Decoherence of flux qubits due to 1/f flux noise

Details Decoherence of flux qubits due to 1/f flux noise Decoherence of flux qubits due to 1/f flux noise

2006-06-19

arxiv.org/abs/cond-mat/0606481v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, error in Fig.4 corrected, to appear in PRL

Scientific paper

10.1103/PhysRevLett.97.167001

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. In particular, we present a Gaussian decay function of the echo signal as evidence of dephasing due to $1/f$ flux noise whose spectral density is evaluated to be about $(10^{-6} \Phi_0)^2$/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 mainly limited by energy relaxation of the qubit.

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