**Todd A. Brun** is an American engineer and physicist, currently a professor at University of Southern California. He is a Fellow of the American Physical Society for "contributions to quantum theory and quantum information science, including decoherence and continuous quantum measurement, quantum computation, and quantum error correction."^{ [1] }^{ [2] }^{ [3] } He is a coinventor of the method of entanglement-assisted quantum error correction,^{ [4] } which allows for the use of shared entanglement in quantum error correction and for producing a quantum error correction code from an arbitrary classical error correction code.

This is a **timeline of quantum computing**.

**Quantum information science** is a field that combines the principles of quantum mechanics with information theory to study the processing, analysis, and transmission of information. It covers both theoretical and experimental aspects of quantum physics, including the limits of what can be achieved with quantum information. The term **quantum information theory** is sometimes used, but it does not include experimental research and can be confused with a subfield of quantum information science that deals with the processing of quantum information.

**Quantum error correction** (**QEC**) is used in quantum computing to protect quantum information from errors due to decoherence and other quantum noise. Quantum error correction is theorised as essential to achieve fault tolerant quantum computing that can reduce the effects of noise on stored quantum information, faulty quantum gates, faulty quantum preparation, and faulty measurements. This would allow algorithms of greater circuit depth.

**Gilles Brassard**, is a faculty member of the Université de Montréal, where he has been a Full Professor since 1988 and Canada Research Chair since 2001.

**Quantum networks** form an important element of quantum computing and quantum communication systems. Quantum networks facilitate the transmission of information in the form of quantum bits, also called qubits, between physically separated quantum processors. A quantum processor is a small quantum computer being able to perform quantum logic gates on a certain number of qubits. Quantum networks work in a similar way to classical networks. The main difference is that quantum networking, like quantum computing, is better at solving certain problems, such as modeling quantum systems.

**William "Bill" Kent Wootters** is an American theoretical physicist, and one of the founders of the field of quantum information theory. In a 1982 joint paper with Wojciech H. Zurek, Wootters proved the no cloning theorem, at the same time as Dennis Dieks, and independently of James L. Park who had formulated the no-cloning theorem in 1970. He is known for his contributions to the theory of quantum entanglement including quantitative measures of it, entanglement-assisted communication and entanglement distillation. The term *qubit,* denoting the basic unit of quantum information, originated in a conversation between Wootters and Benjamin Schumacher in 1992.

**Daniel Amihud Lidar** is the holder of the Viterbi Professorship of Engineering at the University of Southern California, where he is a professor of electrical engineering, chemistry, physics and astronomy. He is the director and co-founder of the USC Center for Quantum Information Science & Technology (CQIST) as well as scientific director of the USC-Lockheed Martin Quantum Computing Center, notable for his research on control of quantum systems and quantum information processing.

**Gil Kalai** is an Israeli mathematician and computer scientist. He is the Henry and Manya Noskwith Professor Emeritus of Mathematics at the Hebrew University of Jerusalem, Israel, Professor of Computer Science at the Interdisciplinary Center, Herzliya, and adjunct Professor of mathematics and of computer science at Yale University, United States.

**Raymond Laflamme**, OC, FRSC is a Canadian theoretical physicist and founder and until mid 2017, was the director of the Institute for Quantum Computing at the University of Waterloo. He is also a professor in the Department of Physics and Astronomy at the University of Waterloo and an associate faculty member at Perimeter Institute for Theoretical Physics. Laflamme is currently a Canada Research Chair in Quantum Information. In December 2017, he was named as one of the appointees to the Order of Canada.

**Entanglement distillation** is the transformation of *N* copies of an arbitrary entangled state into some number of approximately pure Bell pairs, using only local operations and classical communication.

**John A. Smolin** is an American physicist and Fellow of the American Physical Society at IBM's Thomas J. Watson Research Center.

In the theory of quantum communication, the **entanglement-assisted stabilizer formalism** is a method for protecting quantum information with the help of entanglement shared between a sender and receiver before they transmit quantum data over a quantum communication channel. It extends the standard stabilizer formalism by including shared entanglement . The advantage of entanglement-assisted stabilizer codes is that the sender can exploit the error-correcting properties of an arbitrary set of Pauli operators. The sender's Pauli operators do not necessarily have to form an Abelian subgroup of the Pauli group over qubits. The sender can make clever use of her shared ebits so that the global stabilizer is Abelian and thus forms a valid quantum error-correcting code.

Quantum block codes are useful in quantum computing and in quantum communications. The encoding circuit for a large block code typically has a high complexity although those for modern codes do have lower complexity.

In quantum mechanics, the **cat state**, named after Schrödinger's cat, is a quantum state composed of two diametrically opposed conditions *at the same time*, such as the possibilities that a cat is alive and dead at the same time.

**Barbara M. Terhal** is a theoretical physicist working in quantum information and quantum computing. She is a professor in the Delft Institute of Applied Mathematics at TU Delft, as well as leading the Terhal Group at QuTech, the Dutch institute for quantum computing and quantum internet, founded by TU Delft and the Netherlands Organisation for Applied Scientific Research (TNO). Her research concerns many areas in quantum information theory, including entanglement detection, quantum error correction, fault-tolerant quantum computing and quantum memories.

In quantum computing, a *qubit* is a unit of information analogous to a bit in classical computing, but it is affected by quantum mechanical properties such as superposition and entanglement which allow qubits to be in some ways more powerful than classical bits for some tasks. Qubits are used in quantum circuits and quantum algorithms composed of quantum logic gates to solve computational problems, where they are used for input/output and intermediate computations.

**Eric Michael Rains** is an American mathematician specializing in coding theory and special functions, especially applications from and to noncommutative algebraic geometry.

**Mark McMahon Wilde** is an American quantum information scientist. He is an Associate Professor in the School of Electrical and Computer Engineering at Cornell University, and he is also a Fields Member in the School of Applied and Engineering Physics and the Department of Computer Science at Cornell.

**Bei Zeng** is a quantum information theorist at the Hong Kong University of Science and Technology, where she is a professor of physics, and director of the IAS Center for Quantum Technologies. As well as quantum information, her research interests include quantum computing and quantum error correction.

This **glossary of quantum computing** is a list of definitions of terms and concepts used in quantum computing, its sub-disciplines, and related fields.

- ↑ "Fellows". aps.org. Retrieved January 18, 2021.
- ↑ "Todd Brun". usc.edu. Retrieved April 20, 2017.
- ↑ "Todd A. Brun" . Retrieved April 20, 2017.
- ↑ Brun, T.; Devetak, I.; Hsieh, M.-H. (2006-10-20). "Correcting Quantum Errors with Entanglement".
*Science*. American Association for the Advancement of Science (AAAS).**314**(5798): 436–439. arXiv: quant-ph/0610092 . Bibcode:2006Sci...314..436B. doi:10.1126/science.1131563. ISSN 0036-8075. PMID 17008489. S2CID 18106089.

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