Quantum zeno effect in Cooper-pair transport through a double-island Josephson system

  • A. Shnirman
  • Yu. Makhlin
Condensed Matter


Motivated by recent experiments, we analyze transport of Cooper pairs through a double-island Josephson qubit. At low bias in a certain range of gate voltages, coherent superpositions of charge states play a crucial role. Analysis of the evolution of the density matrix allows us to cover a wide range of parameters, including situations with degenerate levels, when dissipation strongly affects the coherent eigenstates. At high noise levels, the so-called Zeno effect can be observed, which slows down the transport. Our analysis explains certain features of the I-V curves, in particular, the visibility and shape of resonant peaks and lines.

PACS numbers

74.50.+r 03.65.Xp 85.25.Cp 


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Copyright information

© MAIK "Nauka/Interperiodica" 2003

Authors and Affiliations

  • A. Shnirman
    • 1
  • Yu. Makhlin
    • 1
    • 2
  1. 1.Institut für Theoretische FestkörperphysikUniversität KarlsruheKarlsruheGermany
  2. 2.Landau Institute for Theoretical PhysicsRussian Academy of SciencesMoscowRussia

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