Effect of multiple charge traps on dephasing rates of a Josephson charge qubit system

Details Effect of multiple charge traps on dephasing rates of a Josephson charge qubit system Effect of multiple charge traps on dephasing rates of a Josephson charge qubit system

2003-09-09

arxiv.org/abs/cond-mat/0309208v1

Physics

Condensed Matter

Materials Science

9 pages, 3 figures. To be published J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.72.2726

We examine the dephasing rate of a Josephson charge qubit system due to background charge fluctuations. We consider single qubit and two-charge traps. The transition probability was controlled to a state where two traps were occupied. The transition probability was affected by the Coulomb blockade effect that occurs between two charge traps. To obtain the dephasing rate, we computed the spectra of random frequency modulation signals. Our results show that the interaction between charge traps suppresses dephasing.

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