General probe-environment correlations enable non-completely positive encodings that surpass the thermal-state bound in quantum thermometry precision.
Preskill,Lecture Notes for Physics 229: Quantum Infor- mation and Computation(California Institute of Technology, Pasadena, CA, 1998)
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Surpassing thermal-state limit in thermometry via non-completely positive quantum encoding
General probe-environment correlations enable non-completely positive encodings that surpass the thermal-state bound in quantum thermometry precision.