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Acta Physica Sinica (Overseas Edition)

Quantum mechanical effects of a mesoscopic circuit

Zhao-Xian Yu, Zhang Dexing, Liu Yehou

Published Jul 1, 1997• 2 citations
Publisher

Abstract

The charge and current quantum zero-point fluctuations of an active RLC circuit with squeezed vacuum state are given, and the quantum noise of this circuit at absolute zero temperature is derived.
DOI
10.1088/1004-423x/6/7/007

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Using the path integral method we derive quantum wave function and quantum fluctuations of charge andcurrent in the mesoscopic RLC circuit. We find that the quantum fluctuation of charge decreases with time, oppositely,the quantum fluctuation of current increases with time monotonously. Therefore there is a squeezing effect in the circuit.If some more charge devices are used in the mesoscopic-damped circuit, the quantum noise can be reduced. We also findthat uncertainty relation of charge and current periodically varies with the period π/2 in the under-damped case.