Quantum phase slip

Webster, C.H. (2013) Quantum phase slip. In: McGraw-Hill Yearbook of Science and Technology 2013. McGraw-Hill: New York. ISBN 9780071801409 (doi:10.1036/1097-8542.YB130173)

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Abstract

Quantum phase slip (QPS) is a phenomenon that occurs in ultranarrow superconducting nanowires and other superconducting nanostructures. In a superconductor cooled below its critical temperature Tc, electrical current can flow without resistance. However, when the radius of a superconducting nanowire is sufficiently small, quantum energy fluctuations can cause portions of the nanowire instantaneously to enter the normal resistive state. The superconducting state is characterized by a wave function with an amplitude and phase. During a quantum fluctuation, the amplitude drops temporarily to zero. When this occurs, the phase is undefined and can jump by a multiple of 2π ( Fig. 1 a ). This is known as QPS and temporarily blocks the flow of current along the nanowire.

Item Type:Book Sections
Keywords:Electrical metrology, Josephson junctions, nanowires, quantum duality, quantum tunneling, superconductivity.
Status:Published
Glasgow Author(s) Enlighten ID:Webster, Dr Carol
Authors: Webster, C.H.
College/School:College of Science and Engineering > School of Computing Science
Publisher:McGraw-Hill
ISBN:9780071801409

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