TY  - JOUR
A1  - Rubio, Jesús
A1  - Anders, Janet
A1  - Correa, Luis A.
T1  - Global quantum thermometry
T2  - Physical review letters / publ. by the American Physical Society
N2  - A paradigm shift in quantum thermometry is proposed. To date, thermometry has relied on local estimation, which is useful to reduce statistical fluctuations once the temperature is very well known. In order to estimate temperatures in cases where few measurement data or no substantial prior knowledge are available, we build instead a method for global quantum thermometry. Based on scaling arguments, a mean logarithmic error is shown here to be the correct figure of merit for thermometry. Its full minimization provides an operational and optimal rule to postprocess measurements into a temperature reading, and it establishes a global precision limit. We apply these results to the simulated outcomes of measurements on a spin gas, finding that the local approach can lead to biased temperature estimates in cases where the global estimator converges to the true temperature. The global framework thus enables a reliable approach to data analysis in thermometry experiments.
Y1  - 2021
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/57504
SN  - 0031-9007
SN  - 1079-7114
VL  - 127
IS  - 19
PB  - American Physical Society
CY  - College Park
ER  -