Title :
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
fDate :
3/1/2001 12:00:00 AM
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 Ic 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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
