Reversing quantum dynamics with near-optimal quantum and classical fidelity

Details Reversing quantum dynamics with near-optimal quantum and classical fidelity Reversing quantum dynamics with near-optimal quantum and classical fidelity

2000-04-23

arxiv.org/abs/quant-ph/0004088v1

Physics

Quantum Physics

4 pages

Scientific paper

We consider the problem of reversing quantum dynamics, with the goal of preserving an initial state's quantum entanglement or classical correlation with a reference system. We exhibit an approximate reversal operation, adapted to the initial density operator and the ``noise'' dynamics to be reversed. We show that its error in preserving either quantum or classical information is no more than twice that of the optimal reversal operation. Applications to quantum algorithms and information transmission are discussed.

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