Journal
PHYSICAL REVIEW A
Volume 93, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.93.053619
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Funding
- National Research Foundation
- Ministry of Education of Singapore
- EPSRC via the Controlled Quantum Dynamics CDT
- Oxford Martin School Programme on Bio-Inspired Quantum Technologies
- European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC Grant [319286 Q-MAC]
- QuProCS [641277]
- EPSRC [EP/K038311/1, EP/J010529/1]
- EPSRC [EP/K038311/1, EP/J010529/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1102898, EP/J010529/1, EP/K038311/1] Funding Source: researchfish
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Estimating the temperature of a cold quantum system is difficult. Usually one measures a well-understood thermal state and uses that prior knowledge to infer its temperature. In contrast, we introduce a method of thermometry that assumes minimal knowledge of the state of a system and is potentially nondestructive. Our method uses a universal temperature dependence of the quench dynamics of an initially thermal system coupled to a qubit probe that follows from the Tasaki-Crooks theorem for nonequilibrium work distributions. We provide examples for a cold-atom system, in which our thermometry protocol may retain accuracy and precision at subnano-Kelvin temperatures.
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