论文标题
六角硼硝化硼的量子发射极的两光子干扰
Two-photon interference from a quantum emitter in hexagonal boron nitride
论文作者
论文摘要
最近发现的二维（2D）材料中发现的量子发射器已经打开了集成光子设备的新观点，以获取量子信息。这些应用中的大多数要求发射的光子无法区分，这在2D材料中仍然难以捉摸。在这里，我们研究了使用电子束在六角硼（HBN）中产生的量子发射极的两光子干扰。我们在非共振激发下测量hong-ou-mandel（HOM）干涉仪中零phon-line光子的相关性。我们发现，发射的光子在3 ns的时间窗口中表现出$ 0.44 \ pm 0.11 $的部分不可区分性，该窗口对应于$ 0.56 \ pm 0.11 $的校正值，因为它考虑了不完善的发射器纯度。 HOM可见性对截图后窗口的宽度的依赖性使我们能够估计发射极的时间为$ \ sim 1.5 $ ns，约为自发排放设置的限制的一半。使用Purcell效应具有最新的2D材料光子学，可见度高于90％。
Recently discovered quantum emitters in two-dimensional (2D) materials have opened new perspectives of integrated photonic devices for quantum information. Most of these applications require the emitted photons to be indistinguishable, which has remained elusive in 2D materials. Here, we investigate two-photon interference of a quantum emitter generated in hexagonal boron nitride (hBN) using an electron beam. We measure the correlations of zero-phonon-line photons in a Hong-Ou-Mandel (HOM) interferometer under non-resonant excitation. We find that the emitted photons exhibit a partial indistinguishability of $0.44 \pm 0.11$ in a 3 ns time window, which corresponds to a corrected value of $0.56 \pm 0.11$ after accounting for imperfect emitter purity. The dependence of the HOM visibility on the width of the post-selection time window allows us to estimate the dephasing time of the emitter to be $\sim 1.5$ ns, about half the limit set by spontaneous emission. A visibility above 90 % is under reach using Purcell effect with up-to-date 2D material photonics.
