Addressing the Correlation of Stokes-Shifted Photons Emitted from Two Quantum Emitters

Area of Science:

• Quantum optics
• Solid-state physics
• Spectroscopy

Background:

• Resonance fluorescence experiments typically filter laser photons, detecting only red-shifted Stokes photons.
• Theoretical models often simplify quantum emitters to two-level systems, neglecting quantum coherence effects.

Purpose of the Study:

• To propose a theoretical model for characterizing fluorescence intensity correlation.
• To include quantum coherence in the analysis of zero-phonon line and Stokes-shifted photons.

Main Methods:

• Developed a theoretical model for fluorescence intensity correlation.
• Applied the model to analyze Stokes-shifted photon emission from interacting and distant quantum emitters.

Main Results:

• The model successfully reproduces experimental correlations of Stokes-shifted photons from interacting molecules.
• Quantum coherence significantly affects the correlation of Stokes-shifted photons.
• A sharp peak at zero time delay was observed in distant emitters due to the Hanbury Brown-Twiss effect.

Conclusions:

• The proposed model accurately characterizes photon correlations, including quantum coherence.
• Quantum coherence plays a crucial role in understanding fluorescence from quantum emitters.
• The findings advance the theoretical framework for analyzing quantum emitter fluorescence spectra.