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Proceedings Paper

Optical quantum information processing utilizing weak nonlinearities: a little goes a long way
Author(s): W. J. Munro; K. Nemoto; T. P. Spiller; R. G. Beausoleil; P. Kok; S. D. Barrett
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Paper Abstract

Processing information quantum mechanically is known to enable new communication and computational scenarios that cannot be accessed with conventional information technology (IT). It is known that such quantum processing can be performed with linear optical techniques, measurement and feed-forward. However, here the gates are intrinsically probabilistic and so scaling up such an approach requires considerable qubit resources. Here we present an alternative approach to optical QIP, based on the use of weak cross-Kerr non-linearities and highly efficient homodyne measurements. This approach enables a parity gate between optical qubits, mediated by an additional optical probe mode, enabling near-deterministic Bell state measurement and entangling gates. Our approach is therefore the basis for very efficient, scalable optical QIP, and provides a natural method for distributing such processing, combining it with quantum communication.

Paper Details

Date Published: 25 August 2005
PDF: 10 pages
Proc. SPIE 5893, Quantum Communications and Quantum Imaging III, 58930I (25 August 2005); doi: 10.1117/12.613614
Show Author Affiliations
W. J. Munro, Hewlett-Packard Labs. (United Kingdom)
National Institute of Informatics (Japan)
K. Nemoto, National Institute of Informatics (Japan)
T. P. Spiller, Hewlett-Packard Labs. (United Kingdom)
R. G. Beausoleil, Hewlett-Packard Labs. (United States)
P. Kok, Hewlett-Packard Labs. (United Kingdom)
S. D. Barrett, Hewlett-Packard Labs. (United Kingdom)

Published in SPIE Proceedings Vol. 5893:
Quantum Communications and Quantum Imaging III
Ronald E. Meyers; Yanhua Shih, Editor(s)

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