Quantum Roulette Noise Thermometer: Progress and prospects

Author

Lee, Richard A M ; Hao, Ling ; Peden, Derek A. ; Gallop, John C. ; Macfarlane, John C. ; Romans, Edward J.

Author_Institution

Nat. Phys. Lab., Teddington, UK

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

859

Lastpage

862

Abstract

A novel form of primary thermometer called the Quantum Roulette Noise Thermometer (QRNT) has been fabricated and is presently undergoing feasibility studies. This device utilises flux quantisation in a high temperature superconducting ring interrupted by two closely spaced, parallel, Josephson junctions. Several devices have been fabricated and different methods investigated for measuring the statistical distribution of trapped flux states. We report the results of these endeavours with emphasis on a method for suppressing I_c by applying an r.f. field to the junctions

Keywords

Josephson effect; high-temperature superconductors; quantum noise; superconducting device noise; thermometers; Josephson junction; RF field; critical current; flux quantisation; high temperature superconducting ring; primary thermometer; quantum roulette noise thermometer; statistical distribution; trapped flux state; Critical current; Fluctuations; High temperature superconductors; Inductance; Josephson junctions; Metastasis; Quantization; Statistical distributions; Superconducting device noise; Temperature dependence;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919480

Filename

919480