Quantum benchmark for storage and transmission of coherent states

Details Quantum benchmark for storage and transmission of coherent states Quantum benchmark for storage and transmission of coherent states

2004-09-17

arxiv.org/abs/quant-ph/0409109v2

PRL 94, 150503 (2005)

Physics

Quantum Physics

4 pages, references added, minor changes

Scientific paper

10.1103/PhysRevLett.94.150503

We consider the storage and transmission of a Gaussian distributed set of coherent states of continuous variable systems. We prove a limit on the average fidelity achievable when the states are transmitted or stored by a classical channel, i.e., a measure and repreparation scheme which sends or stores classical information only. The obtained bound is tight and serves as a benchmark which has to be surpassed by quantum channels in order to outperform any classical strategy. The success in experimental demonstrations of quantum memories as well as quantum teleportation has to be judged on this footing.

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