Quantum detector of noise based on a system of asymmetric Al superconducting rings

Details Quantum detector of noise based on a system of asymmetric Al superconducting rings Quantum detector of noise based on a system of asymmetric Al superconducting rings

2006-02-28

arxiv.org/abs/cond-mat/0602655v1

Physics

Condensed Matter

Superconductivity

3 pages, 4 figures, WOCSDICE 2005, p.97-99

Scientific paper

The quantum rectification effect observed on asymmetric superconducting loops is proposed to use as a basic of a noise detector with maximum sensitivity. The measurements show that a critical amplitude of noise or ac current decreases down to zero near superconducting transition, Tc, just as superconducting critical current. Therefore any how weak noise, right down to the equilibrium one, can induce the quantum oscillations of the dc voltage near Tc. The transformation of the power of random noise into the dc power observed on asymmetric superconducting loops gives very important advantage: even very weak noise can give enough high output power in a system with large number of loops.

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