Experimentally testing Hardy's theorem on nonlocality with entangled mixed states

doi:10.1088/1674-1056/26/4/040302

中国物理B ›› 2017, Vol. 26 ›› Issue (4): 40302-040302.doi: 10.1088/1674-1056/26/4/040302

Experimentally testing Hardy's theorem on nonlocality with entangled mixed states

Dai-He Fan(樊代和), Mao-Chun Dai(戴茂春), Wei-Jie Guo(郭伟杰), Lian-Fu Wei(韦联福)

1 Quantum Optoelectronics Laboratory, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China;
2 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics Science and Engineering, Sun Yet-sen University, Guangzhou 510275, China

收稿日期:2016-12-25 修回日期:2017-01-09 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: Dai-He Fan E-mail:dhfan@swjtu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61308008 and U1330201).

Experimentally testing Hardy's theorem on nonlocality with entangled mixed states

Dai-He Fan(樊代和)¹, Mao-Chun Dai(戴茂春)¹, Wei-Jie Guo(郭伟杰)¹, Lian-Fu Wei(韦联福)^1,2

1 Quantum Optoelectronics Laboratory, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China;
2 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics Science and Engineering, Sun Yet-sen University, Guangzhou 510275, China

Received:2016-12-25 Revised:2017-01-09 Online:2017-04-05 Published:2017-04-05
Contact: Dai-He Fan E-mail:dhfan@swjtu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61308008 and U1330201).

摘要/Abstract

摘要：

Hardy's theorem on nonlocality has been verified by a series of experiments with two-qubit entangled pure states. However, in this paper we demonstrate the experimental test of the theorem by using the two-photon entangled mixed states. We first investigate the generic logic in Hardy's proof of nonlocality, which can be applied for arbitrary two-qubit mixed polarization entangled states and can be reduced naturally to the well-known logic tested successfully by the previous pure state experiments. Then, the optimized violations of locality for various experimental parameters are delivered by the numerical method. Finally, the logic argued above for testing Hardy's theorem on nonlocality is demonstrated experimentally by using the mixed entangled-photon pairs generated via pumping two type-I BBO crystals. Our experimental results shows that Hardy's proof of nonlocality can also be verified with two-qubit polarization entangled mixed states, with a violation of about 3.4 standard deviations.

关键词: Hardy', s theorem, nonlocality, entangled mixed state, spontaneous parametric down conversion (SPDC)

Abstract:

Key words: Hardy', s theorem, nonlocality, entangled mixed state, spontaneous parametric down conversion (SPDC)

中图分类号: (Entanglement and quantum nonlocality)

03.65.Ud

42.50.Xa (Optical tests of quantum theory) 42.65.Lm (Parametric down conversion and production of entangled photons)

樊代和, 戴茂春, 郭伟杰, 韦联福. Experimentally testing Hardy's theorem on nonlocality with entangled mixed states[J]. 中国物理B, 2017, 26(4): 40302-040302.

Dai-He Fan(樊代和), Mao-Chun Dai(戴茂春), Wei-Jie Guo(郭伟杰), Lian-Fu Wei(韦联福). Experimentally testing Hardy's theorem on nonlocality with entangled mixed states[J]. Chin. Phys. B, 2017, 26(4): 40302-040302.

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Experimentally testing Hardy's theorem on nonlocality with entangled mixed states

Experimentally testing Hardy's theorem on nonlocality with entangled mixed states

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