Review on coherent quantum emitters in hexagonal boron nitride
Review on coherent quantum emitters in hexagonal boron nitride
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六方氮化硼相干量子发射器研究进展
DOI：
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发表时间：
2022
期刊：
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通讯作者：
A. Kubanek
中科院分区：
文献类型：
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作者：
A. Kubanek
六方氮化硼是一种新兴的二维材料，在纳米光子学或纳米机械等领域有着广泛的应用。它的层状结构对范德华异质结等新材料起着关键作用。层状结构对于托管的光学活性缺陷中心也具有独特的含义。一种非常特殊类型的缺陷中心产生于存在位于两层之间的机械隔离轨道的可能性。由此产生的对低频声学声子的耦合被证明是保护光学跃迁的相干性不受与环境的机械作用的基本因素。因此，即使在室温下，光谱跃迁线宽仍然非常窄，从而为环境条件下的相干量子光学铺平了一条新的道路。在这篇综述中，我总结了六方氮化硼中缺陷中心的研究现状，重点介绍了光学相干缺陷中心。我讨论了目前对缺陷中心的理解、存在的问题以及克服普遍存在的挑战的潜在研究方向。该领域被放在一个广阔的前景中，对量子光学、量子光子学以及自旋光学等量子技术产生了影响。
Hexagonal boron nitride is an emerging two-dimensional material with far-reaching applications in fields like nanophotonics or nanomechanics. Its layered architecture plays a key role for new materials such as Van der Waals heterostructures. The layered structure has also unique implications for hosted, optically active defect centers. A very special type of defect center arises from the possibility to host mechanically isolated orbitals localized between the layers. The resulting absence of coupling to low-frequency acoustic phonons turns out to be the essential element to protect the coherence of optical transitions from mechanical interactions with the environment. Consequently, the spectral transition linewidth remains unusually narrow even at room temperature, thus paving a new way towards coherent quantum optics under ambient conditions. In this review, I summarize the state-of-the-art of defect centers in hexagonal boron nitride with a focus on optically coherent defect centers. I discuss the current understanding of the defect centers, remaining questions and potential research directions to overcome pervasive challenges. The field is put into a broad perspective with impact on quantum technology such as quantum optics, quantum photonics as well as spin optomechanics.