三光子广义GHZ态中三体纠缠和非定域性研究

J4 ›› 2018, Vol. 35 ›› Issue (5): 583-587.

三光子广义GHZ态中三体纠缠和非定域性研究

赵加强，曹连振，杨阳，逯怀新

潍坊学院物理与光电工程学院, 山东潍坊 261061

收稿日期:2018-02-08 修回日期:2018-04-03 出版日期:2018-09-28 发布日期:2018-09-29
基金资助:
Supported by National Natural Science Foundation of China (国家自然科学基金, 11404246, 11447225), Natural Science Foundation of Shandong Province(山东省自然科学基金, ZR2017MF040, BS2015DX015, ZR2014JL029

Tripartite entanglement and nonlocality in three-photon generalized GHZ states

ZHAO Jiaqiang, CAO Lianzhen, YANG Yang，LU Huaixin

Department of Physics and Optoelectronic Engineering, Weifang University, Weifang 261061, China

Received:2018-02-08 Revised:2018-04-03 Published:2018-09-28 Online:2018-09-29
Contact: zhao jiaqiang

摘要/Abstract

摘要：

一组具有普适性的新型 Bell不等式能够清晰地描述三比特GGHZ态非定域性和三体纠缠的关系。利用高能量的飞秒激光参量转换制备了三光子GGHZ纠缠态，采用量子态层析方法计算得到态的保真度为84%。基于制备的高保真度三光子GGHZ态测量了新型Bell算符和Bell不等式，得到了和理论一致的结果，并实验验证了Das提出的理论结果。实验结果表明，新Bell不等式对定域实在论的违背随GGHZ态纠缠度增加而单调增加，GGHZ态的非定域性与三体纠缠程度直接相关。

关键词: 量子光学；量子纠缠；非定域性；参量下转换；Bell不等式

Abstract:

A set of new Bell inequalities with universality can clearly describe the relationship between the nonlocality and three-body entanglement of three-qbit generalized Greenberger-Horne-Zeilinger(GGHZ) states. Three-photon GGHZ entangled states are prepared by using high-energy femtosecond laser parametric conversion. The state fidelity calculated by quantum state chromatography is 84%. A novel Bell operator and Bell inequality are measured based on the high fidelity three-photon GGHZ state. The results are in agreement with the theory, and the theoretical results proposed by Das are verified by experiments. Experimental results show that the violation to the local realism of the new Bell inequality increases monotonously with the increasing of GGHZ states entanglement degree. The nonlocality of GGHZ states is directly related to the degree of three-body entanglement.

Key words: quantum optics; quantum entanglement; nonlocality; parametric down conversion; Bell inequality

中图分类号:

O431.2

赵加强，曹连振，杨阳，逯怀新. 三光子广义GHZ态中三体纠缠和非定域性研究[J]. J4, 2018, 35(5): 583-587.

ZHAO Jiaqiang, CAO Lianzhen, YANG Yang，LU Huaixin. Tripartite entanglement and nonlocality in three-photon generalized GHZ states[J]. J4, 2018, 35(5): 583-587.

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