Phonon decoherence of quantum entanglement: Robust and fragile states

Details Phonon decoherence of quantum entanglement: Robust and fragile states Phonon decoherence of quantum entanglement: Robust and fragile states

2002-09-04

arxiv.org/abs/quant-ph/0209037v1

Phys. Rev. B, 66 (2002) 193306

Physics

Quantum Physics

11 pages, revtex, no figures

Scientific paper

10.1103/PhysRevB.66.193306

We study the robustness and fragility of entanglement of open quantum systems in some exactly solvable models in which the decoherence is caused by a pure dephasing process. In particular, for the toy models presented in this paper, we identify two different time scales, one is responsible for local dephasing, while the other is for entanglement decay. For a class of fragile entangled states defined in this paper, we find that the entanglement of two qubits, as measured by concurrence, decays faster asymptotically than the quantum dephasing of an individual qubit.

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