Robustness of quantum communication based on a decoherence-free subspace using a counter-propagating weak coherent light pulse

Abstract

We study distribution schemes for a polarization entangled photon pair based on a decoherence-free subspace over lossy quantum channels and propose an efficient scheme that is robust against not only collective phase noises but also general collective noises for two qubits. While the proposed scheme employs two photons to build the decoherence-free subspace, the success probability is proportional to the channel transmittance of a single photon with the aid of a counter-propagating weak coherent light pulse. The key ingredient in the scheme is found to be the reciprocity of the channel. The proposed scheme shares the rest of the properties with the previously proposed schemes, i.e., it can be realized by linear optical elements and it is robust against the fluctuations in the optical circuits used by the two parties.

9 pages, 8 figures

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Cited by in corpus (6)

• Blind quantum computation with noise environment
• Blind quantum computation over a collective-noise channel
• Quantum key distribution based on orthogonal state encoding
• Extracting an entangled photon pair from collectively decohered pairs at a telecommunication wavelength
• Experimental demonstration of robust entanglement distribution over reciprocal noisy channels assisted by a counter-propagating classical reference light
• Robust entanglement distribution via telecom fibre assisted by an asynchronous counter-propagating laser light