Quantum adaptation of noisy channels

Details Quantum adaptation of noisy channels Quantum adaptation of noisy channels

2009-05-06

arxiv.org/abs/0905.0862v1

Phys. Rev. A 78, 052322 (2008)

Physics

Quantum Physics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevA.78.052322

Probabilistic quantum filtering is proposed to properly adapt sequential independent quantum channels in order to stop sudden death of entanglement. In the adaptation, the quantum filtering does not distill or purify more entanglement, it rather properly prepares entangled state to the subsequent quantum channel. For example, the quantum adaptation probabilistically eliminates the sudden death of entanglement of two-qubit entangled state with isotropic noise injected into separate amplitude damping channels. The result has a direct application in quantum key distribution through noisy channels.

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