The role of quantum memory in quantum information processing

Kae Nemoto; Ashley M. Stephens; Simon J. Devitt; Keith A. Harrison; William J. Munro

doi:10.1117/12.2023814

26 September 2013 The role of quantum memory in quantum information processing

Kae Nemoto, Ashley M. Stephens, Simon J. Devitt, Keith A. Harrison, William J. Munro

Proceedings Volume 8875, Quantum Communications and Quantum Imaging XI; 88750J (2013) https://doi.org/10.1117/12.2023814
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Until recently, it was believed that long-lived quantum memories were necessary for long-distance quantum communication. However, by using error-correction codes in an efficient way—specifically, by correcting for photon loss—it is possible to transmit quantum information over long distances without quantum memories. For quantum computation, recent architectures for topological quantum computation indicate that the simplest large-scale structure could be memory-less. While a quantum memory may no longer be an essential resource for quantum networks, it could nonetheless be a key device in the development of quantum information technology. However, it is still not clear what benefits a functioning device could bring to quantum information systems, largely due to a lack of detailed models. Recently we have developed a detailed model for a quantum network based on a simple device designed to act as a building block for a full system architecture. The device is based on an optical cavity containing a negatively charged nitrogen-vacancy center in diamond. This model naturally integrates quantum communication with computation, and using this model we can assess quantitatively the costs and benefits of quantum memories. With or without quantum memories, it is necessary for us to preserve quantum information for a long period of time in either communication or computation.

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Kae Nemoto, Ashley M. Stephens, Simon J. Devitt, Keith A. Harrison, and William J. Munro "The role of quantum memory in quantum information processing", Proc. SPIE 8875, Quantum Communications and Quantum Imaging XI, 88750J (26 September 2013); https://doi.org/10.1117/12.2023814

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KEYWORDS

Quantum memory

Quantum communications

Quantum information

Signal processing

Quantum computing

Receivers

Data processing

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