Matsuzaki Yuichiro, Imoto Takashi, Susa Yuki
Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan.
NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan.
Sci Rep. 2022 Sep 2;12(1):14964. doi: 10.1038/s41598-022-17621-1.
Quantum annealing is a way to solve a combinational optimization problem where quantum fluctuation is induced by transverse fields. Recently, a bifurcation-based quantum annealing with spin-1 particles was suggested as another mechanism to implement the quantum annealing. In the bifurcation-based quantum annealing, each spin is initially prepared in [Formula: see text], let this state evolve by a time-dependent Hamiltonian in an adiabatic way, and we find a state spanned by [Formula: see text] at the end of the evolution. Here, we propose a scheme to generate multipartite entanglement, namely GHZ states, between spin-1 particles by using the bifurcation-based quantum annealing. We gradually decrease the detuning of the spin-1 particles while we adiabatically change the amplitude of the external driving fields. Due to the dipole-dipole interactions between the spin-1 particles, we can prepare the GHZ state after performing this protocol. We discuss possible implementations of our scheme by using nitrogen vacancy centers in diamond.
量子退火是一种解决组合优化问题的方法，其中量子涨落由横向场诱导产生。最近，一种基于自旋-1粒子的分岔量子退火被提出作为实现量子退火的另一种机制。在基于分岔的量子退火中，每个自旋最初制备在[公式：见原文]，让这个态通过一个含时哈密顿量以绝热方式演化，并且我们在演化结束时找到一个由[公式：见原文]张成的态。在此，我们提出一种通过使用基于分岔的量子退火在自旋-1粒子之间生成多体纠缠即GHZ态的方案。当我们绝热地改变外部驱动场的幅度时，我们逐渐减小自旋-1粒子的失谐。由于自旋-1粒子之间的偶极-偶极相互作用，在执行此协议后我们可以制备GHZ态。我们讨论了通过使用金刚石中的氮空位中心来实现我们方案的可能性。
