Cascaded Cavities Boost the Indistinguishability of Imperfect Quantum Emitters
Cascaded Cavities Boost the Indistinguishability of Imperfect Quantum Emitters
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DOI：
10.1103/physrevlett.122.183602
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发表时间：
2019-05-10
影响因子：
8.6
通讯作者：
Englund, Dirk
中科院分区：
文献类型：
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作者：
Choi, Hyeongrak;Zhu, Di;Englund, Dirk
最近，Grange等人[Phys. Rev. Lett. 114，193601（2015）]显示了尽管强的纯退相，但通过向光子腔中的“漏斗”发射，从量子发射体产生具有高不可逆性的单光子的可能性。在这里，我们表明，级联双腔系统可以进一步改善光子特性，并大大降低Q因子的要求与当今的技术可达到的水平。我们的方法利用了纳米腔的最新进展，具有超小的模体积，并且不需要发射器的超快激发。这些结果是通过具有强发射体失相的数值和封闭形式的分析模型获得的，代表室温量子发射体。
Recently, Grange et al. [Phys. Rev. Lett. 114, 193601 (2015)] showed the possibility of single-photon generation with a high indistinguishability from a quantum emitter despite strong pure dephasing, by "funneling" emission into a photonic cavity. Here, we show that a cascaded two-cavity system can further improve the photon characteristics and greatly reduce the Q factor requirement to levels achievable with present-day technology. Our approach leverages recent advances in nanocavities with an ultrasmall mode volume and does not require ultrafast excitation of the emitter. These results were obtained by numerical and closed-form analytical models with strong emitter dephasing, representing room-temperature quantum emitters.