论文标题
量子光子学的低噪声GAAS量子点
Low-Noise GaAs Quantum Dots for Quantum Photonics
论文作者
论文摘要
量子点既是单旋转的极好的单光子源和宿主。这种组合使拉曼 - 光子的确定性生成 - 带宽与原子量子 - 内存 - 以及光子簇状态的生成，这是一种基于量子通信和基于测量的量子计算的资源。与广泛使用的Ingaas量子点相比，藻类中的GAAS量子点可以以频率与基于Rubidium的光子记忆匹配，并且具有可能改善的电子自旋连贯性。但是，它们的充电稳定性和光学宽度通常比Ingaas对应物要差得多。在这里，我们将GAAS量子点嵌入到$ n $ -I $ - $ $ p $ - 专为低温操作而设计的二极管中。我们演示了超低噪声行为：通过库仑阻塞，近距离寿命限制的线宽和无眨眼的电荷控制。我们观察到这些量子点的高保真光学电子旋转初始化和长电子旋转寿命。我们的工作建立了一个靠近频谱红色部分的低噪声量子光子学的材料平台。
Quantum dots are both excellent single-photon sources and hosts for single spins. This combination enables the deterministic generation of Raman-photons -- bandwidth-matched to an atomic quantum-memory -- and the generation of photon cluster states, a resource in quantum communication and measurement-based quantum computing. GaAs quantum dots in AlGaAs can be matched in frequency to a rubidium-based photon memory, and have potentially improved electron spin coherence compared to the widely used InGaAs quantum dots. However, their charge stability and optical linewidths are typically much worse than for their InGaAs counterparts. Here, we embed GaAs quantum dots into an $n$-$i$-$p$-diode specially designed for low-temperature operation. We demonstrate ultra-low noise behaviour: charge control via Coulomb blockade, close-to lifetime-limited linewidths, and no blinking. We observe high-fidelity optical electron-spin initialisation and long electron-spin lifetimes for these quantum dots. Our work establishes a materials platform for low-noise quantum photonics close to the red part of the spectrum.
