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Phys. Rev. Lett. 95, 040503 (2005) [4 pages]

Faithful Qubit Distribution Assisted by One Additional Qubit against Collective Noise

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T. Yamamoto1,2,*, J. Shimamura1,2,3, Ş. K. Özdemir1,2,3, M. Koashi1,2,3, and N. Imoto1,2,3
1Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
2CREST Research Team for Photonic Quantum Information, 4-1-8 Honmachi, Kawaguchi, Saitama 331-0012, Japan
3SORST Research Team for Interacting Carrier Electronics, 4-1-8 Honmachi, Kawaguchi, Saitama 331-0012, Japan

Received 13 July 2004; revised 15 April 2005; published 22 July 2005

We propose a distribution scheme of polarization states of a single photon over a collective-noise channel. By adding one extra photon with a fixed polarization, we can protect the state against collective noise via a parity-check measurement and postselection. While the scheme succeeds only probabilistically, it is simpler and more flexible than the schemes utilizing decoherence-free subspace. An application to the Bennett-Brassard 1984 protocol through a collective-noise channel, which is robust to the Trojan horse attack, is also given.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.040503
DOI:
10.1103/PhysRevLett.95.040503
PACS:
03.67.Pp, 03.67.Dd, 03.67.Hk

*Electronic address: yamamoto@mp.es.osaka-u.ac.jp

 
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