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Conference on Lasers and Electro-Optics

A distribution scheme for qubit over collective-noise channel

Takashi Yamamoto, Junichi Shimamura, Ryoji Nagase, Şahin Kaya Özdemir, Masato Koashi, N. Imoto

Published Jan 1, 2005• 0 citations
Publisher
DOI
10.1109/iqec.2005.1561033

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•Jan 1, 2004•0 citations
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.
We propose a distribution scheme of polarization states of a single photon over collective-noise channel assisted with one additional photon in a fixed polarization state. Although the present scheme does not encode the polarization state of a photon to an entangled state of two photons in the decoherence-free subspace, the state is protected against collective noise and extracted by a measurement based on the parity check and the post-selection. This scheme will easily be applied to many quantum communication protocols based on qubits.