Low-Temperature Decoherence of Qubit Coupled to Background Charges

Alexander Grishin, Igor Yurkevich, Igor Lerner

Research output: Contribution to journalArticle

43 Citations (Scopus)


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 (> T) may essentially contribute to Gamma.
Original languageEnglish
Pages (from-to)060509(R)
JournalPhysical Review B
Early online date1 Aug 2005
Publication statusPublished - 25 Aug 2005


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