Relaxation and frequency shifts induced by quasiparticles in superconducting qubits
By G. Catelani, Robert J. Schoelkopf, Michel H. Devoret, L. Glazman. 2011
203 citations recorded by the source corpus.
As low-loss nonlinear elements, Josephson junctions are the building blocks of superconducting qubits. The interaction of the qubit degree of freedom with the quasiparticles tunneling through the junction represents an intrinsic relaxation mechanism. We develop a general theory for the qubit decay rate induced by quasiparticles, and we study its dependence on the magnetic flux used to tune the qubit properties in devices such as the phase and flux qubits, the split transmon, and the fluxonium. Our estimates for the decay rate apply to both thermal equilibrium and nonequilibrium quasiparticles. We propose measuring the rate in a split transmon to obtain information on the possible nonequilibrium quasiparticle distribution. We also derive expressions for the shift in qubit frequency in the presence of quasiparticles.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/ae91195509ebef5d204d5f71e8a3fa7ebf3e7d1a
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- High-Coherence Fluxonium Qubit (2018, background): “A qubit can relax by emitting a photon which is absorbed by an unpaired quasiparticle tunneling across a junction [39,40].”