Measurement scheme of the Berry phase in superconducting circuits

M. Möttönen, J.P. Pekola, Juha J. Vartiainen, Valentina Brosco, F.W.J. Hekking

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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 experimental realization of our scheme would be the first observation of the Berry phase in superconducting circuits.
Original languageEnglish
Article number214523
Pages (from-to)1-10
Number of pages10
JournalPhysical Review B
Issue number21
Publication statusPublished - 26 Jun 2006
MoE publication typeA1 Journal article-refereed


  • Berry phase
  • Cooper pair pumping
  • Josephson devices

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