Self-Calibrating Superconducting Pair-Breaking Detector

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-10-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
7
Series
Physical Review Letters, Volume 127, issue 14
Abstract
We propose and experimentally demonstrate a self-calibrating detector of Cooper pair depairing in a superconductor based on a mesoscopic superconducting island coupled to normal metal leads. On average, exactly one electron passes through the device per broken Cooper pair, independent of the absorber volume, device, or material parameters. The device operation is explained by a simple analytical model and verified with numerical simulations in quantitative agreement with experiment. In a proof-of-concept experiment, we use such a detector to measure the high-frequency phonons generated by another, electrically decoupled superconducting island, with a measurable signal resulting from less than 10 fW of dissipated power.
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Keywords
COULOMB-BLOCKADE, PHOTON DETECTION, THERMOMETRY, TRANSPORT, LIFETIMES, PHONONS, ISLANDS, ARRAYS
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Citation
Mannila , E T , Maisi , V F & Pekola , J P 2021 , ' Self-Calibrating Superconducting Pair-Breaking Detector ' , Physical Review Letters , vol. 127 , no. 14 , 147001 . https://doi.org/10.1103/PhysRevLett.127.147001