期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.110503
关键词
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资金
- Israeli Science Foundation
- Minerva Foundation
- German-Israeli Foundation for Scientific Research
- US-Israel Binational Science Foundation
- Crown Photonics Center
Qubits have been used as linear spectrum analyzers of their environments. Here we solve the problem of nonlinear spectral analysis, required for discrete noise induced by a strongly coupled environment. Our nonperturbative analytical model shows a nonlinear signal dependence on noise power, resulting in a spectral resolution beyond the Fourier limit as well as frequency mixing. We develop a noise characterization scheme adapted to this nonlinearity. We then apply it using a single trapped ion as a sensitive probe of strong, non-Gaussian, discrete magnetic field noise. Finally, we experimentally compared the performance of equidistant vs Uhrig modulation schemes for spectral analysis. DOI: 10.1103/PhysRevLett.110.110503
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