Guo Yuhang, Ji Wentao, Kong Xi, Wang Mengqi, Sun Haoyu, Zhou Jingyang, Chai Zihua, Rong Xing, Shi Fazhan, Wang Ya, Du Jiangfeng
CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
Phys Rev Lett. 2024 Feb 9;132(6):060601. doi: 10.1103/PhysRevLett.132.060601.
Quantum systems usually feature a rich multilevel structure with promising resources for developing superior quantum technologies compared with their binary counterpart. Single-shot readout of these high-dimensional quantum systems is essential for exploiting their potential. Although there have been various high-spin systems, the single-shot readout of the overall state of high-spin systems remains a challenging issue. Here we demonstrate a reliable single-shot readout of spin qutrit state in a low-temperature solid-state system utilizing a binary readout scheme. We achieve a single-shot readout of an electron spin qutrit associated with a single nitrogen-vacancy center in diamond with an average fidelity of 87.80%. We use this spin qutrit system to verify quantum contextuality, a fundamental test of quantum mechanics. We observe a violation of the noncontextual hidden variable inequality with the developed single-shot readout in contrast to the conventional binary readout. These results pave the way for developing quantum information processing based on spin qutrits.
与二进制系统相比，量子系统通常具有丰富的多能级结构，拥有开发先进量子技术的诱人资源。对这些高维量子系统进行单次读出对于挖掘其潜力至关重要。尽管已经存在各种高自旋系统，但高自旋系统整体状态的单次读出仍然是一个具有挑战性的问题。在此，我们展示了一种利用二进制读出方案在低温固态系统中对自旋三量子比特态进行可靠单次读出的方法。我们实现了与金刚石中单个氮空位中心相关的电子自旋三量子比特的单次读出，平均保真度为87.80%。我们使用这个自旋三量子比特系统来验证量子非定域性，这是量子力学的一项基本测试。与传统的二进制读出相比，我们利用所开发的单次读出观察到了对非定域隐变量不等式的违背。这些结果为基于自旋三量子比特开发量子信息处理铺平了道路。
