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Inverting quantum decoherence by classical feedback from the environment

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arxiv quant-ph/0504195 v5 pith:KV3HCZFT submitted 2005-04-26 quant-ph

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keywords environmentclassicalquantumqubitsaccessalwaysamountcoherence
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We show that for qubits and qutrits it is always possible to perfectly recover quantum coherence by performing a measurement only on the environment, whereas for dimension d>3 there are situations where recovery is impossible, even with complete access to the environment. For qubits, the minimal amount of classical information to be extracted from the environment equals the entropy exchange.

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