| 双量子比特系统耦合度J大小的测量(英文) |
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| 引用本文： | 曹惠娟,胡连.双量子比特系统耦合度J大小的测量(英文)[J].量子电子学报,2008,25(5):577-581. |
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| 作者姓名： | 曹惠娟 胡连 |
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| 作者单位： | 华南师范大学物理与电信工程学院凝聚态物理研究所,广东,广州,510006 |
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| 基金项目： | 国家自然科学基金，广东省自然科学基金 |
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| 摘 要： | 提出了一种可以精确测量有耦合的双量子比特系统的耦合项J的大小的方法.通过绝热近似计算得到了系统的哈密顿量的四个能级及其相对应的绝热本征态.利用求解得到的本征态计算分析了两低能级本征态的极化矢量,得到在对称系统中,耦合项J的大小等于使两低能级态的极化矢量长度发生突变时的外加磁场的z分量的值.此外,还利用两个不同的纠缠定义计算分析了系统的纠缠程度.在对称系统中,各个本征态的纠缠度和冯·诺伊曼熵基本相一致.
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| 关 键 词： | 量子计算 耦合常数 简并 突变 量子比特 |
Detecting the exchange constant of the coupled two-qubit system |
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| CAO Hui-juan,HU Lian.Detecting the exchange constant of the coupled two-qubit system[J].Chinese Journal of Quantum Electronics,2008,25(5):577-581. |
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| Authors: | CAO Hui-juan HU Lian |
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| Affiliation: | CAO Hui-juan HU Lian (Institute for Condensed Matter Physics,School of Physics , Telecommunication Engineering,South China Normal University,Guangzhou 510006,China) |
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| Abstract: | A method of measuring the exchange constant J of two-qubit system is proposed.The energy levels and eigenvectors are calculated by adiabatic approximation.The length of polarization of this system is obtained,and the value of exchange constant of symmetric system is found to equal to the value of z component of external magnetic field at the level crossing.In addition, the concurrence of each eigenvector accords with the measurement of Von Neumann entropy for symmetry system. |
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| Keywords: | quantum computation exchange constant degeneracy sudden change quantum bits |
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