论文标题
在宽带光子晶体波导中
Near Transform-limited Quantum Dot Linewidths in a Broadband Photonic Crystal Waveguide
论文作者
论文摘要
平面纳米光子结构使宽带能够从嵌入其中的量子点中发射的近乎统一耦合，从而意识到理想的新闻源。单光子源的效率和连贯性受电荷噪声的限制，这会导致发射光谱的扩大。我们通过在含有$ p $ p $ i $ i $ n $ n $ n $ diode的$ p $ i $ i $ n $ n $ diode中嵌入的量子点的光子晶体膜中制造光子晶体波导来报告噪声的抑制。波导附近的局部电触点最小化泄漏电流，并允许量子点共振的快速电控制（$ \ $ 4 MHz带宽）。在6 nm宽的发射波长范围内，与光子晶体波导耦合到光子晶体波导的谐振线宽测量值$ 79 $量子点接近变换限制的发射。重要的是，局部电触点允许在同一芯片上独立调整多个量子点，而这些芯片与变换限制的发射是实现基于多emitter的量子信息处理的关键组成部分。
Planar nanophotonic structures enable broadband, near-unity coupling of emission from quantum dots embedded within, thereby realizing ideal singe-photon sources. The efficiency and coherence of the single-photon source is limited by charge noise, which results in the broadening of the emission spectrum.We report suppression of the noise by fabricating photonic crystal waveguides in a gallium arsenide membrane containing quantum dots embedded in a $p$-$i$-$n$ diode. Local electrical contacts in the vicinity of the waveguides minimize the leakage current and allow fast electrical control ($\approx$4 MHz bandwidth) of the quantum dot resonances. Resonant linewidth measurements of $79$ quantum dots coupled to the photonic crystal waveguides exhibit near transform-limited emission over a 6 nm wide range of emission wavelengths. Importantly, the local electrical contacts allow independent tuning of multiple quantum dots on the same chip, which together with the transform-limited emission are key components in realizing multiemitter-based quantum information processing.
