Fluctuations of quantum entanglement |
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Authors: | E B Fel’dman and M A Yurishchev |
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Institution: | 1.Institute of Problems of Chemical Physics,Russian Academy of Sciences,Chernogolovka, Moscow region,Russia |
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Abstract: | It is emphasized that quantum entanglement determined in terms of the von Neumann entropy operator is a stochastic quantity
and, therefore, can fluctuate. The rms fluctuations of the entanglement entropy of two-qubit systems in both pure and mixed
states have been obtained. It has been found that entanglement fluctuations in the maximally entangled states are absent.
Regions where the entanglement fluctuations are larger than the entanglement itself (strong fluctuation regions) have been
revealed. It has been found that the magnitude of the relative entanglement fluctuations is divergent at the points of the
transition of systems from an entangled state to a separable state. It has been shown that entanglement fluctuations vanish
in the separable states. |
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Keywords: | |
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