Nonlinear single-spin spectrum analyzer

Shlomi Kotler*, Nitzan Akerman, Yinnon Glickman, Roee Ozeri

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

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.

Original languageAmerican English
Article number110503
JournalPhysical Review Letters
Volume110
Issue number11
DOIs
StatePublished - 14 Mar 2013
Externally publishedYes

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