Tight bound on coherent-state-based entanglement generation over lossy channels

Details Tight bound on coherent-state-based entanglement generation over lossy channels Tight bound on coherent-state-based entanglement generation over lossy channels

2009-08-19

arxiv.org/abs/0908.2735v1

Physics

Quantum Physics

12 pages, 3 figures

Scientific paper

The first stage of the hybrid quantum repeaters is entanglement generation based on transmission of pulses in coherent states over a lossy channel. Protocols to make entanglement with only one type of error are favorable for rendering subsequent entanglement distillation efficient. Here we provide the tight upper bound on performances of these protocols that is determined only by the channel loss. In addition, we show that this bound is achievable by utilizing a proposed protocol [arXiv:0811.3100] composed of a simple combination of linear optical elements and photon-number-resolving detectors.

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