In disordered superconductors carrying a dc supercurrent, TLS coupling to ac fields is parametrically enhanced at low ω, producing enhanced real ac conductivity and 1/f equilibrium current noise when TLS relaxation times are broadly distributed.
Two -level systems in superconducting quantum devices due to trapped quasiparticles,
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Properties of two level systems in current-carrying superconductors
In disordered superconductors carrying a dc supercurrent, TLS coupling to ac fields is parametrically enhanced at low ω, producing enhanced real ac conductivity and 1/f equilibrium current noise when TLS relaxation times are broadly distributed.