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Witnessing the quantum discord of all the unknown states

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arxiv 1102.4710 v1 pith:EPQWH5ZQ submitted 2011-02-23 quant-ph

Sixia Yu , Chengjie Zhang , Qing Chen , C.H.Oh This is my paper · ORCID
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keywords quantumdiscordarbitrarybipartiteentanglementobservablesinglestate
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Like entanglement, quantum discord quantifies the quantum correlations. Unlike entanglement, whose detection is extremely difficult, the quantum discord of an arbitrary bipartite state allows itself to be detected perfectly by a single observable, the quantum discord witness. In particular, we report a single observable whose expectation value provides a necessary and sufficient condition for the vanishing quantum discord of an arbitrary bipartite unknown state with four copies. A quantum circuit is designed to measure the quantum discord witness by using only local qubit-measurements.

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Cited by 1 Pith paper

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  1. Witnessing non-objectivity in the framework of strong quantum Darwinism

    quant-ph 2019-08 conditional novelty 6.0 of 10

    Comparing a system-environment evolution with and without an objectivity-enforcing projection yields a lower-bound witness for non-objectivity in strong quantum Darwinism.

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