Quantum Zeno effect in the Cooper-pair transport through a double-island Josephson system
Mesoscale and Nanoscale Physics
2007-05-23 v1
Abstract
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, incl. 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.
Keywords
Cite
@article{arxiv.cond-mat/0311189,
title = {Quantum Zeno effect in the Cooper-pair transport through a double-island Josephson system},
author = {Alexander Shnirman and Yuriy Makhlin},
journal= {arXiv preprint arXiv:cond-mat/0311189},
year = {2007}
}