Spectral stabilization and indistinguishible photon generation by electromechanical tuning of diamond color centers in nanophotonic devices*

Silicon-vacancy (SiV) color centers in diamond have excellent optical properties and spin coherence properties, making them ideal candidates for integration into quantum networks. However, their applications are limited by their spectral inhomogeneity and diffusion when implanted within nanophotonic devices. We present a platform for nano-electromechanically stabilizing and tuning the SiV spectral lines inside waveguides and cavities with emitter tuning range 3 times larger than the SiV inhomogeneous distribution. As demonstration of this platform's capabilities, we tune two, waveguide coupled SiV color centers into resonance using strain and generate an entangled superradiant state between them. We demonstrate that this technique can be used for broad bandwidth suppresion of spectral diffusion and to drive spectral lines with 10s of MHz bandwidth. Our platform for cavity coupled, individually tunable solid state quantum emitters with long coherence times should allow for controllable interactions between emitters and is a step towards the creation of a quantum repeater network.