Robust and fragile Werner states in the collective dephasing

Abstract

We investigate the concurrence and Bell violation of the standard Werner state or Werner-like states in the presence of collective dephasing. It is shown that the standard Werner state and certain kinds of Werner-like states are robust against the collective dephasing, and some kinds of Werner-like states is fragile and becomes completely disentangled in a finite-time. The threshold time of complete disentanglement of the fragile Werner-like states is given. The influence of external driving field on the finite-time disentanglement of the standard Werner state or Werner-like states is discussed. Furthermore, we present a simple method to control the stationary state entanglement and Bell violation of two qubits. Finally, we show that the theoretical calculations of fidelity based on the initial Werner state assumption well agree with previous experimental results.

7 pages, 6 figures, 1 table, RevTex4, Accepted by EPJ D

References in corpus (5)

• Experimental quantum teleportation
• Finite-Time Disentanglement via Spontaneous Emission
• A Magnetic Resonance Realization of Decoherence-Free Quantum Computation
• Violation of Bell inequality and entanglement of decaying Werner states
• Gates for the Kane Quantum Computer in the Presence of Dephasing

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• Prisoners' Dilemma in Presence of Collective Dephasing
• Teleporting bipartite entanglement using maximally entangled mixed channels
• Freezing dynamics of entanglement and nonlocality for qutrit-qutrit ($3\otimes 3$) quantum systems