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Title: Requirement of dissonance in assisted optimal state discrimination
Authors: Zhang, Fu-Lin.
Chen, Jing-Ling.
Kwek, L. C.
Vedral, Vlatko.
Issue Date: 2013
Source: Zhang, F. L., Chen, J. L., Kwek, L. C.,& Vedral, V. (2013). Requirement of Dissonance in Assisted Optimal State Discrimination. Scientific Reports, 3.
Series/Report no.: Scientific reports
Abstract: A fundamental problem in quantum information is to explore what kind of quantum correlations is responsible for successful completion of a quantum information procedure. Here we study the roles of entanglement, discord, and dissonance needed for optimal quantum state discrimination when the latter is assisted with an auxiliary system. In such process, we present a more general joint unitary transformation than the existing results. The quantum entanglement between a principal qubit and an ancilla is found to be completely unnecessary, as it can be set to zero in the arbitrary case by adjusting the parameters in the general unitary without affecting the success probability. This result also shows that it is quantum dissonance that plays as a key role in assisted optimal state discrimination and not quantum entanglement. A necessary criterion for the necessity of quantum dissonance based on the linear entropy is also presented. PACS numbers: 03.65.Ta, 03.67.Mn, 42.50.Dv
ISSN: 2045-2322
DOI: 10.1038/srep02134
Research Centres: Institute of Advanced Studies 
Rights: © 2013 Nature Publishing Group. This is Open Access journal. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:IAS Journal Articles

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