Amplifying quantum correlations with quench dynamics in a quantum spin chain: Steady-states versus ground-states

Sasan Kheiri, Hadi Cheraghi and Saeed Mahdavifar

Physica A: Statistical Mechanics and its Applications, 2022, vol. 608, issue P2

Abstract: We analyze the behavior of zero-temperature quantum correlations (QCs) in a spin-1/2 transverse field XY chain analytically in the limit of infinite time after quenches, approaching the system to a steady-state. The most striking point is that the steady-state QCs are greater than the QCs present in the initial state, in the case of crossing a quench from the ferromagnetic phase to the paramagnetic phase. Another framework proposed here to amplify the QCs is a feasible protocol called double quench dynamics. To fulfill this purpose, we probe a middle quench point and spending time T, i.e., the time passing in the middle quench point before performing a second quench. By doing so, both single and double quenches act as practical tools to control the enhancement of the steady-state QCs in the final quenched point. In comparison with other contexts, we will indicate that the nonequilibrium quantum phase transitions also can be identified by nonanalyticities in the steady-state QCs. Our work may be testable with the current class of trapped-ion or ultracold-atom experiments, and encourage the possible potential in the quantum information field.

Keywords: Quantum correlations; 1 D spin-1/2 transverse field XY chains; Quench dynamics; Steady-state; Double quench; Spending time T (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:608:y:2022:i:p2:s037843712200872x

DOI: 10.1016/j.physa.2022.128314

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