Faithful qubit distribution assisted by one additional qubit against collective noise

Details Faithful qubit distribution assisted by one additional qubit against collective noise Faithful qubit distribution assisted by one additional qubit against collective noise

2004-07-06

arxiv.org/abs/quant-ph/0407046v2

Phys. Rev. Lett. 95, 040503 (2005)

Physics

Quantum Physics

4 pages, 3 figures; published version in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.040503

We propose a distribution scheme of polarization states of a single photon over 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 post-selection. While the scheme succeeds only probabilistically, it is simpler and more flexible than the schemes utilizing decoherence-free subspace. An application to BB84 protocol through collective noise channel, which is robust to the Trojan horse attack, is also given.

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