Solid-state quantum interfaces of spins and photons

D. D. Awschalom, Ronald Hanson, Jörg Wrachtrup +1 more

Fangzhou Jin, Weiping Liu, Hui Zhou

An efficient spin–photon interface plays a significant role in building quantum network and distributed quantum computing with solid-state spin system, e.g., nitrogen-vacancy (NV) center in diamond. Solid-state spin system has the advantages of excellent portability and long coherence time, however, it suffers from a critical drawback of low efficiency of spontaneously emitted photons in the zero phonon line. This poses a severe challenge for the generation of an efficient interface between solid-state spin and photon. Here, we propose a method to establish a coherent interface between photon and solid-state spin system which is coupled to a trapped ion via a quantum transducer. Our method provides a new route to establish an efficient spin–photon interface allowing the generation of entanglement between distant spins.

Paola Cappellaro, J. M. MAZE, Lilian Childress +12 more

Dirk Englund, Luozhou Li, J. S. Hodges +6 more

Optical nanocavities enable a strong interaction between single photons and single emitters. An appealing application is the construction of a quantum interface for photonic and solid state qubits. Since the material of the solid state qubit is often dierent from the nanocavity, there has been considerable interest in combining the two in a hybrid architecture. We describe our recent development of such a hybrid interface based a Gallium Phosphide photonic crystal nanocavity that is scanned and deterministically coupled to single emitters on a surface. The technique is used to couple the cavity to the nitrogen vacancy center in diamond, an emitter system with optically accessible electron spins and the ability to transfer electronic spin states to nuclear spins.

Julian M. Bopp, Matthias Plock, Tim Turan +3 more

Interfacing spin-active solid-state quantum emitters or memories with photons remains a challenging task due to photon losses. We propose and demonstrate the ‘Sawfish’ photonic crystal cavity to eliminate photon losses at spin-photon interfaces.

Fang-Yu Hong, Jing-Li Fu, Yan Wu +1 more