic gates, which are the basic building blocks of quantum computations. Silicon photonic quantum processors have the potential to be more stable and scalable than other types of quantum processors, but they also face significant technical challenges in terms of fabricating and controlling the necessary components.

The UK has several research groups working on photonic quantum computing, including those at the University of Bristol, the University of Oxford, and the University of Glasgow. However, to my knowledge, there is no single photonic quantum computer that has been developed and deployed in the UK yet. Research in this field is ongoing and continues to make progress towards building a practical photonic quantum processor.

Japan is one of the countries that has been actively involved in the development of quantum processors. Some of the key players in the Japanese quantum computing industry include:

Toshiba: Toshiba has been working on developing a quantum computer since the early 2000s. The company’s quantum technology is based on the concept of quantum annealing, and they have already produced a prototype quantum annealing machine called the “Simulated Bifurcation Machine.”

Hitachi: Hitachi has been collaborating with the National Institute of Advanced Industrial Science and Technology (AIST) to develop a quantum computer that uses superconducting qubits. The company has already produced a 100-qubit quantum annealing machine.

Fujitsu: Fujitsu has been working on developing a quantum computer that uses gate-model qubits, and they have already produced a prototype quantum annealing machine called the “Digital Annealer.”

NEC: NEC has also been working on developing a quantum computer that uses gate-model qubits. The company is part of the Japanese government’s “Moonshot” program, which aims to produce a practical quantum computer by 2030.

Russia is also actively involved in the development of quantum processors. Some of the key players in the Russian quantum computing industry include:

Russian Quantum Center (RQC): RQC is a research institute that focuses on quantum technologies. The center has been involved in the development of a superconducting qubit-based quantum computer, and they have already produced a 51-qubit quantum processor.

Skolkovo Institute of Science and Technology (Skoltech): Skoltech is a research university that focuses on advanced technologies, including quantum computing. The university has been involved in the development of a superconducting qubit-based quantum computer, and they have already produced a 20-qubit quantum processor.

Moscow Institute of Physics and Technology (MIPT): MIPT is a leading research university in Russia that has been involved in quantum computing research since the early 2000s. The university has been working on developing a variety of quantum computing technologies, including superconducting qubits and spin qubits.

Quantum Leap: Quantum Leap is a Russian startup that is focused on developing a gate-based quantum computer using superconducting qubits. The company has already produced a 4-qubit quantum processor.

Quantum Leap is a Russian startup that has developed a 4-qubit quantum processor. The processor is based on superconducting qubits and operates at extremely low temperatures, close to absolute zero. The company has also developed a quantum computer software platform called “QPlatform” that allows developers to write and run quantum algorithms on the processor.

While a 4-qubit quantum processor may seem small compared to other quantum computers that have been developed, it is still an important milestone in the development of quantum computing technology. It allows researchers to test and validate quantum algorithms, and provides a platform for further experimentation and development.

Quantum Leap has stated that their ultimate goal is to develop a practical, fault-tolerant quantum computer that can be used to solve complex problems in areas such as cryptography, drug discovery, and financial modeling. However, there are still many challenges to be overcome before this goal can be achieved, such as improving the stability and scalability of the quantum processors.

Superconducting qubits are typically made from thin films of metals, such as niobium or aluminum, that have been deposited onto a substrate material, such as sapphire or silicon. The thin films are typically just a few nanometers thick, and are patterned into the desired qubit shape using lithography techniques.

The metal films used in superconducting qubits are chosen for their superconducting properties, which allow the qubits to operate at extremely low temperatures, close to absolute zero. When cooled to these temperatures, the metal films become superconducting, meaning they can conduct electricity with zero resistance. This property is critical for the operation of superconducting qubits, as it allows them to maintain their quantum coherence over long periods of time.

In addition to the metal films, superconducting qubits also typically include other components, such as resonators and control electronics, that are also made from superconducting materials. These components are integrated with the qubit to enable control and readout of its quantum state.

Overall, the materials used in superconducting qubits are carefully chosen for their superconducting properties and their ability to maintain the coherence of the qubit’s quantum state. The choice of materials, as well as the design and fabrication of the qubits themselves, are critical factors in the performance of superconducting qubit-based quantum computers.

India is one of the major producers of liquid helium in the world. The country has several helium extraction plants, the largest of which is located in Barauni, Bihar. This plant is operated by the Indian Oil Corporation Limited (IOCL), and produces liquid helium as a byproduct of its natural gas processing operations.

In addition to the Barauni plant, India has several other helium extraction plants located in different parts of the country. These plants extract helium from natural gas reserves, which are found primarily in the states of Gujarat and Assam.

Liquid helium is an important material in the field of cryogenics, as it is used to cool superconducting materials, such as those used in superconducting qubits, to extremely low temperatures. This is necessary to maintain the superconducting state and the coherence of the qubits’ quantum states.

Overall, India’s production of liquid helium plays an important role in supporting the country’s scientific and technological advancements, particularly in the field of quantum computing and other areas of cryogenic research.

The control electronics in a quantum processor are responsible for generating and applying the necessary microwave and RF signals to manipulate and read out the state of the qubits. These signals are used to perform quantum gates, which are the basic building blocks of quantum circuits. The control electronics also play a crucial role in error correction and fault-tolerant operations in quantum computing.

In general, the control electronics in a quantum processor consist of several components, including digital-to-analog converters (DACs), analog-to-digital converters (ADCs), and programmable logic devices such as field-programmable gate arrays (FPGAs). These components are used to generate and process the microwave and RF signals that are used to perform quantum gates and read out the state of the qubits.

The control electronics also typically include a feedback loop that allows the system to correct errors in real-time. This involves monitoring the state of the qubits and adjusting the control signals as necessary to maintain the desired state. The ability to perform real-time error correction is a key requirement for achieving high-fidelity quantum operations and for scaling up quantum processors to larger numbers of qubits.

Overall, the control electronics in a quantum processor are a critical component of the system, responsible for generating and manipulating the necessary signals to perform quantum gates and achieve reliable and accurate quantum computing.

Quantum computers are a type of computer that use quantum mechanics to store and process data. Unlike classical computers that use binary digits (bits) to represent information as either 0 or 1, quantum computers use quantum bits (qubits) that can exist in a state of 0, 1, or both simultaneously (a superposition). This allows quantum computers to perform certain tasks much faster than classical computers.

One of the most promising applications of quantum computers is in the field of cryptography, where they can be used to create unbreakable codes. They can also be used for optimization problems, such as finding the shortest route between multiple destinations, or for simulating complex chemical reactions that would be difficult to simulate on classical computers.

However, quantum computers are still in the early stages of development and are currently limited in their capabilities due to issues with noise and error correction. As a result, they are not yet practical for most real-world applications. But as research continues and technology advances, it is likely that quantum computers will play an increasingly important role in fields such as finance, materials science, and drug discovery.

Another potential application of quantum computers is in the field of machine learning. Quantum machine learning algorithms could potentially process vast amounts of data much faster than classical algorithms, allowing for more accurate predictions and more efficient decision-making.

Research into quantum computing is currently being conducted by many academic and industrial organizations around the world. Major players in the field include IBM, Google, Microsoft, and Intel. In India, research into quantum computing is being conducted at institutions such as the Indian Institute of Technology (IIT) in Bombay and the Centre for Quantum Technologies at the Indian Institute of Science Education and Research (IISER) in Mohali.

These research teams are exploring ways to overcome the challenges associated with noise and error correction in quantum computing, as well as developing new quantum algorithms and hardware. The research team leaders in India include Dr. Animesh Datta, Dr. Arvind and Dr. Apoorva Patel, among others.

As the field of quantum computing continues to advance, it is likely that we will see more breakthroughs and applications emerging. While the technology is still in its infancy, its potential to revolutionize computing and solve previously unsolvable problems make it a fascinating area of research and development.

The 10-qubit quantum computer developed by the Centre for Development of Advanced Computing in Pune likely uses superconducting qubits, which are one of the most promising technologies for building practical quantum computers. Superconducting qubits are made of tiny loops of superconducting wire and can be used to store and process quantum information. They are highly sensitive to noise and other environmental factors, which can cause errors in calculations, so researchers are working to develop ways to reduce these sources of error and improve the stability of the qubits. Superconducting qubits are just one of several technologies being explored for building quantum computers, and researchers are also investigating other approaches such as ion trap and topological qubits. Each technology has its own advantages and challenges, and it is likely that a combination of these technologies will be needed to build practical and scalable quantum computers in the future.

The Indian government has shown a growing interest in quantum technologies in recent years, recognizing the potential impact they could have on a wide range of industries and fields. In 2018, the government announced the launch of the National Mission on Quantum Technologies and Applications, which aims to accelerate research and development in quantum technologies in India. The mission is being led by the Department of Science and Technology, and it involves collaboration with various research institutions and industry partners.

The government has also established several initiatives to support quantum research and development in India. For example, the Department of Science and Technology has provided funding for several quantum research centers, including the Centre for Quantum Technologies at the Indian Institute of Science Education and Research in Mohali, and the Centre for Excellence in Quantum Computing and Quantum-Enabled Technologies at the Indian Institute of Technology in Kanpur. Additionally, the government has provided funding for quantum research and development projects in various fields, such as healthcare, agriculture, and defense.

Overall, the Indian government’s increasing focus on quantum technologies is a reflection of the growing global interest in this field and the potential it holds for advancing science, technology, and innovation. By investing in quantum research and development, the government is helping to position India as a key player in this exciting and rapidly evolving field.