Reaching the ultimate energy resolution of a quantum detector

Research output: Contribution to journalArticle

Researchers

Research units

  • Lund University

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.

Details

Original languageEnglish
Article number367
Pages (from-to)1-6
Number of pages6
JournalNature Communications
Volume11
Issue number1
Publication statusPublished - 1 Dec 2020
MoE publication typeA1 Journal article-refereed

ID: 40736466