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含能流的各向同性XY链中的基态纠缠
  • ISSN号：1671-4512
  • 期刊名称：《华中科技大学学报：自然科学版》
  • 时间：0
  • 分类：O413.1[理学—理论物理;理学—物理]
  • 作者机构：[1]清华大学量子信息与测量教育部重点实验室, [2]北京邮电大学理学院, [3]北京
  • 相关基金：国家自然科学基金资助项目(10447116,10325521,60433050)
作者： 刘丹[1], 张勇[2], 刘洋[1], 龙桂鲁[3]
关键词： 能流, 纠缠, 量子相变, energy current, entanglement, quantum phase transition
中文摘要：

分析了含能流的横磁场三比特各向同性XY自旋链的基态纠缠.发现随着外磁场的变化,系统会发生量子相变.以三比特系统为例给出有效哈密顿量的能谱,讨论了体系基态纠缠随λ的变化.当λ<3/3时,在相变点处基态由W态跳跃到非纠缠态,此时自旋链中没有能量流动.当3/3≤λ≤3时,在能级交错点处发生量子相变,体系由非能流相进入能流相,同时基态由W态1跳跃到另一W态5;此时,由于能流的影响,使得基态保持在W态,而不再处于非纠缠态;并且随着λ的增大,系统将在更大范围内处于能流相.当λ>3时,基态波函数表示为5,系统完全处于能流相.

英文摘要：

The ground state entanglement in an isotropic three-qubit transverse XY model with energy current is analyzed.A quantum phase transition from a no-energy-current phase to energy-current phase is found when the magnetic field changes.The spectrum of the effective Hamiltonian of the three-qubit system is shown.The ground state entanglement is investigated against λ.When λ<3/3,the ground state changes from a W state to a disentangled state when the magnetic field exceeds the critical point.There is not ener...

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期刊信息
  • 《华中科技大学学报：自然科学版》
  • 中国科技核心期刊
  • 主管单位:中华人民共和国教育部
  • 主办单位:华中科技大学
  • 主编：丁烈云
  • 地址：武汉珞喻路1037号
  • 邮编：430074
  • 邮箱：hgxbs@mail.hust.edu.cn
  • 电话：027-87543916 87544294
  • 国际标准刊号：ISSN：1671-4512
  • 国内统一刊号：ISSN：42-1658/N
  • 邮发代号:38-9
  • 获奖情况:
  • 全国优秀科技期刊,首届国家期刊奖,第二届全国优秀科技期刊评比一等奖,中国期刊方阵“双效”期刊
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  • 被引量:21013