Abstract: Color centers that combine a long-lived spin state and a spin-photon interface have the potential for modular quantum computing, where the scalability of electron-nuclear registers is achieved via photon-mediated long-distance interactions. One of the challenges for implementing this is the scalability of the photonic circuits due to limitations of cryogenic environments and restrictions placed by the device yield. We will present an approach towards multi-emitter quantum devices based on high-finesse microcavities whose architecture combines strong light-matter interactions, low material strain, excellent mechanical stability in cryogenic environments, and the potential for programmable addressing of many color centers in a single device.

We will begin with a background on color centers in semiconductors as scalable spin-photon interfaces, focusing on the development of the Silicon Carbide on Insulator quantum photonics platform. We will then discuss recent demonstrations of two emitter interference in a single SiC quantum device, and new entanglement protocols that can be leveraged with whispering gallery mode resonators. Finally, we will share preliminary experimental results on cavity interactions of a small ensemble of emitters.  We hope that our approach may provide a near-term path towards studying multi-emitter cavity QED physics in the solid state, as well as the implementation of an on-chip quantum network of nuclear spin registers. 

Biography: Daniil Lukin completed his PhD at Stanford University in 2022 with Prof. Jelena Vuckovic developing Silicon Carbide for quantum and classical photonics applications. He remained at Stanford as a postdoc, working with Prof. Vuckovic to explore multi-emitter cavity quantum electrodynamics in the solid state. His research is split between experimental research in the optics lab and in the nanofabrication facilities. He began work in the nanofab as an undergraduate at Caltech with Prof. Axel Scherer and continues to greatly enjoy hands-on nanotechnology work at Stanford 10 years later. To impart excitement for light in the younger generation, for one week every summer, Daniil teaches experimental optics at SigmaCamp, a summer camp for middle and high school students.

This seminar is sponsored by the Department of Applied Physics and the Ginzton Laboratory