金刚石中锗空位色心共振荧光的量子干涉
Quantum Interference of Resonance Fluorescence from Germanium-Vacancy Color Centers in Diamond.
作者信息
Chen Disheng, Fröch Johannes E, Ru Shihao, Cai Hongbing, Wang Naizhou, Adamo Giorgio, Scott John, Li Fuli, Zheludev Nikolay, Aharonovich Igor, Gao Weibo
机构信息
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
The Photonics Institute and Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore.
出版信息
Nano Lett. 2022 Aug 10;22(15):6306-6312. doi: 10.1021/acs.nanolett.2c01959. Epub 2022 Aug 1.
Resonance fluorescence from a quantum emitter is an ideal source to extract indistinguishable photons. By using the cross-polarization to suppress the laser scattering, we observed resonance fluorescence from GeV color centers in diamond at cryogenic temperature. The Fourier-transform-limited line width emission with /2 ∼ 0.86 allows for two-photon interference based on single GeV color center. Under pulsed excitation, the separated photons exhibit a Hong-Ou-Mandel quantum interference above classical limit, whereas the continuous-wave excitation leads to a coalescence time window of 1.05 radiative lifetime. In addition, we demonstrated a single-shot readout of spin states with a fidelity of 74%. Our experiments lay down the foundation for building a quantum network with GeV color centers in diamond.
来自量子发射器的共振荧光是提取不可区分光子的理想光源。通过利用交叉极化来抑制激光散射，我们在低温下观测到了金刚石中GeV色心的共振荧光。/2 ∼ 0.86的傅里叶变换极限线宽发射使得基于单个GeV色心的双光子干涉成为可能。在脉冲激发下，分离的光子表现出高于经典极限的Hong-Ou-Mandel量子干涉，而连续波激发导致1.05个辐射寿命的合并时间窗口。此外，我们展示了保真度为74%的自旋态单次读出。我们的实验为构建基于金刚石中GeV色心的量子网络奠定了基础。
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