Jeon, Seong-Woo Lee, Junghyun Jung, Hojoong Han, Sang-Wook Cho, Young-Wook Kim, Yong-Su Lim, Hyang-Tag Kim, Yanghee Niethammer, Matthias Lim, Weon Cheol Song, Jonghan Onoda, Shinobu Ohshima, Takeshi Reuter, Rolf Denisenko, Andrej Wrachtrup, Joerg Lee, Sang-Yun 2024-01-19T16:31:10Z 2024-01-19T16:31:10Z 2021-09-02 2020-10-21 2330-4022 https://pubs.kist.re.kr/handle/201004/117982 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 alldirection 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. English AMER CHEMICAL SOC SINGLE-PHOTON SOURCES QUANTUM EMITTERS SPIN ENTANGLEMENT SPECTROSCOPY INTEGRATION PLATFORM QUBITS LIGHT Bright Nitrogen-Vacancy Centers in Diamond Inverted Nanocones Article 10.1021/acsphotonics.0c00813 1 ACS PHOTONICS, v.7, no.10, pp.2739 - 2747 ACS PHOTONICS 7 10 2739 2747 scie scopus 000584945700013 2-s2.0-85096497933 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Optics Physics, Applied Physics, Condensed Matter Science & Technology - Other Topics Materials Science Optics Physics Article SINGLE-PHOTON SOURCES QUANTUM EMITTERS SPIN ENTANGLEMENT SPECTROSCOPY INTEGRATION PLATFORM QUBITS LIGHT diamond diamond inverted nanocone nitrogen-vacancy center solid-state single photon source quantum information processing quantum sensing