Abstract
We investigate the quantum discord dynamics of a two-qubit system coupled to an XY spin-chain environment with energy current. We compared dynamical behaviors of quantum discord under different system-environment couplings, the size of the degrees of freedom of the environment, the anisotropy parameter, and the energy current. The results indicate that the energy current can strongly suppress the quantum discord in the weak-coupling region, while it has no obvious effect on the quantum discord in the strong-coupling regime.
Highlights
Entanglement is one of the most fascinating features of quantum mechanics and plays a central role in quantum information processing [1,2,3,4]
We have studied the quantum discord dynamics of a two-qubit system coupled to an XY spin chain constrained to carry an energy current
By considering the two qubits initially prepared in the Werner state, we have investigated the effects of system-environment coupling strength, the size of degrees of freedom of the environment, the anisotropy parameter, and the energy current on the quantum discord dynamics
Summary
Entanglement is one of the most fascinating features of quantum mechanics and plays a central role in quantum information processing [1,2,3,4]. A physical system can never be isolated; the interaction between the quantum system and its environment leads to decoherence. The effect of decoherence induced by a correlated environment on the dynamics of the quantum discord has been investigated [16, 17]. The presence of current in a quantum state can be considered as a quantum phase transition (QPT) to a current-carrying phase It has been the subject of intense theoretical studies. The effect of energy current on entanglement in the XY spin chain was studied in Ref. The effect of decoherence induced by an XY spin chain with energy current on quantum discord may be of interest. We consider the quantum discord of two qubits coupled to an XY spin chain with energy current
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