Identifying and harnessing dynamical phase transitions for quantum-enhanced sensing

• URL: http://arxiv.org/abs/2103.13418v3
• Date: Tue, 17 Aug 2021 19:30:38 GMT
• Title: Identifying and harnessing dynamical phase transitions for quantum-enhanced sensing
• Authors: Qingze Guan and Robert J. Lewis-Swan
• Abstract summary: We use the quantum Fisher information (QFI) to diagnose a dynamical phase transition (DPT) in a closed quantum system. Motivated by the QFI as a quantifier of metrologically useful correlations and entanglement, we also present a robust interferometric protocol.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We use the quantum Fisher information (QFI) to diagnose a dynamical phase transition (DPT) in a closed quantum system, which is usually defined in terms of non-analytic behaviour of a time-averaged order parameter. Employing the Lipkin-Meshkov-Glick model as an illustrative example, we find that the DPT correlates with a peak in the QFI that can be explained by a generic connection to an underlying excited-state quantum phase transition that also enables us to also relate the scaling of the QFI with the behaviour of the order parameter. Motivated by the QFI as a quantifier of metrologically useful correlations and entanglement, we also present a robust interferometric protocol that can enable DPTs as a platform for quantum-enhanced sensing.

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