Comparing a system-environment evolution with and without an objectivity-enforcing projection yields a lower-bound witness for non-objectivity in strong quantum Darwinism.
Witnessing the quantum discord of all the unknown states
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abstract
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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2019 1verdicts
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Witnessing non-objectivity in the framework of strong quantum Darwinism
Comparing a system-environment evolution with and without an objectivity-enforcing projection yields a lower-bound witness for non-objectivity in strong quantum Darwinism.