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Individual quantum probes for optimal thermometry

Correa, Luis A.; Mehboudi, Mohammad; Adesso, Gerardo; Sanpera, Anna

Authors

Luis A. Correa

Mohammad Mehboudi

Anna Sanpera



Abstract

The unknown temperature of a sample can be estimated with minimal disturbance by putting it in thermal contact with an individual quantum probe. If the interaction time is sufficiently long so that the probe thermalizes, the temperature can be read-out directly from its steady state. Here we prove that the optimal quantum probe, acting as a thermometer with maximal thermal sensitivity, is an effective two-level atom with a maximally degenerate excited state. When the total interaction time is insufficient to produce full thermalization, we optimize the estimation protocol by breaking it down into sequential stages of probe preparation, thermal contact, and measurement. We observe that frequently interrogated probes initialized in the ground state achieve the best performance. For both fully and partly thermalized thermometers, the sensitivity grows significantly with the number of levels, though optimization over their energy spectrum remains always crucial.

Journal Article Type Article
Publication Date Jun 5, 2015
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 114
Issue 22
APA6 Citation Correa, L. A., Mehboudi, M., Adesso, G., & Sanpera, A. (2015). Individual quantum probes for optimal thermometry. Physical Review Letters, 114(22), https://doi.org/10.1103/PhysRevLett.114.220405
DOI https://doi.org/10.1103/PhysRevLett.114.220405
Publisher URL http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.220405
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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