Measurement of energy decay in superconducting qubits from nonequilibrium quasiparticles
M. Lenander, H. Wang, Radoslaw C. Bialczak, Erik Lucero, Matteo Mariantoni, M. Neeley, A. D. O’Connell, D. Sank, M. Weides, J. Wenner, T. Yamamoto, Y. Yin, J. Zhao, A. N. Cleland, John M. Martinis
DOI 10.1103/PhysRevB.84.024501 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Quasiparticles are an important decoherence mechanism in superconducting qubits, and can be described with a complex admittance that is a generalization of the Mattis-Bardeen theory. By injecting nonequilibrium quasiparticles with a tunnel junction, we verify qualitatively the expected change of the decay rate and transition frequency in a phase qubit. With their relative change in agreement to within 4 % of prediction, the theory can be reliably used to infer quasiparticle density. We describe how settling of the decay rate may allow determination of whether qubit energy relaxation is limited by nonequilibrium quasiparticles.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Quantitative analysis of Josephson-quasiparticle current in superconducting single-electron transistors
similarity 0.96Y. Nakamura et al.
Source status unknown — claims are unverified
Quantum superposition of charge states on capacitively coupled superconducting islands
similarity 0.95C. P. Heij et al.
Source status unknown — claims are unverified
Length-Scale Dependence of the Superconductor-to-Insulator Quantum Phase Transition in One Dimension
similarity 0.95Edmond Chow et al.
Source status unknown — claims are unverified
Phase States of Multiterminal Mesoscopic Normal-Metal–Superconductor Structures
similarity 0.95P. Virtanen et al.
Source status unknown — claims are unverified
Detecting parity effect in a superconducting device in the presence of parity switches
similarity 0.95E. T. Mannila et al.
Source status unknown — claims are unverified
Suppression of Cooper-pair tunneling in superconducting charge boxes in tunable electromagnetic environments
similarity 0.95Watson Kuo et al.
Source status unknown — claims are unverified