On quantum error-correction by classical feedback in discrete time

Details On quantum error-correction by classical feedback in discrete time On quantum error-correction by classical feedback in discrete time

2004-03-12

arxiv.org/abs/quant-ph/0403092v1

Physics

Quantum Physics

11 pages, 1 figure, revtex4

Scientific paper

10.1063/1.1758320

We consider the problem of correcting the errors incurred from sending quantum information through a noisy quantum environment by using classical information obtained from a measurement on the environment. For discrete time Markovian evolutions, in the case of fixed measurement on the environment, we give criteria for quantum information to be perfectly corrigible and characterize the related feedback. Then we analyze the case when perfect correction is not possible and, in the qubit case, we find optimal feedback maximizing the channel fidelity.

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