Reaching the ultimate energy resolution of a quantum detector

Bayan Karimi*, Fredrik Brange, Peter Samuelsson, Jukka P. Pekola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

61 Citations (Scopus)
132 Downloads (Pure)

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.

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

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  • -: EMP

    01/01/201931/12/2024

    Project: EU H2020 Framework program

  • QuESTech WP2 (MC)

    Pekola, J. (Principal investigator)

    01/01/201831/12/2021

    Project: EU: Framework programmes funding

  • QTF: Finnish Centre of Excellence in Quantum Technology

    Pekola, J. (Principal investigator)

    01/01/201831/12/2020

    Project: Academy of Finland: Other research funding

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