More Entanglement Implies Higher Performance in Channel Discrimination Tasks
We show that every entangled state provides an advantage in ancilla-assisted bi- and multichannel discrimination that singles out its degree of entanglement, quantified in terms of the Schmidt number. The Schmidt-number robustness provides a compelling quantification of such an advantage, and, remar...
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Veröffentlicht in: | Physical review letters 2019-04, Vol.122 (14), p.140404-140404, Article 140404 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We show that every entangled state provides an advantage in ancilla-assisted bi- and multichannel discrimination that singles out its degree of entanglement, quantified in terms of the Schmidt number. The Schmidt-number robustness provides a compelling quantification of such an advantage, and, remarkably, the well-known robustness of entanglement exactly provides the largest multiplicative advantage an entangled state can provide compared to the case where no ancilla is used in a channel discrimination task. |
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ISSN: | 0031-9007 1079-7114 |
DOI: | 10.1103/PhysRevLett.122.140404 |