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	Passive and active nonlocality sharing for a two-qubit system via weak measurements
	Ren, Changliang1,2,3; Feng, Tianfeng4,5; Yao, Dan1; Shi, Haofei1; Chen, Jingling6; Zhou, Xiaoqi4,5
	2019-11-26
摘要	A well-known property of quantum nonlocality is monogamy. However, recent research by Silva et al. shows that multiple observers can share the nonlocality by using weak measurements [Phys. Rev. Lett. 114, 250401 (2015)]. In this paper, we deeply discuss nonlocality sharing for an arbitrary two-qubit state via weak measurements. Two types of nonlocality sharing, passive nonlocality sharing and active nonlocality sharing, which is another type of double violation of Clauser-Horne-Shimony-Holt (CHSH) inequality with many counterintuitive results existing, are fully analyzed. The two types are quite distinct. Active nonlocality sharing can be observed when Bob1 performs strong measurements only except for the ideal strong measurements. Also, a double violation still can be observed in the active nonlocality sharing even using a square pointer type for weak measurements of Bob1, which is impossible in the passive one. As a special example, for a Bell state, a double violation of Clauser-Horne-Shimony-Holt inequality can be always observed in a broad range whether the weak measurement of Bob1 is with an optimal pointer or a square pointer.
DOI	10.1103/PhysRevA.100.052121
发表期刊	PHYSICAL REVIEW A
ISSN	2469-9926
卷号	100期号:5页码:6
通讯作者	Ren, Changliang(renchangliang@cigit.ac.cn) ; Chen, Jingling(chenjl@nankai.edu.cn) ; Zhou, Xiaoqi(zhouxq8@mail.sysu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000498843900002
语种	英语