华东师范大学学报（自然科学版） >

2023 , Vol. 2023 >Issue 4: 74 - 85

DOI: https://doi.org/10.3969/j.issn.1000-5641.2023.04.008

物理学与电子学

光晶格中极性分子链的量子纠缠

  • 岳文静 ,
  • 魏启
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  • 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

  网络出版日期: 2023-07-25

基金资助

国家自然科学基金(11974113, 11674098)

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Quantum entanglement of molecular dipole arrays trapped in an optical lattice

  • Wenjing YUE ,
  • Qi WEI
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  • State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai　200241, China

Received date: 2022-03-07

  Online published: 2023-07-25

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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

本文引用格式

岳文静 , 魏启 . 光晶格中极性分子链的量子纠缠[J]. 华东师范大学学报（自然科学版）, 2023 , 2023(4) : 74 -85 . DOI: 10.3969/j.issn.1000-5641.2023.04.008

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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