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Unambiguous discrimination among quantum operations

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arxiv quant-ph/0512142 v3 pith:HNOAVVWD submitted 2005-12-18 quant-ph

Unambiguous discrimination among quantum operations

classification quant-ph
keywords discriminationoperationsquantumunambiguousaccomplishaddresscasecases
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We address the problem of unambiguous discrimination among a given set of quantum operations. The necessary and sufficient condition for them to be unambiguously distinguishable is derived in the cases of single use and multiple uses respectively. For the latter case we explicitly construct the input states and corresponding measurements that accomplish the task. It is found that the introduction of entanglement can improve the discrimination.

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