Enhancing Gaussian quantum metrology with position-momentum correlations
Quantum metrology offers significant improvements in several quantum technologies. In this work, we propose a Gaussian quantum metrology protocol assisted by initial position-momentum correlations (PM). We employ a correlated Gaussian wave packet as a probe to examine the dynamics of Quantum Fisher...
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Main Authors | , , , , |
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Format | Journal Article |
Language | English |
Published |
23.08.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Quantum metrology offers significant improvements in several quantum
technologies. In this work, we propose a Gaussian quantum metrology protocol
assisted by initial position-momentum correlations (PM). We employ a correlated
Gaussian wave packet as a probe to examine the dynamics of Quantum Fisher
Information (QFI) and purity based on PM correlations to demonstrate how to
estimate the PM correlations and, more importantly, to unlock its potential
applications such as a resource to enhance quantum thermometry. In the
low-temperature regime, we find an improvement in the thermometry of the
surrounding environment when the original system exhibits a non-null initial
correlation (correlated Gaussian state). In addition, we explore the connection
between the loss of purity and the gain in QFI during the process of estimating
the effective environment coupling and its effective temperature. |
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DOI: | 10.48550/arxiv.2408.13060 |