Chae Eunmi
Department of Physics, Korea University, Seoul, Republic of Korea.
Phys Chem Chem Phys. 2021 Jan 21;23(2):1215-1220. doi: 10.1039/d0cp04042h.
Diatomic polar molecules are one of the most promising platforms of quantum computing due to their rich internal states and large electric dipole moments. Here, we propose entangling rotational states of MgF molecules in an optical tweezer array via strong electric dipole-dipole interactions. We employ two rotational states with the projection quantum number of the total angular momentum MF = 0 to maximize the dipole-dipole interaction with a given separation distance. The splitting of 1.27 kHz between two entangled states is predicted for MgF molecules separated by 1 μm. The resolution of the entangled states can be achieved in a magic optical potential where the rotational states have the same trap frequencies. The magic potential can be formed by tuning the angle between the molecules' quantization axis and the linear polarization of trapping light to a "magic angle". We calculate the magic angle for MgF molecules under reasonable experimental conditions and obtain that the trap frequencies of the two involved states can be matched within a few 10s of Hz. By establishing an entanglement scheme for the molecules, our results provide a first step towards quantum computing using MgF molecules.
双原子极性分子因其丰富的内部状态和大电偶极矩，成为量子计算中最具潜力的平台之一。在此，我们提出通过强电偶极 - 偶极相互作用，在光镊阵列中使MgF分子的转动状态纠缠。我们采用总角动量投影量子数MF = 0的两个转动状态，以在给定的分离距离下最大化偶极 - 偶极相互作用。对于相距1μm的MgF分子，预测两个纠缠态之间的分裂为1.27kHz。在一个神奇光势中可以实现纠缠态的分辨，其中转动状态具有相同的囚禁频率。通过将分子的量子化轴与俘获光的线偏振之间的角度调谐到“神奇角度”，可以形成神奇光势。我们在合理的实验条件下计算了MgF分子的神奇角度，并得出所涉及的两个状态的囚禁频率可以在几十赫兹内匹配。通过为分子建立纠缠方案，我们的结果为使用MgF分子进行量子计算迈出了第一步。
