Fig. 1: Resonance fluorescence (RF).
a Schematic for a two-level emitter (TLE) coherently driven by a continuous-wave laser into steady-state. Brackets \(\left\vert g\right\rangle\) and \(\left\vert e\right\rangle\) represent the ground and excited states of the TLE, while \(\left\vert 0\right\rangle\) and \(\left\vert 1\right\rangle\) mean 0 or 1 spontaneously emitted photon. Symbols p0 represents the population of the system ground state while p1 is the single-quanta population that is in a form of either the TLE staying at its excited state \((\left\vert 0\right\rangle \left\vert e\right\rangle )\)) or a fresh spontaneously emitted photon (\(\left\vert 1\right\rangle \left\vert g\right\rangle\)). b Schematic of the core experimental setup. The RF is collected in the same polarisation as the excitation laser. c Second-order correlation function g(2)(Δt) measurement traces. d High resolution spectra. e Interference fringes measured with the AMZI shown in (b). In this measurement we left the AMZI's phase φ drift freely and recorded the count rate of the SPDs as a function of elapsed time. BS beam splitter, SPD single-photon detector.
