Spectral characterization of non-Gaussian quantum noise: Keldysh approach and application to photon shot noise

Abstract

Having accurate tools to describe non-classical, non-Gaussian environmental fluctuations is crucial for designing effective quantum control protocols and understanding the physics of underlying quantum dissipative environments. We show how the Keldysh approach to quantum noise characterization can be usefully employed to characterize frequency-dependent noise, focusing on the quantum bispectrum (i.e., frequency-resolved third cumulant). Using the paradigmatic example of photon shot noise fluctuations in a driven bosonic mode, we show that the quantum bispectrum can be a powerful tool for revealing distinctive non-classical noise properties, including an effective breaking of detailed balance by quantum fluctuations. The Keldysh-ordered quantum bispectrum can be directly accessed using existing noise spectroscopy protocols.

arXiv comment12 pages, 4 figures, including appendices

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• Objectivity of classical quantum stochastic processes
• Random-time quantum measurements
• Completely Positive Map for Noisy Driven Quantum Systems Derived by Keldysh Expansion
• Sensing Out-of-Equilibrium and Quantum Non-Gaussian environments via induced Time-Reversal Symmetry Breaking on the quantum-probe dynamics
• Quantifying environment non-classicality in dissipative open quantum dynamics
• Quantum interference in the resonance fluorescence of a $J=1/2$-$J^{\prime }=1/2$ atomic system: Quantum beats, nonclassicality, and non-Gaussianity
• Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy
• Transport of pseudothermal photons through an anharmonic cavity