Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide

Abstract Quantum states of light and matter can be manipulated on the nanoscale to provide a technological resource for aiding implementation scalable photonic quantum technologies. Experimental progress relies quality efficiency coupling between photons internal spin emitters. Here we demonstrate nanophotonic waveguide platform with embedded dots (QDs) that enables both Purcell-enhanced emission strong chiral coupling. The design uses slow-light effects in glide-plane crystal QD tuning match frequency region. Simulations were used map chirality Purcell enhancement depending position dipole emitter relative air holes. highest factors occur separate regions, but there is still significant area where high values obtained. Based this, first record large radiative decay rate 17 ± 2 ns −1 (60 6 ps lifetime) corresponding 20 fold enhancement. This was achieved by electric-field region quasi-resonant phonon-side band excitation. We then 5 1 dot degree modes, substantially surpassing all previous measurements. Together these excellent prospects using QDs implementations on-chip spin-photonics relying optics.