Quenching Dynamics and Quantum Information

Nag, Tanay ; Dutta, Amit ; Patra, Ayoti (2013) Quenching Dynamics and Quantum Information International Journal of Modern Physics B, 27 (01n03). p. 1345036. ISSN 0217-9792

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Official URL: http://doi.org/10.1142/S0217979213450367

Related URL: http://dx.doi.org/10.1142/S0217979213450367


We review recent studies on the measures of zero temperature quantum correlations namely, the quantum entanglement (concurrence) and discord present in the final state of a transverse XY spin chain following a quench through quantum critical points; the aim of these studies is to explore the scaling of the above quantities as a function of the quench rate. A comparative study between the concurrence and the quantum discord shows that their behavior is qualitatively the same though there are quantitative differences. For the present model, the scaling of both the quantities are given by the scaling of the density of the defect present in the final state though one cannot find a closed form expression for the discord. We also extend our study of quantum discord to a transverse Ising chain in the presence of a three spin interaction. Finally, we present a study of the dynamical evolution of quantum discord and concurrence when two central qubits, initially prepared in a Werner state, are coupled to the environmental XY spin chain which is driven through quantum critical points. The qualitative behavior of quantum discord and concurrence are found to be similar as that of the decoherence factor.

Item Type:Article
Source:Copyright of this article belongs to World Scientific Publishing Co Pte Ltd.
Keywords:Quantum Phase Transitions; Non Equilibrium Dynamics; Concurrence; Discord.
ID Code:117277
Deposited On:16 Apr 2021 05:46
Last Modified:16 Apr 2021 05:46

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