Model for l/f Flux Noise in SQUIDs and Qubits

Abstract

We propose a model for 1/f flux noise in superconducting devices (f is frequency). The noise is generated by the magnetic moments of electrons in defect states which they occupy for a wide distribution of times before escaping. A trapped electron occupies one of the two Kramers-degenerate ground states, between which the transition rate is negligible at low temperature. As a result, the magnetic moment orientation is locked. Simulations of the noise produced by randomly oriented defects with a density of 5*10^17 m^-2 yield 1/f noise magnitudes in good agreement with experiments.

16 pages, 4 figures; v2: Various minor changes. Physical Review Letters, in press

References in corpus (1)

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

Cited by in corpus (16)

• Optimized Dynamical Decoupling in a Model Quantum Memory
• 1/f Flux Noise in Josephson Phase Qubits
• Magnetism in SQUIDs at Millikelvin Temperatures
• Decoherence in qubits due to low-frequency noise
• Microscopic origin of low frequency flux noise in Josephson circuits
• Dangling-bond spin relaxation and magnetic 1/f noise from the amorphous-semiconductor/oxide interface: Theory
• Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling
• Geometrical dependence of low frequency noise in superconducting flux qubits
• Spin-like susceptibility of metallic and insulating thin films at low temperature
• Enhancement of quasiparticle recombination in Ta and Al superconductors by implantation of magnetic and nonmagnetic atoms
• Macroscopic Resonant Tunneling in the Presence of Low Frequency Noise
• Relaxation of Josephson qubits due to strong coupling to two-level systems
• A Josephson Junction Microscope for Low-frequency Fluctuators
• Suppression of the critical current of a balanced SQUID
• Realistic quantum manipulation of two-level system fluctuators
• Direct string magnetic gradiometer for space applications