Solid-state single photon source with Fourier transform limited lines at room temperature
Solid-state single photon source with Fourier transform limited lines at room temperature
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DOI：
10.1103/physrevb.101.081401
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发表时间：
2020-02-05
影响因子：
3.7
通讯作者：
Kubanek, A.
中科院分区：
文献类型：
--
作者：
Dietrich, A.;Doherty, M. W.;Kubanek, A.
具有傅里叶变换（FT）限制线的固态单光子源是光子量子技术中最关键的组成部分之一，因此在过去几十年中一直是深入研究的焦点。然而，到目前为止，由于与晶格声子的热浴的强相互作用，固态系统仅在低温下表现出FT限制线。在这个快速通信，我们报告了一个固态源，表现出FT有限的线测量光致发光激发（次100 MHz线宽）从3至300 K。所研究的源是在二维六方氮化硼的色心，我们提出，该中心的声子去耦是材料的低维的一个基本后果。虽然该中心的发光线表现出光谱扩散，我们确定了可能的扩散源，并建议通过动态光谱调谐来减轻它。在室温下发现FT极限线，一旦光谱扩散得到控制，也将产生FT极限发射。我们的工作推动了室温光子量子技术的重大进展，并在二维材料的显着基本特性方面开辟了不同的研究方向。
Solid-state single photon sources with Fourier transform (FT) limited lines are among the most crucial constituents of photonic quantum technologies and have been accordingly the focus of intensive research over the last several decades. However, so far, solid-state systems have only exhibited FT limited lines at cryogenic temperatures due to strong interactions with the thermal bath of lattice phonons. In this Rapid Communication, we report a solid-state source that exhibits FT limited lines measured in photoluminescence excitation (sub-100-MHz linewidths) from 3 to 300 K. The studied source is a color center in the two-dimensional hexagonal boron nitride and we propose that the center's decoupling from phonons is a fundamental consequence of the material's low dimensionality. While the center's luminescence lines exhibit spectral diffusion, we identify the likely source of the diffusion and propose to mitigate it via dynamic spectral tuning. The discovery of FT limited lines at room temperature, which once the spectral diffusion is controlled, will also yield FT limited emission. Our work motivates a significant advance towards room-temperature photonic quantum technologies and a different research direction in the remarkable fundamental properties of two-dimensional materials.