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Flux qubit noise spectroscopy using Rabi oscillations under strong driving conditions
- Source :
- Physical Review B. 89
- Publication Year :
- 2014
- Publisher :
- American Physical Society (APS), 2014.
-
Abstract
- We infer the high-frequency flux noise spectrum in a superconducting flux qubit by studying the decay of Rabi oscillations under strong driving conditions. The large anharmonicity of the qubit and its strong inductive coupling to a microwave line enabled high-amplitude driving without causing significant additional decoherence. Rabi frequencies up to 1.7 GHz were achieved, approaching the qubit's level splitting of 4.8 GHz, a regime where the rotating-wave approximation breaks down as a model for the driven dynamics. The spectral density of flux noise observed in the wide frequency range decreases with increasing frequency up to 300 MHz, where the spectral density is not very far from the extrapolation of the 1/f spectrum obtained from the free-induction-decay measurements. We discuss a possible origin of the flux noise due to surface electron spins.<br />6 pages, 3 figures, and one Supplemental Material
- Subjects :
- Physics
Flux qubit
Charge qubit
Rabi cycle
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Condensed Matter - Superconductivity
FOS: Physical sciences
Spectral density
Flux
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Superconductivity (cond-mat.supr-con)
Phase qubit
Qubit
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Atomic physics
Noise (radio)
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 89
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....6e1c8e49a80cb29d6e2da3bf9ec142b8