Channel correction via quantum erasure

Details Channel correction via quantum erasure Channel correction via quantum erasure

2006-11-10

arxiv.org/abs/quant-ph/0611111v2

Phys. Rev. Lett. 99, 180501 (2007)

Physics

Quantum Physics

4 pages RevTex4. Revised version, drastically modified. To appear on PRL

Scientific paper

10.1103/PhysRevLett.99.180501

By exploiting a generalization of recent results on environment-assisted channel correction, we show that, whenever a quantum system undergoes a channel realized as an interaction with a probe, the more efficiently the information about the input state can be erased from the probe, the higher is the corresponding entanglement fidelity of the corrected channel, and vice-versa. The present analysis applies also to channels for which perfect quantum erasure is impossible, thus extending the original quantum eraser arrangement, and naturally embodies a general information-disturbance tradeoff.

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