Decoherence of Flux Qubits due to 1/f Flux Noise

F. Yoshihara, K. Harrabi, Antti Niskanen, Y. Nakamura, J.S. Tsai

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318 Citations (Scopus)


We have investigated decoherence in Josephson-junction flux qubits. Based on the measurements of decoherence at various bias conditions, we discriminate contributions of different noise sources. We present a Gaussian decay function extracted from the echo signal as evidence of dephasing due to 1/f flux noise whose spectral density is evaluated to be about (10−6Φ0)2/Hz at 1 Hz. We also demonstrate that, at an optimal bias condition where the noise sources are well decoupled, the coherence observed in the echo measurement is limited mainly by energy relaxation of the qubit.
Original languageEnglish
Article number167001
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed


  • qubits
  • Josephson junction
  • decoherence


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