论文标题
电子介导的投影量量子非核能测量在核自旋上测量
Electron-mediated projective quantum nondemolition measurement on a nuclear spin
论文作者
论文摘要
投影量量子非座椅（QND）测量对于量子技术很重要。在这里，我们提出了一种通过测量弱超精细相互作用耦合的通用电子核自旋系统中的腋电子自旋，在核自旋上构建投影QND测量的方法。关键思想是在电子上应用合适的量子控制，以在核自旋上构建弱QND测量，然后将这些测量的序列级联级数级数。我们确定一组可调参数，以选择QND可观测值并控制弱QND测量的强度。我们还发现，可以针对现实的实验控制误差稳定QND测量。为了证明我们的方法，我们在$^{13} $ c核旋转上设计了投影QND测量，该旋转弱耦合到钻石中的氮气接种中心电子自旋。
Projective quantum nondemolition (QND) measurement is important for quantum technologies. Here we propose a method for constructing projective QND measurement on a nuclear spin via the measurement of an axillary electron spin in generic electron-nuclear spin systems coupled through weak hyperfine interaction. The key idea is to apply suitable quantum control on the electron to construct a weak QND measurement on the nuclear spin and then cascade a sequence of such measurements into a projective one. We identify a set of tunable parameters to select the QND observables and control the strength of the weak QND measurement. We also find that the QND measurement can be stabilized against realistic experimental control errors. As a demonstration of our method, we design projective QND measurement on a $^{13}$C nuclear spin weakly coupled to a nitrogen-vacancy center electron spin in diamond.
