Reaching the ultimate energy resolution of a quantum detector

Bayan Karimi (), Fredrik Brange, Peter Samuelsson and Jukka P. Pekola ()
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Bayan Karimi: Aalto University School of Science
Fredrik Brange: Lund University
Peter Samuelsson: Lund University
Jukka P. Pekola: Aalto University School of Science

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Quantum calorimetry, the thermal measurement of quanta, is a method of choice for ultrasensitive radiation detection ranging from microwaves to gamma rays. The fundamental temperature fluctuations of the calorimeter, dictated by the coupling of it to the heat bath, set the ultimate lower bound of its energy resolution. Here we reach this limit of fundamental equilibrium fluctuations of temperature in a nanoscale electron calorimeter, exchanging energy with the phonon bath at very low temperatures. The approach allows noninvasive measurement of energy transport in superconducting quantum circuits in the microwave regime with high efficiency, opening the way, for instance, to observe quantum jumps, detecting their energy to tackle central questions in quantum thermodynamics.

Date: 2020
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DOI: 10.1038/s41467-019-14247-2

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