More Entanglement Implies Higher Performance in Channel Discrimination Tasks

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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.
Publisher
AMER PHYSICAL SOC
Issue Date
2019-04
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.122, no.14

ISSN
0031-9007
DOI
10.1103/PhysRevLett.122.140404
URI
http://hdl.handle.net/10203/261726
Appears in Collection
EE-Journal Papers(저널논문)
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