Disentanglement of two qubits coupled to an XY spin chain: Role of quantum phase transition

Abstract

We study the disentanglement of two spin qubits which interact with a general XY spin-chain environment. The dynamical process of the disentanglement is numerically and analytically investigated in the vicinity of quantum phase transition (QPT) of the spin chain in both weak and strong coupling cases. We find that the disentanglement of the two qubits is in general enhanced greatly when the environmental spin chain is exposed to QPT. We give a detailed analysis to facilitate the understanding of the QPT-enhanced decaying behavior of the disentanglement factor. Furthermore, the scaling behavior in the disentanglement dynamics is also revealed and analyzed.

17 pages, 5 figures

References in corpus (4)

• Finite-Time Disentanglement via Spontaneous Emission
• Dynamics of Loschmidt echoes and fidelity decay
• Decoherence induced by interacting quantum spin baths
• Universal decoherence induced by an environmental quantum phase transition

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• Collective Quantum Batteries and Charger-Battery Setup in Open Quantum Systems: Impact of Inter-Qubit Interactions, Dissipation, and Quantum Criticality