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On quantum key distribution in decoherence-free subspace

We propose easy implementable protocols for robust quantum key distribution with the collective dephasing channel or collective rotating channel. In these protocols, Bob only takes passive photon detection to measure the polarization qubits in the random bases. The source for the protocol with collective rotating channel is made by type 2 spontaneous parametric down conversion with random unitary rotation and phase shifter, no quantum disentangler is required. A simple proof for unconditionally security is shown.

preprint2003arXivOpen access
Xiang-Bin Wang
quant-ph
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Open access1 author1 topic
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Xiang-Bin Wang

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