Optimum Fine Resolution Spectrum Analyzer

A High-resolution Ammonia-maser- Spectrum Analyzer

High Resolution Optical Spectrum Analyzer (OSA) /Optical Complex Spectrum Analyzer (OCSA)

Optical Complex Spectrum Analyzer

Optical Complex Spectrum Analyzer (OCSA)

Nonlinear single-spin spectrum analyzer.

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 noi...