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- W2898848846 abstract "When a quantum system is divided into two local subsystems, measurements on the two subsystems can exhibit correlations beyond those possible in a classical joint probability distribution; these are partially explained by entanglement, and more generally by a wider class of measures such as the quantum discord. In this work, I introduce a simple thought experiment defining a new measure of quantum correlations, which I call the accord, and write the result as a minimax optimization over unitary matrices. I find the exact result for pure states as a simple function of the Schmidt coefficients and provide a complete proof, and I likewise provide and prove the result for several classes of mixed states, notably including all states of two qubits and the experimentally relevant case of a pure state mixed with colorless noise. I demonstrate that for two qubit states the accord provides a tight lower bound on the discord; for Bell diagonal states it is also an upper bound on entanglement." @default.
- W2898848846 created "2018-11-09" @default.
- W2898848846 creator A5030923636 @default.
- W2898848846 date "2018-10-30" @default.
- W2898848846 modified "2023-09-27" @default.
- W2898848846 title "A measure of quantum correlations that lies between entanglement and discord" @default.
- W2898848846 hasPublicationYear "2018" @default.
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