Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevLett.105.190502
Title: Necessary and sufficient condition for nonzero quantum discord
Authors: Dakić, B.
Vedral, V. 
Brukner, C.
Issue Date: 2-Nov-2010
Source: Dakić, B., Vedral, V., Brukner, C. (2010-11-02). Necessary and sufficient condition for nonzero quantum discord. Physical Review Letters 105 (19) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevLett.105.190502
Abstract: Quantum discord characterizes "nonclassicality" of correlations in quantum mechanics. It has been proposed as the key resource present in certain quantum communication tasks and quantum computational models without containing much entanglement. We obtain a necessary and sufficient condition for the existence of nonzero quantum discord for any dimensional bipartite states. This condition is easily experimentally implementable. Based on this, we propose a geometrical way of quantifying quantum discord. For two qubits this results in a closed form of expression for discord. We apply our results to the model of deterministic quantum computation with one qubit, showing that quantum discord is unlikely to be the reason behind its speedup. © 2010 The American Physical Society.
Source Title: Physical Review Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/97304
ISSN: 00319007
DOI: 10.1103/PhysRevLett.105.190502
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