Abstract
Color centers are point defects in crystals that can provide an optical interface to a long-lived spin state for distributed quantum information processing applications. An outstanding challenge for color center quantum technologies is the integration of optically coherent emitters into scalable thin-film photonics, a prerequisite for large-scale photonics integration of color centers within a commercial foundry process. Here, we report on the integration of near-transform-limited silicon vacancy () defects into microdisk resonators fabricated in a CMOS-compatible -silicon carbide-on-insulator platform. We demonstrate a single-emitter cooperativity of up to 0.8 as well as optical superradiance from a pair of color centers coupled to the same cavity mode. We investigate the effect of multimode interference on the photon scattering dynamics from this multiemitter cavity quantum electrodynamics system. These results are crucial for the development of quantum networks in silicon carbide and bridge the classical-quantum photonics gap by uniting optically coherent spin defects with wafer-scalable, state-of-the-art photonics.
- Received 6 May 2022
- Accepted 16 December 2022
DOI:https://doi.org/10.1103/PhysRevX.13.011005
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Published by the American Physical Society
Physics Subject Headings (PhySH)
Popular Summary
Color centers are point defects in crystals that can behave like artificial atoms trapped inside a “semiconductor vacuum.” Color centers that possess long-lived, spin-state quantum memories and can emit spin-selective photons are candidates for quantum information applications, including quantum communications and network-based quantum computation. One of the technological advantages of quantum information processing with color centers is the potential for integration into scalable photonic devices. However, an outstanding challenge has been to demonstrate optically coherent color centers in thin-film photonics, which is a prerequisite for scalable, foundry-compatible photonics processing. Here, we demonstrate the integration of an optically coherent, long-lived spin qubit into wafer-scalable photonics.
We integrate optically coherent color centers into a photonic resonator based on the silicon carbide-on-insulator semiconductor photonics platform. The photonic resonator enhances the emission of the color centers, increasing their brightness and the indistinguishability of the emitted photons. This enables us to show, for the first time, the photon interference between two color centers in silicon carbide. The multimode nature of our photonic resonator enables unique in situ emitter entanglement protocols based on single-photon interference within the resonator. Toward this end, we also demonstrate chiral photon scattering properties of the resonator-coupled two-emitter system.
Our work demonstrates the potential of silicon carbide as a thin-film, scalable quantum photonics platform for applications in quantum computing and quantum communications.
