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Low-Temperature Decoherence of Qubit Coupled to Background Charges | Alex Grishin
; Igor V. Yurkevich
; Igor V. Lerner
; | Date: |
14 Dec 2004 | Subject: | Mesoscopic Systems and Quantum Hall Effect; Superconductivity | cond-mat.mes-hall cond-mat.supr-con | Affiliation: | School of Physics and Astronomy, University of Birmingham, United Kingdom | Abstract: | We have found an exact expression for the decoherence rate of a Josephson charge qubit coupled to fluctuating background charges. At low temperatures $T$ the decoherence rate ${Gamma}$ is linear in $T$ while at high temperatures it saturates in agreement with a known classical solution which, however, reached at surprisingly high $T$. In contrast to the classical picture, impurity states spread in a wide interval of energies ($gg T$) may essentially contribute to ${Gamma}$. | Source: | arXiv, cond-mat/0412377 | Services: | Forum | Review | PDF | Favorites |
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