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Second-order decoherence mechanisms of a transmon qubit probed with thermal microwave states
- Source :
- Quant. Sci. Tech. 2, 025002 (2017)
- Publication Year :
- 2016
-
Abstract
- Thermal microwave states are omnipresent noise sources in superconducting quantum circuits covering all relevant frequency regimes. We use them as a probe to identify three second-order decoherence mechanisms of a superconducting transmon. First, we quantify the efficiency of a resonator filter in the dispersive Jaynes-Cummings regime and find evidence for parasitic loss channels. Second, we probe second-order noise in the low-frequency regime and demonstrate the expected $T^{3}$ temperature dependence of the qubit dephasing rate. Finally, we show that qubit parameter fluctuations due to two-level states are enhanced under the influence of thermal microwave states. In particular, we experimentally confirm the $T^{2}$-dependence of the fluctuation spectrum expected for noninteracting two-level states.<br />Comment: 13 pages, 10 figures
- Subjects :
- Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Quant. Sci. Tech. 2, 025002 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1609.07351
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/2058-9565/aa66e7