Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

A phenomenological model for tunneling rate of nonequilibrium quasiparticles in superconducting qubits

Mohammad H. Ansari

Published Mar 5, 2015• 0 citations
OpenAlex

Related papers

Direct Observation of Quasiparticle Tunneling Rates in a Pair of Superconducting Charge Qubits

Matthew D. Shaw, B. S. Palmer, Per Delsing +1 more

Bulletin of the American Physical Society•Mar 11, 2008•0 citations

Measurements of quasiparticle tunneling rate in a superconducting transmon qubit

Luyan Sun, L. DiCarlo, Matthew Reed +7 more

Bulletin of the American Physical Society•Mar 25, 2011•0 citations

Pure dephasing from quasiparticle tunneling in superconducting qubits

Gianluigi Catelani

Bulletin of the American Physical Society•Mar 2, 2012•0 citations

Rate of tunneling nonequilibrium quasiparticles in superconducting qubits

Mohammad H. Ansari

In superconducting qubits the lifetime of quantum states cannot be prolonged arbitrarily by decreasing temperature. At low temperature quasiparticles tunneling between electromagnetic environment and superconducting islands takes the condensate state out of equilibrium due to charge imbalance. We obtain the tunneling rate from a phenomenological model of non-equilibrium, where nonequilibrium quasiparticle tunnelling stimulates a temperature-dependent chemical potential shift in superconductor. As a result we obtain a non-monotonic behavior for relaxation rate as function of temperature. Depending on the fabrication parameters for some qubits the lowest tunneling rate of nonequilibrium quasiparticles can take place only near the onset temperature below which nonequilibrium quasiparticles dominate over equilibrium one. Our theory also indicates that such tunnelings can influence the probability of transitions in qubits through a coupling to the zero-point energy of phase fluctuations.

arXiv:1303.1453•Superconductor Science and Technology•Feb 6, 2015•11 citations

Measurement of Quasiparticle Diffusion in a Superconducting Transmon Qubit

Yuqian Dong, Yong Li, Wen Zheng +4 more

Quasiparticles, especially the ones near the Josephson junctions in the superconducting qubits, are known as an important source of decoherence. By injecting quasiparticles into a quantum chip, we characterized the diffusion feature by measuring the energy relaxation time and the residual excited-state population of a transmon qubit. From the extracted transition rates, we phenomenologically modeled the quasiparticle diffusion in a superconducting circuit that contained “hot” nonequilibrium quasiparticles in addition to low-energy ones.

Applied Sciences•Aug 24, 2022•6 citations

Quasiparticles in superconducting qubits - theory & experiments

Gianluigi Catelani

•Jan 1, 2015•0 citations
In superconducting qubits the lifetime of quantum states cannot be prolonged arbitrarily by decreasing temperature. At low temperature quasiparticles tunneling between electromagnetic environment and superconducting islands takes the condensate state out of equilibrium due to charge imbalance. We obtain the tunneling rate from a phenomenological model of non-equilibrium, where nonequilibrium quasiparticle tunnelling stimulates a temperature-dependent chemical potential shift in superconductor. As a result we obtain a non-monotonic behavior for relaxation rate as function of temperature. Depending on the fabrication parameters for some qubits the lowest tunneling rate of nonequilibrium quasiparticles can take place only near the onset temperature below which nonequilibrium quasiparticles dominate over equilibrium one. Our theory also indicates that such tunnelings can influence the probability of transitions in qubits through a coupling to the zero-point energy of phase fluctuations.
Quasiparticles, especially the ones near the Josephson junctions in the superconducting qubits, are known as an important source of decoherence. By injecting quasiparticles into a quantum chip, we characterized the diffusion feature by measuring the energy relaxation time and the residual excited-state population of a transmon qubit. From the extracted transition rates, we phenomenologically modeled the quasiparticle diffusion in a superconducting circuit that contained “hot” nonequilibrium quasiparticles in addition to low-energy ones.