Operational significance of nonclassicality in nonequilibrium Gaussian quantum thermometry

We provide new operational significance of nonclassicality in nonequilibrium temperature estimation of bosonic baths with Gaussian probe states and Gaussian dynamics. We find a bound on the thermometry performance using classical probe states. Then we show that by using nonclassical probe states, si...

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Bibliographic Details
Published in:New journal of physics 2024-02, Vol.26 (2), p.23046
Main Authors: Mirkhalaf, Safoura, Mehboudi, Mohammad, Nafari Qaleh, Zohre, Rahimi-Keshari, Saleh
Format: Article
Language:English
Subjects:
Brownian motion
continuous variable systems
Optics
Physics
quantum metrology
Quantum optics
quantum thermometry
Thermometry
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Summary:We provide new operational significance of nonclassicality in nonequilibrium temperature estimation of bosonic baths with Gaussian probe states and Gaussian dynamics. We find a bound on the thermometry performance using classical probe states. Then we show that by using nonclassical probe states, single-mode and two-mode squeezed vacuum states, one can profoundly improve the classical limit. Interestingly, we observe that this improvement can also be achieved by using Gaussian measurements. Hence, we propose a fully Gaussian protocol for enhanced thermometry, which can simply be realized and used in quantum optics platforms.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ad23a1