On quantum key distribution in decoherence-free subspace

Details On quantum key distribution in decoherence-free subspace On quantum key distribution in decoherence-free subspace

2003-08-18

arxiv.org/abs/quant-ph/0308092v4

Physics

Quantum Physics

5 pages, 3 figure

Scientific paper

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.

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