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Nonlinear single-spin spectrum analyzer.

Shlomi Kotler1, Nitzan Akerman1, Yinnon Glickman1

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Summary
This summary is machine-generated.

This study introduces nonlinear spectral analysis for discrete noise, achieving resolution beyond the Fourier limit using qubits. A novel noise characterization scheme was developed and tested with a trapped ion probe.

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Area of Science:

  • Quantum Information Science
  • Quantum Sensing
  • Spectroscopy

Background:

  • Qubits are established as linear spectrum analyzers.
  • Linear analysis is insufficient for discrete noise from strongly coupled environments.

Purpose of the Study:

  • To develop a method for nonlinear spectral analysis of discrete noise.
  • To characterize noise in strongly coupled qubit environments.
  • To achieve spectral resolution beyond the Fourier limit.

Main Methods:

  • Developed a nonperturbative analytical model for nonlinear spectral analysis.
  • Created a noise characterization scheme tailored to nonlinear effects.
  • Utilized a single trapped ion as a quantum probe.
  • Experimentally compared equidistant and Uhrig modulation schemes.

Main Results:

  • Demonstrated nonlinear signal dependence on noise power.
  • Achieved spectral resolution surpassing the Fourier limit.
  • Observed frequency mixing effects.
  • Successfully probed strong, non-Gaussian, discrete magnetic field noise with a trapped ion.

Conclusions:

  • Nonlinear spectral analysis provides enhanced capabilities for characterizing complex noise environments.
  • The developed methods offer superior spectral resolution compared to traditional linear techniques.
  • Trapped ions are effective probes for investigating non-Gaussian noise phenomena.