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Conference on Lasers and Electro-Optics

Frequency Tunable Single-Photon Emission From a Single Atomic Defect in a Solid

Shuo Sun, Jingyuan Linda Zhang, Kevin A. Fischer, Michael J. Burek, Constantin Dory, Konstantinos G. Lagoudakis, Yan‐Kai Tzeng, Marina Radulaski, Yousif Kelaita, Amir H. Safavi‐Naeini, Zhi‐Xun Shen, Nicholas A. Melosh, Steven Chu, Marko Lončar, Jelena Vuckovic A

Published May 5, 2019• 0 citations
Publisher

Abstract

We demonstrate generation of frequency tunable single-photon emission based on cavity-enhanced Raman emission from a single silicon-vacancy center in diamond. The demonstrated frequency tuning range (100 GHz) significantly exceeds the spectral inhomogeneity of the emitters. © 2019 The Author(s)
DOI
10.23919/cleo.2019.8750676

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Sources of individual photons have applications in quantum cryptography, computation, and metrology, but truly scalable sources are still needed. The authors couple silicon-vacancy centers to a high-QQQ microcavity, yielding a room-temperature source with the potential for high efficiency, brightness, and spectral purity. This setup improves spectral density by more than two orders of magnitude and could offer single-photon rates above 1 GHz, as well as generation of indistinguishable photons.
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A key requirement for many applications in solid-state quantum sciences is a high fluence of indistinguishable photons. The spontaneous emission of these photons is governed by the coupling of an excited quantum system to electromagnetic vacuum fluctuations. In our experiment, we enhance this coupling by engineering a tunable Fabry-Perot microcavity. The quantum system we study is the nitrogen-vacancy (NV) center in diamond, a workhorse for quantum science and engineering, due to its optical transitions and the coherent electron spin system it hosts. Our device consists of a high-quality, nano-fabricated, single-crystalline diamond membrane bonded to a planar mirror; the cavity is completed by a second, concave mirror. Using piezo positioners, we achieve full spectral and spatial tunability and freedom in selecting NVs with favorable emission properties in our low-temperature (4 Kelvin) experiments. Upon tuning of the cavity into resonance, we find significant enhancement of the 637 nm zero phonon line for several individual NVs which is accompanied by a strong reduction of the overall photoluminescence (PL) lifetime. We infer a 30-fold enhancement of the zero-phonon transition rate at best. The fraction of the PL emission associated to this resonant transition is thereby increased from 3% to 46%. Our results constitute a significant leap on the route towards the implementation of fast long-distance quantum networks, which are currently limited by the photon emission rate in their nodes. Furthermore, our versatile design is readily applicable to other solid-state quantum emitters like color centers in silicon carbide.