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

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.