Coherence in resonance fluorescence

Abstract

Resonance fluorescence of a two-level emitter displays persistently anti-bunching irrespective of the excitation intensity, but inherits the driving laser's linewidth under weak monochromatic excitation. These properties are commonly explained in terms of two disjoined pictures, i.e., the emitter's single photon saturation or passively scattering light. Here, we propose a unified model that treats all fluorescence photons as spontaneous emission, one at a time, and can explain simultaneously both the spectral and correlation properties of the emission. We theoretically derive the excitation power dependencies, measurable at the single-photon incidence level, of the first-order coherence of the whole resonance fluorescence and super-bunching of the spectrally filtered, followed by experimental confirmation on a semiconductor quantum dot micro-pillar device. Furthermore, our model explains peculiar coincidence bunching observed in phase-dependent two-photon interference experiments. Our work provides an intuitive understanding of coherent light-matter interaction and may stimulate new applications.

Theoretical derivation of Eq. (1) is included

References in corpus (7)

• Efficient coupling of photons to a single molecule and the observation of its resonance fluorescence
• Quantum Beat of Two Single Photons
• Experimental Quantum Communication Overcomes the Rate-loss Limit without Global Phase Tracking
• Phase-locked indistinguishable photons with synthesized waveforms from a solid-state source
• Measuring the photon coalescence time-window in the continuous-wave regime for resonantly driven semiconductor quantum dots
• Controlling the Photon Number Coherence of Solid-state Quantum Light Sources for Quantum Cryptography
• Two photons everywhere

Cited by in corpus (1)

• Two-photon interference between mutually-detuned resonance fluorescence signals scattered off a semiconductor quantum dot