华东师范大学学报(自然科学版) ›› 2023, Vol. 2023 ›› Issue (4): 74-85.doi: 10.3969/j.issn.1000-5641.2023.04.008

• 物理学与电子学 • 上一篇    下一篇

光晶格中极性分子链的量子纠缠

岳文静, 魏启*()   

  1. 华东师范大学 精密光谱科学与技术国家重点实验室, 上海 200241
  • 收稿日期:2022-03-07 出版日期:2023-07-25 发布日期:2023-07-25
  • 通讯作者: 魏启 E-mail:qwei@admin.ecnu.edu.cn
  • 基金资助:
    国家自然科学基金(11974113, 11674098)

Quantum entanglement of molecular dipole arrays trapped in an optical lattice

Wenjing YUE, Qi WEI*()   

  1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
  • Received:2022-03-07 Online:2023-07-25 Published:2023-07-25
  • Contact: Qi WEI E-mail:qwei@admin.ecnu.edu.cn

摘要:

极性分子受到外电场作用, 其分子轴将绕电场方向在一定范围内振荡, 形成摆动态. 通过选择能级最低的磁量子数 $ M = 0 $ 的两个摆动态作为量子比特, 研究了囚禁在一维光晶格中的分子链的量子纠缠. 计算了共生纠缠度、全局纠缠度与和电场强度、永久偶极矩、转动常数、偶极–偶极相互作用及温度等有关的3个无量纲变量之间的关系, 从而阐明了极性分子链的量子纠缠的特点.

关键词: 量子纠缠, 极性分子, 摆动态, 光晶格

Abstract:

For a polar molecule subjected to an external electric field, its molecular axis will oscillate around the direction of the electric field, forming pendular states. Taking the two lowest-lying pendular states with magnetic quantum number $M=0 $ as qubit states, we study quantum entanglement of polar molecular arrays trapped in a one-dimensional optical lattice. We evaluate pairwise concurrence and global entanglement as functions of three dimensionless variables related to external field intensity–permanent dipole moment, a rotation constant, dipole-dipole interaction, and temperature —thus revealing the properties of the entangled molecular dipole arrays.

Key words: quantum entanglement, polar molecule, pendular state, optical lattice

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