Lin Mu-Che, Lo Ping-Yuan, Nori Franco, Chen Hong-Bin
Department of Engineering Science, National Cheng Kung University, Tainan 701401, Taiwan.
Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan.
J Phys Condens Matter. 2022 Nov 1;34(50). doi: 10.1088/1361-648X/ac9bbe.
The ongoing exploration of the ambiguous boundary between the quantum and the classical worlds has spurred substantial developments in quantum science and technology. Recently, the nonclassicality of dynamical processes has been proposed from a quantum-information-theoretic perspective, in terms of witnessing nonclassical correlations with Hamiltonian ensemble simulations. To acquire insights into the quantum-dynamical mechanism of the process nonclassicality, here we propose to investigate the nonclassicality of the electron spin free-induction-decay process associated with an NVcenter. By controlling the nuclear spin precession dynamics via an external magnetic field and nuclear spin polarization, it is possible to manipulate the dynamical behavior of the electron spin, showing a transition between classicality and nonclassicality. We propose an explanation of the classicality-nonclassicality transition in terms of the nuclear spin precession axis orientation and dynamics. We have also performed a series of numerical simulations supporting our findings. Consequently, we can attribute the nonclassical trait of the electron spin dynamics to the behavior of nuclear spin precession dynamics.
对量子世界和经典世界之间模糊边界的持续探索推动了量子科学与技术的重大发展。最近，从量子信息理论的角度，根据与哈密顿量系综模拟见证非经典关联，提出了动力学过程的非经典性。为了深入了解过程非经典性的量子动力学机制，我们在此提议研究与氮空位（NV）中心相关的电子自旋自由感应衰减过程的非经典性。通过外部磁场和核自旋极化来控制核自旋进动动力学，就有可能操纵电子自旋的动力学行为，呈现出经典性与非经典性之间的转变。我们根据核自旋进动轴的取向和动力学对经典性 - 非经典性转变提出了一种解释。我们还进行了一系列数值模拟来支持我们的发现。因此，我们可以将电子自旋动力学的非经典特性归因于核自旋进动动力学的行为。
