Bright Nitrogen-Vacancy Centers in Diamond Inverted Nanocones
- Bright Nitrogen-Vacancy Centers in Diamond Inverted Nanocones
- 송종한; 임원철; 한상욱; 김용수; 조영욱; 정호중; 임향택; 김양희; 이정현; 전승우; Matthias Niethammer; Shinobu Onoda; Takeshi Ohshima; Rolf Reuter; Andrej Denisenko; Joerg Wrachtrup; 이상윤
- Issue Date
- ACS photonics
- VOL 7, NO 10-2747
- Quantum emitters with long-lived quantum memories are a promising scalable quantum system for repeater-based quantum communications, quantum sensing, and distributed quantum computing networks. Although color centers in solids have been successful, further improvements in the efficiency of optical control and detection and scalability are necessary for practical uses. Here, we demonstrate that single nitrogen-vacancy centers can be efficiently coupled in diamond inverted nanocones that can be fabricated directly on the high-quality CVD diamond surface by the all-direction diagonal dry etching using a solid cone-shaped Faraday cage. Since the inverted cone shape allows efficient photon collection thanks to the single-directional guiding of photons, we report 20-fold enhancement in the photon collection efficiency from a single emitter while preserving a long electron spin coherence time. Furthermore, we show that an inverted nanocone can be picked and placed on the target position with desired orientation by using conventional microprobe tips. The demonstrated structure can also be applied to similar emitters in other solids; thus, it can be used for finding new possibilities for scalable photonic quantum devices.
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