Channel correction via quantum erasure.
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 the corresponding entanglement fidelity of the corrected channel, and vice-versa. The present analysis also applies to channels for which perfect quantum erasure is impossible, thus extending the original quantum eraser arrangement, and naturally embodies a general information-disturbance trade-off.
Buscemi
Francesco
F
ERATO-SORST Quantum Computation and Information Project, Japan Science and Technology Agency, Daini Hongo White Building 201, 5-28-3 Hongo, Tokyo 113-0033, Japan. buscemi@qci.jst.go.jp