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Fidelity approach to quantum phase transitions in quantum Ising model

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arxiv 1509.03051 v1 pith:RQX6K75D submitted 2015-09-10 quant-ph cond-mat.stat-mech

Fidelity approach to quantum phase transitions in quantum Ising model

classification quant-ph cond-mat.stat-mech
keywords fidelityquantumapproachphasetransitionsisingmodeloverlap
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Fidelity approach to quantum phase transitions uses the overlap between ground states of the system to gain some information about its quantum phases. Such an overlap is called fidelity. We illustrate how this approach works in the one dimensional quantum Ising model in the transverse field. Several closed-form analytical expressions for fidelity are discussed. An example of what insights fidelity provides into the dynamics of quantum phase transitions is carefully described. The role of fidelity in central spin systems is pointed out.

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