Coherence revival under the Unruh effect and its metrological advantage

• URL: http://arxiv.org/abs/2111.01358v2
• Date: Tue, 31 Dec 2024 02:20:28 GMT
• Title: Coherence revival under the Unruh effect and its metrological advantage
• Authors: Jiafan Wang, Jingjun Zhang, Jun Feng,
• Abstract summary: We find that quantum coherence as a nonclassical correlation can be generated through the Markovian evolution of the detector system.<n>We verify such coherence revival by inspecting its metrological advantage on the quantum Fisher information (QFI) enhancement.
• Score: 2.3772112135888945
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this paper, we investigate the quantum coherence extraction {between} two accelerating Unruh-DeWitt detectors, coupling to a scalar field in $(3+1)$-dimensional Minkowski spacetime. We find that quantum coherence as a nonclassical correlation can be generated through the Markovian evolution of the {detector} system, just like quantum entanglement. However, with growing Unruh temperature, in contrast to monotonously degrading entanglement, we find that quantum coherence exhibits a striking revival phenomenon. For certain detectors' initial state choices, {the} coherence measure will reduce to zero at first {and} then grow to an asymptotic value. We verify such coherence revival by inspecting its metrological advantage on the quantum Fisher information (QFI) enhancement. Since the maximal QFI {bounds} the accuracy of quantum parameter estimation, we conclude that the extracted coherence can be utilized as a physical resource in quantum metrology.

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