Multi-Mode Array Filtering of Resonance Fluorescence

• URL: http://arxiv.org/abs/2405.03900v4
• Date: Sun, 18 Aug 2024 22:56:34 GMT
• Title: Multi-Mode Array Filtering of Resonance Fluorescence
• Authors: Jacob Ngaha, Scott Parkins, Howard J. Carmichael,
• Abstract summary: We present a novel frequency-filtering method for measuring and calculating frequency-filtered photon-correlations. By introducing a mode-dependent phase modulation, we produce a near rectangular frequency response. We present results for the single-mode and multi-mode-array filtered second-order auto- and cross-correlation functions.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a novel frequency-filtering method for measuring and calculating frequency-filtered photon-correlations. This novel method is a cavity-based system we call the multi-mode array filter, which consists of an array of tunable single-mode cavities that are equally spaced in frequency. By introducing a mode-dependent phase modulation, we produce a near rectangular frequency response, allowing us to increase the filter bandwidth -- and thus the temporal response -- without sacrificing frequency isolation. We model the frequency filtering using a cascaded quantum open systems approach which completely neglects any back-action of the filter onto the source system. This allows us to derive a closed set of operator moment equations for source and filter system operators, thus providing an extremely efficient method to calculate frequency-filtered first- and second-order correlation functions. We demonstrate this novel filtering method by applying it to a resonantly driven two-level atom. We present examples of frequency-filtered power spectra to demonstrate the improved frequency isolation of the multi-mode array filter over the single-mode filter. We then present results for the single-mode and multi-mode-array filtered second-order auto- and cross-correlation functions. These are compared against expressions derived in the secular approximation. The improved frequency isolation of the multi-mode array filter allows us to investigate new regimes of frequency-filtered photon correlations, such as two-photon leapfrog processes, and the effect of vanishing bandwidth on filtered auto-correlation functions.

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