Decay of Loschmidt Echo Enhanced by Quantum Criticality
Decay of Loschmidt Echo Enhanced by Quantum Criticality
We study the transition of a quantum system $S $ from a pure state to a mixed one, which is induced by the quantum criticality of the surrounding system $E$ coupled to it. To characterize this transition quantitatively, we carefully examine the behavior of the Loschmidt echo (LE) of $E$ …