Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint

Details Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint Fidelity criterion for quantum-domain transmission and storage of coherent states beyond unit-gain constraint

2007-03-17

arxiv.org/abs/quant-ph/0703158v2

Phys. Rev. Lett. 101, 100502 (2008).

Physics

Quantum Physics

4pages, No figures, Accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.101.100502

We generalize the experimental success criterion for quantum teleportation/memory in continuous-variable quantum systems to be suitable for non-unit-gain condition by considering attenuation/amplification of the coherent-state amplitude. The new criterion can be used for a non-ideal quantum memory and long distance quantum communication as well as quantum devices with amplification process. It is also shown that the framework to measure the average fidelity is capable of detecting all Gaussian channels in quantum domain.

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