Disentanglement in a quantum critical environment

Details Disentanglement in a quantum critical environment Disentanglement in a quantum critical environment

2007-04-10

arxiv.org/abs/0704.1172v1

Phys. Rev. A 75, 062312 (2007)

Physics

Quantum Physics

8 pages, 6 figures

Scientific paper

10.1103/PhysRevA.75.062312

We study the dynamical process of disentanglement of two qubits and two qutrits coupled to an Ising spin chain in a transverse field, which exhibits a quantum phase transition. We use the concurrence and negativity to quantify entanglement of two qubits and two qutrits, respectively. Explicit connections between the concurrence (negativity) and the decoherence factors are given for two initial states, the pure maximally entangled state and the mixed Werner state. We find that the concurrence and negativity decay exponentially with fourth power of time in the vicinity of critical point of the environmental system.

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