2020
DOI: 10.48550/arxiv.2001.03189
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In and out of equilibrium quantum metrology with mean-field quantum criticality

Sascha Wald,
Saulo V. Moreira,
Fernando L. Semião

Abstract: We study the influence that collective transition phenomena have on quantum metrological protocols. The single spherical quantum spin (SQS) serves as stereotypical toy model that allows analytical insights on a mean-field level. First, we focus on equilibrium quantum criticality in the SQS and obtain the quantum Fisher information analytically, which is associated with the minimum lower bound for the precision of estimation of the parameter driving the phase transition. We compare it with the Fisher informatio… Show more

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