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

4 Citations (Scopus)
43 Downloads (Pure)


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
Issue number1
Publication statusPublished - 1 Dec 2020
MoE publication typeA1 Journal article-refereed

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  • Projects

    QuESTech WP2 (MC)


    Project: EU: Framework programmes funding



    Anna Rissanen (Manager)

    Aalto University

    Facility/equipment: Facility

  • Press / Media

    How Sensitive Can Your Quantum Detector Be?

    J.P. Pekola & Bayan Karimi


    1 item of Media coverage

    Press/Media: Media appearance

    How sensitive can a quantum detector be? ...

    J.P. Pekola & Bayan Karimi


    1 item of Media coverage

    Press/Media: Media appearance

    Kvantti-ilmaisin mittaa minimaaliset energiamuutokset

    Jukka Pekola & Bayan Karimi


    1 item of Media coverage

    Press/Media: Media appearance

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