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Phys. Rev. A 67, 040304(R) (2003) [4 pages]

Input states for quantum gates

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A. Gilchrist1,*, W. J. Munro2, and A. G. White1
1Center for Quantum Computer Technology and Department of Physics, University of Queensland, QLD 4072, Brisbane, Australia
2Hewlett-Packard Laboratories, Filton Road, Stoke Gifford, Bristol, BS34 8QZ, United Kingdom

Received 15 January 2003; published 22 April 2003

We examine three possible implementations of nondeterministic linear optical controlled NOT gates with a view to an in-principle demonstration in the near future. To this end we consider demonstrating the gates using currently available sources, such as spontaneous parametric down conversion and coherent states, and current detectors only able to distinguish between zero and many photons. The demonstration is possible in the coincidence basis and the errors introduced by the nonoptimal input states and detectors are analyzed.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.040304
DOI:
10.1103/PhysRevA.67.040304
PACS:
03.67.Lx, 42.50.-p

*Electronic address: alexei@physics.uq.edu.au

 
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