Dynamical freezing in a driven fluxonium circuit does not suppress quasiparticle-induced decay, and the paper identifies drive-frequency operating windows that balance freezing quality against pair-breaking and tunneling losses.
Quasiparticle relaxation of superconducting qubits in the presence of flux
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abstract
Quasiparticle tunneling across a Josephson junction sets a limit for the lifetime of a superconducting qubit state. We develop a general theory of the corresponding decay rate in a qubit controlled by a magnetic flux. The flux affects quasiparticles tunneling amplitudes, thus making the decay rate flux-dependent. The theory is applicable for an arbitrary quasiparticle distribution. It provides estimates for the rates in practically important quantum circuits and also offers a new way of measuring the phase-dependent admittance of a Josephson junction.
fields
cond-mat.supr-con 1years
2026 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
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Floquet Quasiparticle Poisoning of Frozonium
Dynamical freezing in a driven fluxonium circuit does not suppress quasiparticle-induced decay, and the paper identifies drive-frequency operating windows that balance freezing quality against pair-breaking and tunneling losses.