Faithful qubit distribution assisted by one additional qubit against collective noise

T. Yamamoto, J. Shimamura, Ş K. Özdemir, M. Koashi, N. Imoto

Research output: Contribution to journalArticle

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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.

Original languageEnglish (US)
Article number040503
JournalPhysical Review Letters
Issue number4
StatePublished - Jul 22 2005


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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