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Acta Sinica Quantum Optica

Entanglement Properties of Werner State through the Amplitude Damping and Phase Damping Channels

Liao Qing-hon

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

We investigated the entanglement properties of Werner state through the noisy quantum channels(including amplitude and phase damping channels)by employing the concurrence.We derived the analytical expression of concurrence for Werner state under the noisy quantum channels.The condition for sudden death of entanglement was obtained.

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Under amplitude damping channel, the dependence of the entanglement on the initial states and , which reduce to four orthogonal Bell states if we take the parameter of states are investigated. We find that the entanglements for different initial states will decay along different curves even with the same acceleration and parame-ter of the states. We note that, in an inertial frame, the sudden death of the entanglement for will occur if , while it will not take place for for any α. We also show that the possible range of the sudden death of the entanglement for is larger than that for . There exist two groups of Bell state here we can’t distinguish only by concurrence.