Measurement scheme of the Berry phase in superconducting circuits

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Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2006-06-26

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Mcode

Degree programme

Language

en

Pages

10
1-10

Series

PHYSICAL REVIEW B, Volume 73, issue 21

Abstract

We present a measurement scheme for observing the Berry phase in a flux assisted Cooper pair pump—the Cooper pair sluice. In contrast to the recent experiments, in which the sluice was employed to generate accurate current through a resistance, we consider a device in a superconducting loop. This arrangement introduces a connection between the pumped current and the Berry phase accumulated during the adiabatic pumping cycles. From the adiabaticity criterion, we derive equations for the maximum pumped current and optimize the sluice accordingly. These results apply also to the high accuracy pumping which results in a potential candidate for a metrological current standard. For measuring the pumped current, an additional Josephson junction is installed into the superconducting loop. We show in detail that the switching of this system from superconducting state into normal state as a consequence of an external current pulse through it may be employed to probe the pumped current. To our knowledge the experimentalrealization of our scheme would be the first observation of the Berry phase in superconducting circuits.

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Keywords

Berry phase, Cooper pair pumping, Josephson devices

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Citation

Möttönen , M , Pekola , J P , Vartiainen , J J , Brosco , V & Hekking , F W J 2006 , ' Measurement scheme of the Berry phase in superconducting circuits ' , Physical Review B , vol. 73 , no. 21 , 214523 , pp. 1-10 . https://doi.org/10.1103/PhysRevB.73.214523