Efficient Pulse‐Excitation Techniques for Single Photon Sources from Quantum Dots in Optical Cavities
Efficient Pulse‐Excitation Techniques for Single Photon Sources from Quantum Dots in Optical Cavities
复制标题
光腔中量子点单光子源的高效脉冲激发技术
DOI：
10.1002/qute.201900073
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发表时间：
2019
影响因子：
4.4
通讯作者：
S. Hughes
中科院分区：
文献类型：
--
作者：
Chris Gustin;S. Hughes
提出了严格而直观的主方程模型，用于研究耦合到光学腔的脉冲激发量子点的按需单光子源。考虑了三种源激发方法：共振π脉冲、非共振声子辅助反转和双激子-激子级联的双光子激发，并研究了脉冲激发过程对发射光子的量子不变性、效率和纯度的影响。通过以捕获与光子和声子库耦合相关的非马尔可夫效应的方式明确地对时间相关的脉冲激发过程进行建模，发现对于所有这些方案，可以以超过90%的效率发射具有接近统一不可逆性的光子，其中非共振方案由于激发脉冲的频率分离而不一定需要偏振滤波，并且允许非常高的单光子纯度。此外，非共振方法在某些参数范围内具有鲁棒性，特别是对激励脉冲持续时间的要求不太严格。此外，主方程的半解析简化导出的非共振驱动，这给洞察的重要作用，激子-声子解耦的强驱动器中发挥的非共振声子辅助反转过程。
Rigorous and intuitive master equation models are presented to study on‐demand single photon sources from pulse‐excited quantum dots coupled to optical cavities. Three methods of source excitation are considered: resonant pi‐pulse, off‐resonant phonon‐assisted inversion, and two‐photon excitation of a biexciton–exciton cascade, and the effect of the pulse excitation process on the quantum indistinguishability, efficiency, and purity of emitted photons is investigated. By explicitly modelling the time‐dependent pulsed excitation process in a manner which captures non‐Markovian effects associated with coupling to photon and phonon reservoirs, it is found that photons of near‐unity indistinguishability can be emitted with over 90% efficiency for all these schemes, with the off‐resonant schemes not necessarily requiring polarization filtering due to the frequency separation of the excitation pulse, and allowing for very high single photon purities. Furthermore, the off‐resonant methods are shown to be robust over certain parameter regimes, with less stringent requirements on the excitation pulse duration in particular. Also, a semi‐analytical simplification of the master equation is derived for the off‐resonant drive, which gives insight into the important role that exciton–phonon decoupling for a strong drive plays in the off‐resonant phonon‐assisted inversion process.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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