Bright Nitrogen-Vacancy Centers in Diamond Inverted Nanocones,ACS Photonics

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Bright Nitrogen-Vacancy Centers in Diamond Inverted Nanocones
ACS Photonics ( IF 6.5 ) Pub Date : 2020-09-02 , DOI: 10.1021/acsphotonics.0c00813
Seong-Woo Jeon ₁ , Junghyun Lee ₁ , Hojoong Jung ₁ , Sang-Wook Han ₁ , Young-Wook Cho ₁ , Yong-Su Kim ₁ , Hyang-Tag Lim ₁ , Yanghee Kim ₂ , Matthias Niethammer ₃ , Weon Cheol Lim ₂ , Jonghan Song ₂ , Shinobu Onoda ₄ , Takeshi Ohshima ₄ , Rolf Reuter ₃ , Andrej Denisenko ₃ , Joerg Wrachtrup ₃ , Sang-Yun Lee _{1,

5}

Affiliation

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.

中文翻译：

金刚石倒纳米锥中的明亮氮空位

具有长寿命量子存储器的量子发射器是一种有前途的可扩展量子系统，可用于基于转发器的量子通信，量子感测和分布式量子计算网络。尽管固体中的色心已获得成功，但实际使用中仍需要进一步提高光学控制和检测效率以及可扩展性。在这里，我们证明了单个的氮空位中心可以有效地耦合在金刚石倒置的纳米锥中，该锥可以通过使用实心圆锥形法拉第笼进行的全方向对角干法刻蚀直接在高质量CVD金刚石表面上制造。由于倒锥形的形状由于光子的单向引导而可以有效地收集光子，我们报告了单个发射器的光子收集效率提高了20倍，同时保留了很长的电子自旋相干时间。此外，我们显示可以通过使用常规的微探针头来拾取倒置的纳米锥，并以所需的方向放置在目标位置上。演示的结构还可以应用于其他固体中的类似发射器；因此，它可以用于寻找可伸缩光子量子器件的新可能性。

更新日期：2020-10-21

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