Microscopic origin of low frequency flux noise in Josephson circuits

Abstract

We analyze the data and discuss their implications for the microscopic origin of the low frequency flux noise in superconducting circuits. We argue that this noise is produced by spins at the superconductor insulator boundary whose dynamics is due to RKKY interaction. We show that this mechanism explains size independence of the noise, different frequency dependences of the spectra reported in large and small SQUIDs and gives the correct intensity for realistic parameters.

4 pages, no figures

References in corpus (8)

• Superconducting Circuits and Quantum Information
• Decoherence of flux qubits due to 1/f flux noise
• Model for l/f Flux Noise in SQUIDs and Qubits
• 1/f Flux Noise in Josephson Phase Qubits
• Dephasing of a superconducting flux qubit
• Superconducting Qubits: A Short Review
• Magnetism in SQUIDs at Millikelvin Temperatures
• Dangling-bond spin relaxation and magnetic 1/f noise from the amorphous-semiconductor/oxide interface: Theory

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• Decoherence induced by a sparse bath of two-level fluctuators: peculiar features of $1/f$ noise in high-quality qubits
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• Parity-protected superconducting qubit based on topological insulators
• Model for 1/f Flux noise in Superconducting Aluminum Devices: Impact of External Magnetic Fields
• Quantum Coherence in Superconducting Vortex States
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