Please use this identifier to cite or link to this item: https://doi.org/10.1038/srep02134
Title: Requirement of dissonance in assisted optimal state discrimination
Authors: Zhang, F.-L.
Chen, J.-L. 
Kwek, L.C. 
Vedral, V. 
Issue Date: 2013
Citation: Zhang, F.-L., Chen, J.-L., Kwek, L.C., Vedral, V. (2013). Requirement of dissonance in assisted optimal state discrimination. Scientific Reports 3 : -. ScholarBank@NUS Repository. https://doi.org/10.1038/srep02134
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.
Source Title: Scientific Reports
URI: http://scholarbank.nus.edu.sg/handle/10635/115913
ISSN: 20452322
DOI: 10.1038/srep02134
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