Intrinsic coherence in assisted sub-state discrimination

We study intrinsic coherence in the tripartite process to unambiguously discriminate two nonorthogonal states of a qubit, entangled with another one, and assisted by an auxiliary system. The optimal success probability is found to be benefited by initial intrinsic coherence, but no extra one is requ...

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Bibliographic Details
Published inEurophysics letters Vol. 117; no. 1; pp. 10013 - 13
Main Authors Zhang, Fu-Lin, Wang, Teng
Format Journal Article
LanguageEnglish
Published Les Ulis EDP Sciences, IOP Publishing and Società Italiana di Fisica 01.01.2017
IOP Publishing
Subjects
03.65.Ta
03.67.Mn
42.50.Dv
Channels
Coherence
Discrimination
Optimization
Probability theory
Quantum entanglement
Quantum teleportation
Qubits (quantum computing)
Statistical analysis
Teleportation
Transformations
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Summary:We study intrinsic coherence in the tripartite process to unambiguously discriminate two nonorthogonal states of a qubit, entangled with another one, and assisted by an auxiliary system. The optimal success probability is found to be benefited by initial intrinsic coherence, but no extra one is required. The transformations among different contributions of intrinsic coherence are necessary in this procedure, which increase with the overlap between the states to recognize. Such state discrimination is a key step of the probabilistic teleportation protocol. Entanglement of the quantum channel decreases the coherence characterizing the reliance on an ancilla.
Bibliography:ark:/67375/80W-B04GSG1J-K
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publisher-ID:epl18383
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/117/10013