量子电子学报 ›› 2023, Vol. 40 ›› Issue (4): 519-527.doi: 10.3969/j.issn.1007-5461.2023.04.011

• 量子光学 • 上一篇    下一篇

玻色-爱因斯坦凝聚体中三体和四体相互作用对自旋压缩和量子纠缠的影响研究

李嵩松   

  1. ( 南昌师范学院物理系, 江西 南昌 330032 )
  • 收稿日期:2022-03-12 修回日期:2022-05-31 出版日期:2023-07-28 发布日期:2023-07-28
  • 作者简介:李嵩松 ( 1971 − ), 江西丰城人, 博士, 教授, 主要从事量子信息方面的研究。 E-mail: mphysics@163.com
  • 基金资助:
    江西省科技厅03 专项 ( 20212ABC03A23 ), 江西省教育厅科技项目 ( GJJ202613/GJJ212611 ), 南昌市重点实验室项目 ( 2021-NCZDSY-015 )

Effects of three-body and four-body interactions on spin squeezing and quantum entanglement in Bose-Einstein condensates

LI Songsong   

  1. ( Department of Physics, Nanchang Normal University, Nanchang 330032, China )
  • Received:2022-03-12 Revised:2022-05-31 Published:2023-07-28 Online:2023-07-28

摘要: 自旋压缩和量子纠缠在量子信息处理中有着极为重要而广泛的应用, 因此利用玻色-爱因斯坦凝聚中的多体
相互作用产生自旋压缩和量子纠缠具有重要意义。研究了玻色-爱因斯坦凝聚的密度较大时, 三体相互作用和四体
相互作用对自旋压缩和量子纠缠的影响, 利用短时近似解析计算了自旋压缩参数和两种不同的纠缠参数。结果表
明: 在动力学过程中, 三体相互作用和四体相互作用能诱导产生自旋压缩和量子纠缠;且四体相互作用比三体相互作
用能产生更强的自旋压缩和更好的量子纠缠。

关键词: 量子光学, 量子纠缠, 自旋压缩, 短时近似, 玻色-爱因斯坦凝聚

Abstract: Spin squeezing and quantum entanglement are very important and widely used in quantum information processing. Therefore, it is meaningful to produce spin squeezing and quantum entanglement using the multi-body interaction in Bose-Einstein condensation. The effects of three-body and four-body interactions on spin squeezing and quantum entanglement at high density Bose-Einstein condensation are investigated, and the spin squeezing parameters and two entanglement parameters are analytically calculated using short time approximation. The results show that in the dynamic process, three- and fourbody interactions can produce spin squeezing and quantum entanglement. Moreover, four-body interaction can produce stronger spin squeezing and better entanglement than the three-body interaction.

Key words: quantum optics, quantum entanglement, spin squeezing, short time approximation; Bose-Einstein condensates

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