Self-Calibrating Superconducting Pair-Breaking Detector

被引：4

作者：

Mannila, E. T. ^{[1
]}

Maisi, V. F. ^{[2
,3
]}

Pekola, J. P. ^{[1
]}

机构：

[1] Aalto Univ, QTF Ctr Excellence, Dept Appl Phys, FI-00076 Aalto, Finland

[2] Lund Univ, Phys Dept, Box 118, S-22100 Lund, Sweden

[3] Lund Univ, NanoLund, Box 118, S-22100 Lund, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 14期

基金：

美国国家科学基金会; 芬兰科学院;

关键词：

COULOMB-BLOCKADE; PHOTON DETECTION; THERMOMETRY; TRANSPORT; LIFETIMES; PHONONS; ISLANDS; ARRAYS;

D O I：

10.1103/PhysRevLett.127.147001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：7

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