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Relaxation and frequency shifts induced by quasiparticles in superconducting qubits
Open accessAbstract
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.
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Citations
Cites
Controlling the Spontaneous Emission of a Superconducting Transmon Qubit
Houck, A. A., Schreier, J. A., Johnson, B. R., Chow, J. M., Koch, J., Gambetta, J. M., Schuster, D. I., Frunzio, L., Devoret, M. H., Girvin, S. M., et al. (2008) · Physical Review Letters · doi:10.1103/physrevlett.101.080502 · Cited by 501
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The flux qubit revisited to enhance coherence and reproducibility
Yan, F., Gustavsson, S., Kamal, A., Birenbaum, J., Sears, A. P., Hover, D., Gudmundsen, T. J., Rosenberg, D., Samach, G., Weber, S., et al. (2016) · Nature Communications · doi:10.1038/ncomms12964 · Cited by 587
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Pop, I. M., Geerlings, K., Catelani, G., Schoelkopf, R. J., Glazman, L. I., & Devoret, M. H. (2014) · Nature · doi:10.1038/nature13017 · Cited by 332
Self-citationEngineering high-coherence superconducting qubits
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Metadata
- Authors
- Catelani, G., Schoelkopf, R. J., Devoret, M. H., & Glazman, L. I.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2011-08-23
- Volume
- 84
- Issue
- 6
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W1993970695
- Cited by
- 243
- References
- 1
- FWCI
- 10.05
- Type
- journal article
- Language
- en
- Open access
- green
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- Catelani, G., Schoelkopf, R. J., Devoret, M. H., & Glazman, L. I. (2011). Relaxation and frequency shifts induced by quasiparticles in superconducting qubits. Physical Review B. https://doi.org/10.1103/physrevb.84.064517
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