Quantum Interference of Resonance Fluorescence from Germanium-Vacancy Color Centers in Diamond
Quantum Interference of Resonance Fluorescence from Germanium-Vacancy Color Centers in Diamond
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DOI：
10.1021/acs.nanolett.2c01959
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发表时间：
2022-08-10
期刊：
影响因子：
10.8
通讯作者：
Gao, Weibo
中科院分区：
文献类型：
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作者：
Chen, Disheng;Froch, Johannes E.;Gao, Weibo
来自量子发射器的共振荧光是提取不可区分光子的理想来源。利用交叉偏振抑制激光散射，在低温下观察到了GeV级金刚石色心的共振荧光。傅里叶变换限制的线宽发射与T-2/2 T（1）类似于0.86，允许基于单个GeV色心的双光子干涉。在脉冲激发下，分离的光子表现出超过经典极限的Hong-Ou-Mandel量子干涉，而连续波激发导致1.05辐射寿命的合并时间窗口。此外，我们证明了一个单一的拍摄读出的自旋状态的保真度为74%。我们的实验为在金刚石中构建GeV色心量子网络奠定了基础。
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 T-2/2T(1) similar to 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.