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Proceedings Paper

The role of quantum memory in quantum information processing
Author(s): Kae Nemoto; Ashley M. Stephens; Simon J. Devitt; Keith A. Harrison; William J. Munro
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Paper 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.

Paper Details

Date Published: 26 September 2013
PDF: 7 pages
Proc. SPIE 8875, Quantum Communications and Quantum Imaging XI, 88750J (26 September 2013); doi: 10.1117/12.2023814
Show Author Affiliations
Kae Nemoto, National Institute of Informatics (Japan)
Ashley M. Stephens, National Institute of Informatics (Japan)
Simon J. Devitt, National Institute of Informatics (Japan)
Keith A. Harrison, Kismet Institute (United Kingdom)
National Institute of Informatics (Japan)
William J. Munro, NTT Basic Research Labs. (Japan)
National Institute of Informatics (Japan)

Published in SPIE Proceedings Vol. 8875:
Quantum Communications and Quantum Imaging XI
Ronald E. Meyers; Yanhua Shih; Keith S. Deacon, Editor(s)

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