量子点SUPER激发的输入-输出分析
Input-Output Analysis of Quantum Dot SUPER Excitation
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中文总结 AI 辅助
本研究对量子点SUPER双色脉冲激发机制进行全量子输入-输出分析，揭示其非线性三光子拉曼特征，扩展量子输入-输出形式并验证高光子数下可实现高保真布居反转。
中文摘要 AI 辅助
量子发射体布居的SUPER双色脉冲激发方案，仅用红失谐光即可实现对二能级量子发射体的鲁棒激发，激发效率接近100%。我们针对两个相干自由空间输入脉冲处于实际光子数的情况，采用对入射和出射光脉冲的全量子输入-输出描述，分析其违背直觉的 underlying dynamics。在微观层面，SUPER机制呈现出非线性三光子拉曼型特征，导致一个模式的净光子数变化为-2，另一个模式为+1，这一特征最初是从低光子数下的腔增强模型描述中推测得出的。我们确认，在自由空间中，要实现高保真度的布居反转，需要足够高的脉冲光子数，远大于1。为处理与SUPER相关的大相干态振幅（光子数），我们将量子输入-输出形式扩展为包含累积量展开方法。结合相互作用绘表述，支配非平凡动力学的少量交换光子，使得在截断希尔伯特空间中可进行直接的全量子计算，包括位移框架和初始福克态脉冲的处理。
英文摘要
The Swing-UP of the quantum EmitteR population (SUPER) two-color pulsed excitation scheme allows for robust and close to 100\% excitation of a two-level quantum emitter using only red detuned light. We analyze the underlying counterintuitive dynamics using a full quantum input-output description of the in- and outgoing light pulses for the case of two coherent free-space input pulses at realistic photon numbers. At the microscopic level, the SUPER mechanism exhibits its nonlinear three-photon Raman-type character, leading to a net photon-number change of $-2$ in one mode and $+1$ in the other, as was first guessed from cavity-enhanced model descriptions at low photon numbers. We confirm that in free space, a sufficiently high pulse photon number, much larger than one, is required to achieve high-fidelity inversion. To treat the large coherent-state amplitudes (photon numbers) relevant for SUPER, we extend the quantum input-output formalism to include a cumulant expansion approach. With an interaction-picture formulation, the few exchanged photons that govern the nontrivial dynamics enable direct full-quantum calculations in truncated Hilbert spaces, including treatments in a displacement frame and for initial Fock-state pulses.
