Dissonance is required for assisted optimal state discrimination

The roles of quantum correlations, entanglement, discord, and dissonance needed for performing unambiguous quantum state discrimination assisted by an auxiliary system are studied. In general, this procedure for conclusive recognition between two nonorthogonal states relies on the availability of en...

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Bibliographic Details
Published in:Physical review letters 2011-08, Vol.107 (8), p.080401-080401, Article 080401
Main Authors: Roa, Luis, Retamal, J C, Alid-Vaccarezza, M
Format: Article
Language:English
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Summary:The roles of quantum correlations, entanglement, discord, and dissonance needed for performing unambiguous quantum state discrimination assisted by an auxiliary system are studied. In general, this procedure for conclusive recognition between two nonorthogonal states relies on the availability of entanglement and discord. However, we find that there exist special cases for which the procedure can be successfully achieved without entanglement. In particular, we show that the optimal case for discriminating between two nonorthogonal states prepared with equal a priori probabilities does not require entanglement but quantum dissonance only.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.107.080401