Coherent Spin-Photon Interface with Waveguide Induced Cycling Transitions
Martin Hayhurst Appel, Alexey Tiranov, Alisa Javadi, Matthias C. Löbl, Ying Wang, Sven Scholz, Andreas Dirk Wieck, Arne Ludwig, Richard John Warburton, Peter Lodahl · Physical Review Letters · 2021
Solid-state quantum dots are promising candidates for efficient light-matter interfaces connecting internal spin degrees of freedom to the states of emitted photons. However, selection rules prevent the combination of efficient spin control and optical cyclicity in this platform. By utilizing a photonic crystal waveguide we here experimentally demonstrate optical cyclicity up to ≈15 through photonic state engineering while achieving high fidelity spin initialization and coherent optical spin control. These capabilities pave the way towards scalable multiphoton entanglement generation and on-chip spin-photon gates.