Entanglement of a mixed state of two qubit system

Details Entanglement of a mixed state of two qubit system Entanglement of a mixed state of two qubit system

2008-09-13

arxiv.org/abs/0809.2332v1

Physics

Quantum Physics

9 pages

Scientific paper

Interaction with environment may lead to the transition of quantum system from pure state to the mixed one. In this case, the problem of definition of entanglement may arise. In particular, quantitative measure of entanglement concurrence is introduced differently for pure and mixed states. To solve this problem, alternative definition of concurrence of mixed states is introduced in present work. In particular, concurrence of mixed states is determined as an average of pure states concurrences. Averaging is carried out over the quantum ensemble, corresponding to all possible realization of random variable.

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