论文标题
在较强的超精细相互作用下，理想的重新聚焦于光学主动的自旋值
Ideal refocusing of an optically active spin qubit under strong hyperfine interactions
论文作者
论文摘要
将高度连贯的自旋控制与有效的光结合结合在一起，为量子通信和网络以及量子计算提供了绝佳的机会。光学活性的半导体量子点具有无与伦比的光子性能，但也受其常驻核的限制旋转相干性。在这里，我们证明，使用晶状体匹配的GAAS-Algaas量子点设备消除应变不均匀性，可将电子自旋连贯性延长近两个数量级，超过0.113（3）ms。为此，我们利用光学pulse门的99.30（5）％的保真度来实施动力学解耦。我们将解耦脉冲的数量变化为n = 81，并找到N^{0.75（2）}的连贯时间缩放。这种缩放表现出了电子与核旋转合奏之间强烈相互作用的理想重新聚焦，并具有寿命受限的自旋连贯性的希望。我们的发现表明，此类量子点设备最惩罚的物质科学挑战具有一种补救措施，构成了高度相干的自旋式接口的基础。
Combining highly coherent spin control with efficient light-matter coupling offers great opportunities for quantum communication and networks, as well as quantum computing. Optically active semiconductor quantum dots have unparalleled photonic properties, but also modest spin coherence limited by their resident nuclei. Here, we demonstrate that eliminating strain inhomogeneity using lattice-matched GaAs-AlGaAs quantum dot devices prolongs the electron spin coherence by nearly two orders of magnitude, beyond 0.113(3) ms. To do this, we leverage the 99.30(5)% fidelity of our optical pi-pulse gates to implement dynamical decoupling. We vary the number of decoupling pulses up to N = 81 and find a coherence time scaling of N^{0.75(2)}. This scaling manifests an ideal refocusing of strong interactions between the electron and the nuclear-spin ensemble, holding the promise of lifetime-limited spin coherence. Our findings demonstrate that the most punishing material science challenge for such quantum-dot devices has a remedy, and constitute the basis for highly coherent spin-photon interfaces.
