Figure 4: Quantum state-controlled directional spontaneous emission into an optical nanofibre.
From: Quantum state-controlled directional spontaneous emission of photons into a nanophotonic waveguide

(a) Atomic level scheme indicating the initially excited atomic states (yellow spheres) and the decay channels (green arrows). (b) Directionality of the spontaneous emission into the nanofibre in dependence of the magnetic quantum number, mF′, of the excited 6P3/2, F′=5 states. Open circles: measurement results averaged over 3,200 and 4,000 experimental runs for mF′=±5 and mF′=±1, respectively. The error bars correspond to s.e. deviation estimation. Bars: theory prediction (see text). The experimental data and theory are in good agreement.