基于CHSH不等式几何解释的“X”态量子非局域关联检验

曾柏云; 辜鹏宇; 胡强; 贾欣燕; 樊代和

doi:10.7498/aps.71.20220445

摘要

量子非局域关联现象是量子理论区别于经典理论的重要特征之一. “X”态作为一种典型的量子混合态, 基于其进行的量子非局域关联的检验研究, 不论对验证量子理论的正确性, 还是在量子信息论的应用领域研究, 都具有重要的意义. 本文在基于传统Clauser-Horne-Shimony-Holt (CHSH)不等式进行量子非局域关联检验的基础上, 提出了一种基于“X”态几何解释的量子非局域关联检验策略. 利用“X”态的几何解释策略, 可使物理图像更为直观地研究检验时最优化测量基选取, 以及可获得的最大CHSH不等式检验值等. 最后给出了基于CHSH不等式几何解释策略, “X”态成功进行量子非局域关联检验的参数范围.

关键词:

Abstract

Quantum nonlocal correlation is one of the important features that distinguish the quantum theory from classical theory. As a typical quantum mixed state, the study of quantum nonlocal correlation based on the “X” state is of great importance for the verification of the correctness of quantum theory and the application of quantum information theory. In this work, with the traditional Clauser-Horne-Shimony-Holt (CHSH) inequality testing for quantum nonlocal correlations, we propose a strategy for testing the quantum nonlocal correlations based on the geometric interpretation of the “X” state. By using the geometric interpretation of the “X” state, which is described by the transform of Bloch sphere, it is possible to investigate the optimal selection of measurement settings. The maximum value of CHSH inequalities can also obtained from the physical images. Finally, the range of parameters for a successful quantum nonlocal correlation testing based on the CHSH inequality for the “X” state is studied. The results show that when $f = 1$, the “X” state will be reduced to a normal pure entangled state, and the quantum nonlocal correlation testing results are in full agreement with the traditional ones. This result proves the correctness of the geometric interpretation strategy proposed in this work. When$f \lt 1$, only some of the “X” states can be used for e successfully testing the quantum nonlocal correlations. It is also found that the range of fidelity values that can successfully test the quantum nonlocal correlations will be further increased by increasing the values of r. In particular, when r = 1, the range of fidelity value will reach a largest one (e.g. $f \gt 0.781$). The results in this work can provide the reference for experimentally testing the quantum nonlocal correlation by using the “X” state.

Keywords:

作者及机构信息

西南交通大学物理科学与技术学院, 成都　610031

通信作者: 樊代和, dhfan@swjtu.edu.cn

基金项目: 计算物理国防科技重点实验室项目(批准号: 6142A05180401)和国家自然科学基金 (批准号: 12147208)资助的课题.

Authors and contacts

School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China

Corresponding author: Fan Dai-He, dhfan@swjtu.edu.cn

Funds: Project supported by the Key Laboratory Project of Computational Physics of National Defense Science and Technology, China (Grant No. 6142A05180401) and the National Natural Science Foundation of China (Grant No. 12147208).

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参考文献

[1]	Einstein A, Podolsky B, Rosen N 1935 Phys. Rev. 47 777 Google Scholar
[2]	Chen Y A, Zhang Q, Chen T Y, et al. 2021 Nature 589 214 Google Scholar
[3]	Zhang X, Li H O, Cao G, Xiao M, Guo G C, Guo G P 2019 Nat. Sci. Rev. 6 32 Google Scholar
[4]	Horodecki R 2021 arXiv: 2103.07712 v2 [quant-ph]
[5]	Bell J S 1964 Physics 1 195 Google Scholar
[6]	Clauser J F, Horne M A, Shimony A, Holt R A 1969 Phys. Rev. Lett. 23 880 Google Scholar
[7]	Freedman S J, Clauser J F 1972 Phys. Rev. Lett. 28 938 Google Scholar
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[11]	Mermin N D 1990 Phys. Rev. Lett. 65 1838 Google Scholar
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施引文献

图 1 基于CHSH不等式的Bloch球表示图. 左右两个Bloch球分别代表A和B两个系统, 它们之间的关系由一个关联矩阵K进行描述. ${\boldsymbol{j}}$和${\boldsymbol{q}}$表示A系统中的两个测量方向, ${\boldsymbol{p}}$和${\boldsymbol{t}}$表示B系统中的两个测量方向

Fig. 1. Diagram of Bloch ball representation based on CHSH inequality. The left and right Bloch sphere represents the two sub-system A and B, respectively. The relationship between them is described by a correlation matrix K. ${\boldsymbol{j}}$ and ${\boldsymbol{q}}$ represents the two measurement directions in system A, ${\boldsymbol{p}}$ and ${\boldsymbol{t}}$ represents the two measurement directions in system B.

下载: 全尺寸图片幻灯片

图 2 将关联矩阵K作用于B系统后的Bloch球表示图. 其中A系统的Bloch球保持不变, B系统的Bloch球受关联矩阵K的影响而发生改变. 两系统间的关联由单位矩阵I来描述

Fig. 2. The Bloch sphere representation diagram by applying the correlation matrix K to system B. The Bloch sphere of system A keep constant. The Bloch sphere of system B is changed. The correlation between two systems is described by the unit matrix I.

下载: 全尺寸图片幻灯片

图 3 B系统Bloch球退变为一椭圆平面时的表示图　(a)向量 ${{\boldsymbol{p}}_K}$在椭圆上的交点为${B_1}$, 向量${{\boldsymbol{t}}_K}$在椭圆上的交点是${B_2}$, 红色虚线表示向量${{\boldsymbol{p}}_K} + {{\boldsymbol{t}}_K}$, 橙色点划线表示向量${{\boldsymbol{p}}_K} - {{\boldsymbol{t}}_K}$; (b) 向量${{\boldsymbol{p}}_K}$在椭圆上的交点是${C_2}$, 向量${{\boldsymbol{t}}_K}$在椭圆上的交点是${C_3}$, 橙色点划线表示最大期望值${S_{\max }}$

Fig. 3. Diagram of elliptic plane when the Bloch sphere of system B is changed: (a) The intersection of vector ${{\boldsymbol{p}}_K}$ on the ellipse is ${B_1}$, the intersection of vector ${{\boldsymbol{t}}_K}$ on the ellipse is ${B_2}$. The red dashed line indicates vector ${{\boldsymbol{p}}_K} + {{\boldsymbol{t}}_K}$, and the orange dotted line indicates vector ${{\boldsymbol{p}}_K} - {{\boldsymbol{t}}_K}$. (b) The intersection of vector ${{\boldsymbol{p}}_K}$ on the ellipse is ${C_2}$ , and the intersection of vector ${{\boldsymbol{t}}_K}$ on the ellipse is ${C_3}$. The orange dotted line indicates the maximum expectation value of ${S_{\max }}$.

下载: 全尺寸图片幻灯片

图 4 在不同保真度f下, ${S_{\max }}$随r的变化关系图

Fig. 4. Plot of ${S_{\max }}$ vs. r under different values of fidelity f.

下载: 全尺寸图片幻灯片

图 5 在不同r下, ${S_{\max }}$随保真度f的变化关系图

Fig. 5. Plot of ${S_{\max }}$ vs. fidelity f under different values of r.

下载: 全尺寸图片幻灯片

图 6 ${f_{\min }}$随r的变化关系图

Fig. 6. Plot of ${f_{\min }}$vs. r.

下载: 全尺寸图片幻灯片

图 7 ${S_{\max }}$随保真度f和r的变化关系图

Fig. 7. Plot of ${S_{\max }}$ vs. fidelity f and r.

下载: 全尺寸图片幻灯片

[1]	Einstein A, Podolsky B, Rosen N 1935 Phys. Rev. 47 777 Google Scholar
[2]	Chen Y A, Zhang Q, Chen T Y, et al. 2021 Nature 589 214 Google Scholar
[3]	Zhang X, Li H O, Cao G, Xiao M, Guo G C, Guo G P 2019 Nat. Sci. Rev. 6 32 Google Scholar
[4]	Horodecki R 2021 arXiv: 2103.07712 v2 [quant-ph]
[5]	Bell J S 1964 Physics 1 195 Google Scholar
[6]	Clauser J F, Horne M A, Shimony A, Holt R A 1969 Phys. Rev. Lett. 23 880 Google Scholar
[7]	Freedman S J, Clauser J F 1972 Phys. Rev. Lett. 28 938 Google Scholar
[8]	Aspect A, Dalibard J, Roger G 1982 Phys. Rev. Lett. 49 1804 Google Scholar
[9]	Collins D, Gisin N, Linden N, Massar S, Popescu S 2002 Phys. Rev. Lett. 88 040404 Google Scholar
[10]	Collins D, Gisin N 2004 J. Math. Phys. 37 1775 Google Scholar
[11]	Mermin N D 1990 Phys. Rev. Lett. 65 1838 Google Scholar
[12]	Ardehali M 1992 Phys. Rev. A 46 5375 Google Scholar
[13]	Belinskiĭ A, Klyshko D N 1993 Phys. Usp. 36 653 Google Scholar
[14]	Greenberger D M, Horne M A, Shimony A, Zeilinger A 1990 Am. J. Phys. 58 1131 Google Scholar
[15]	Hardy L 1993 Phys. Rev. Lett. 71 1665 Google Scholar
[16]	Kim J H, Chae J W, Jeong Y C, Kim Y H 2022 J. Korean Phys. Soc. 80 203 Google Scholar
[17]	Singh J, Ghosh S, Arvind, Goyal S K 2021 Phys. Lett. A 392 127158 Google Scholar
[18]	Koga J I, Kimura G, Maeda K 2018 Phys. Rev. A 97 062338 Google Scholar
[19]	Seiler J, Strohm T, Schleich W P 2021 Phys. Rev. A 104 032218 Google Scholar
[20]	Werner R F 1989 Phys. Rev. A 40 4277 Google Scholar
[21]	Zhang Y S, Huang Y F, Li C F, Guo G C 2002 Phys. Rev. A 66 062315 Google Scholar
[22]	Yu T, Eberly J 2007 Quantum Inf. Comput. 7 459
[23]	Shi J D, Wu T, Song X K, Ye L 2014 Quantum Inf. Process. 13 1045 Google Scholar
[24]	Namitha C, Satyanarayana S 2018 J. Phys. B:At. Mol. Opt. 51 045506 Google Scholar
[25]	Mishra S, Thapliyal K, Pathak A, Venugopalan A 2022 Quantum Inf. Process. 21 1 Google Scholar
[26]	Guo Y N, Peng H P, Zeng K, Wang G Y 2020 Quantum Inf. Process. 19 1 Google Scholar
[27]	刘晋, 缪波, 胡强, 樊代和 2020 量子光学学报 26 6 Google Scholar Liu J, Miu B, Hu Q, Fan D H 2020 J. Quantum Opt. 26 6 Google Scholar
[28]	石名俊, 杜江峰, 朱栋培, 阮图南 2000 物理学报 49 1912 Google Scholar Shi M J, Du J F, Zhu D P, Ruan T N 2000 Acta Phys. Sin. 49 1912 Google Scholar
[29]	Connes A, Zagier D 2007 Am. Math. Mon. 114 909 Google Scholar

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基于CHSH不等式几何解释的“X”态量子非局域关联检验