AI 中文总结
该研究证实，分子束外延生长的原生InAsP/InP量子点在失谐准共振激发下可产生不可区分通信波段单光子，为量子光源制备提供了新的可行方案。
AI 中文摘要
本研究在失谐准共振激发下，对原生InAsP/InP量子点（工作于第三通信窗口）展开研究。32 meV的大激发-发射失谐可高效抑制散射激光，同时保留近共振激发的多项优势。通过Hanbury Brown and Twiss实验确认了发射光的单光子特性，测得原始二阶自关联值为$g_{\rm raw}^{(2)}(0)=0.076(6)$；采用Hong-Ou-Mandel测量确定单光子的不可区分度，当激发脉冲间隔分别为13.1 ns和5.3 ns时，测得的可见度为$V=0.094(4)$和$V=0.106(5)$。这些结果表明，通过分子束外延生长的原生InAsP/InP量子点，在实验要求较低的失谐激发下，具备产生不可区分通信波段单光子的潜力，后续可通过光腔中的珀塞尔增强实现进一步提升。
英文摘要
In this study, we investigate as-grown InAsP/InP quantum dots emitting in the third telecommunication window under detuned quasi-resonant excitation. A large excitation-emission detuning of 32 meV enables efficient suppression of scattered laser light while retaining several advantages of near-resonant excitation. The single-photon nature of the emission is confirmed by a Hanbury Brown and Twiss experiment, yielding a raw second-order autocorrelation value of $g_{\mathrm{raw}}^{(2)}(0)=0.076(6)$. Hong-Ou-Mandel measurement is used to determine the degree of indistinguishability of single photons and reveal as measured visibilities of $V=0.094(4)$ and $V=0.106(5)$ for excitation pulse separations of 13.1 ns and 5.3 ns, respectively. These results demonstrate the potential of as-grown InAsP/InP quantum dots grown via molecular beam epitaxy under not experimentally demanding detuned excitation for generating indistinguishable telecom single photons. Further improvements are to be achieved through Purcell enhancement in optical cavities.
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