Cooper-pair current in the presence of flux noise

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2012
Major/Subject
Mcode
Degree programme
Language
en
Pages
024527/1-9
Series
Physical Review B, Volume 85, Issue 2
Abstract
We study the effect of flux noise on the Cooper pair current of a superconducting charge pump. We generalize the definition of the current in order to take into account the contribution induced by the environment. It turns out that this dissipative current vanishes for charge noise but it is finite in general for noise operators that do not commute with the charge operator. We discuss in a generic framework the effect of flux noise and present a way to engineer it by coupling the system to an additional external circuit. We calculate numerically the pumped charge through the device by solving the master equation for the reduced density matrix of the system and show how it depends on the coupling to the artificial environment.
Description
Keywords
Cooper-pairs, currents, flux noise, superconducting, charge pumps
Other note
Citation
Solinas, P. & Möttönen, M. & Salmilehto, J. & Pekola, Jukka. 2012. Cooper-pair current in the presence of flux noise. Physical Review B. Volume 85, Issue 2. 024527/1-9. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.85.024527.