Low-temperature decoherence of qubit coupled to background charges

Alex Grishin, Igor V. Yurkevich, Igor V. Lerner

Research output: Contribution to journalArticlepeer-review


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 Γ 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 Γ.
Original languageEnglish
Article number060509(R)
Number of pages4
JournalPhysical Review B
Issue number6
Publication statusPublished - 25 Aug 2005


  • Josephson charge


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