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APS » Journals » Phys. Rev. Lett. » Volume 88 » Issue 18
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Phys. Rev. Lett. 88, 187902 (2002) [4 pages]

Multiphoton Entanglement Concentration and Quantum Cryptography

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Gabriel A. Durkin1, Christoph Simon1, and Dik Bouwmeester1,2
1Centre for Quantum Computation, University of Oxford, Oxford OX1 3PU, United Kingdom
2Department of Physics, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106

Received 25 September 2001; published 17 April 2002

Multiphoton states from parametric down-conversion can be entangled both in polarization and photon number. Maximal high-dimensional entanglement can be concentrated postselectively from these states via photon counting. This makes them natural candidates for quantum key distribution, where the presence of more than one photon per detection interval has up to now been considered undesirable. We propose a simple multiphoton cryptography protocol for the case of low losses.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.187902
DOI:
10.1103/PhysRevLett.88.187902
PACS:
03.67.Dd, 03.65.Ud
 
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