Optimal entanglement manipulation via coherent-state transmission

Details Optimal entanglement manipulation via coherent-state transmission Optimal entanglement manipulation via coherent-state transmission

2011-08-13

arxiv.org/abs/1108.2747v1

Physics

Quantum Physics

5 pages, 1 figure

Scientific paper

We derive an optimal bound for arbitrary entanglement manipulation based on the transmission of a pulse in coherent states over a lossy channel followed by local operations and unlimited classical communication (LOCC). This stands on a theorem to reduce LOCC via a local unital qubit channel to local filtering. We also present an optimal protocol based on beam splitters and a quantum nondemolition (QND) measurement on photons. Even if we replace the QND measurement with photon detectors, the protocol outperforms known entanglement generation schemes.

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