Laser writing of coherent colour centres in diamond
Laser writing of coherent colour centres in diamond
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DOI：
10.1038/nphoton.2016.234
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发表时间：
2017-02-01
期刊：
影响因子：
35
通讯作者：
Smith, Jason M.
中科院分区：
文献类型：
--
作者：
Chen, Yu-Chen;Salter, Patrick S.;Smith, Jason M.
晶体中的光活性点缺陷作为一种可以应用于量子信息技术的光子系统已经得到了广泛的关注（1,2）。然而，挑战仍然存在于将单个缺陷放置在所需位置，这是设备制造的基本要素。在这里，我们报道了利用激光刻写技术在金刚石中可控地生成单负电荷氮空位（NV-）中心(3)。书写光学中的像差校正允许在金刚石晶体内精确定位空位，随后的退火产生单个NV-中心，成功率高达45 +/- 15%，位于横向平面上所需位置的约200 nm内。选定的NV-中心在低温下显示稳定、相干的光学跃迁，这是创建固态量子比特的分布式量子网络的先决条件。结果表明，激光写入作为量子技术缺陷工程新工具的潜力，并将激光加工扩展到单缺陷领域。
Optically active point defects in crystals have gained widespread attention as photonic systems that could be applied in quantum information technologies(1,2). However, challenges remain in the placing of individual defects at desired locations, an essential element of device fabrication. Here we report the controlled generation of single negatively charged nitrogen vacancy (NV-) centres in diamond using laser writing(3). Aberration correction in the writing optics allows precise positioning of the vacancies within the diamond crystal, and subsequent annealing produces single NV- centres with a probability of success of up to 45 +/- 15%, located within about 200 nm of the desired position in the transverse plane. Selected NV- centres display stable, coherent optical transitions at cryogenic temperatures, a prerequisite for the creation of distributed quantum networks of solid-state qubits. The results illustrate the potential of laser writing as a new tool for defect engineering in quantum technologies, and extend laser processing to the single-defect domain.