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Symposium Latsis on Diamond Photonics - Physics, Technologies and Applications

Nanophotonics for telecom quantum networks based on neutral silicon vacancy centers in diamond

Ding Huang, Alex Abulnaga, Sacha Welinski, Zi-Huai Zhang, Paul Stevenson, Brendon C. Rose, Nathalie P. de Leon

Published Jan 1, 2019• 0 citations
Publisher

Abstract

Color centers in diamond are attractive candidates for implementing single-atom quantum memories in a quantum network. Recently, we reported a color center that exhibits favorable optical properties and long spin coherence times. The integration of this color center, SiV0, into nanophotonic circuits could enable efficient entanglement distribution over long distances.

DOI
10.1364/dp.2019.57

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Symposium Latsis on Diamond Photonics - Physics, Technologies and Applications•Jan 1, 2019•0 citations
Color centers in diamond are attractive candidates for implementing single-atom quantum memories in a quantum network. Recently, we reported a color center that exhibits favorable optical properties and long spin coherence times. The integration of this color center, SiV0, into nanophotonic circuits could enable efficient entanglement distribution over long distances.
Chapter 1 reviews recent advances towards the realization of quantum networks based on atom-like solid-state quantum emitters coupled to nanophotonic devices. Specifically, focus is on experiments involving the negatively charged silicon-vacancy color center in diamond. These emitters combine homogeneous, coherent optical transitions and a long-lived electronic spin quantum memory. Optical and spin properties of this system at cryogenic temperatures and experiments where silicon-vacancy centers are coupled to nanophotonic cavities are discussed. Finally, the chapter discusses experiments demonstrating quantum nonlinearities at the single-photon level and two-emitter entanglement in a single nanophotonic device.
Integrating atomic quantum memories based on color centers in diamond with on-chip photonic devices would enable entanglement distribution over long distances. However, efforts towards integration have been challenging because color centers can be highly sensitive to their environment, and their properties degrade in nanofabricated structures. Here, we describe a heterogeneously integrated, on-chip, III-V diamond platform designed for neutral silicon vacancy (SiV0) centers in diamond that circumvents the need for etching the diamond substrate. Through evanescent coupling to SiV0 centers near the surface of diamond, the platform will enable Purcell enhancement of SiV0 emission and efficient frequency conversion to the telecommunication C-band. The proposed structures can be realized with readily available fabrication techniques.
Large-scale quantum networks will enable entirely new applications of quantum information science in fields such as quantum communication, distributed quantum computing, sensing, and metrology. To build nodes of such networks, diamond color defects are one of the promising candidates. Their excellent optical properties, fast spin-qubit control, and long spin coherence times make them well-suited for quantum information processing and quantum memory applications. Additionally, recent advances in the heterogeneous integration of diamond nanophotonic structures with photonic integrated circuits have made these systems more efficient and well-suited for scalable quantum processor architectures. In this comprehensive review, we discuss the optical and spin properties of these systems, recent progress in the building blocks of quantum networks, and demonstrations of metropolitan-scale quantum networks, as well as the challenges associated with these systems at both the fundamental and experimental levels, along with potential solutions.
We review recent advances towards the realization of quantum networks based on atom-like solid-state quantum emitters coupled to nanophotonic devices. Specifically, we focus on experiments involving the negatively charged silicon-vacancy color center in diamond. These emitters combine homogeneous, coherent optical transitions and a long-lived electronic spin quantum memory. We discuss optical and spin properties of this system at cryogenic temperatures and describe experiments where silicon-vacancy centers are coupled to nanophotonic devices. Finally, we discuss experiments demonstrating quantum nonlinearities at the single-photon level and two-emitter entanglement in a single nanophotonic device.