Coherent Spin-Photon Interface with Waveguide Induced Cycling Transitions

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 approximate 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.

Automated summary

Solid-state quantum dots show promise as efficient light-matter interfaces connecting internal spin degrees of freedom to emitted photon states. However, selection rules currently prevent the combination of efficient spin control and optical cyclicity in this platform. By utilizing a photonic crystal waveguide, researchers have experimentally demonstrated optical cyclicity while achieving high fidelity spin initialization and coherent optical spin control, paving the way for scalable multiphoton entanglement generation and on-chip spin-photon gates.