Interplay of quantum resources in nonlocality tests

Dong, HH; Zhu, Y; Cheng, SY; Zhang, X; Li, CL; Li, YZ; Li, H; You, L; Ma, X; Zhang, Q; Pan, JW

Interplay of quantum resources in nonlocality tests

Dong, HH Zhu, Y Cheng, SY Zhang, X

Li, CL Li, YZ Li, H You, L Ma, X Zhang, Q Pan, JW

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Publisher:: AMER PHYSICAL SOC
Publication Type:: Journal Article
Citation:: Physical Review Research, 2025, 7, (2)
Issue Date:: 2025-04-01

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Field	Value	Language
dc.contributor.author	Dong, HH
dc.contributor.author	Zhu, Y
dc.contributor.author	Cheng, SY
dc.contributor.author	Zhang, X https://orcid.org/0000-0003-0677-6996
dc.contributor.author	Li, CL
dc.contributor.author	Li, YZ
dc.contributor.author	Li, H
dc.contributor.author	You, L
dc.contributor.author	Ma, X
dc.contributor.author	Zhang, Q
dc.contributor.author	Pan, JW
dc.date.accessioned	2026-07-30T03:44:54Z
dc.date.available	2025-04-28
dc.date.available	2026-07-30T03:44:54Z
dc.date.issued	2025-04-01
dc.identifier.citation	Physical Review Research, 2025, 7, (2)
dc.identifier.issn	2643-1564
dc.identifier.issn	2643-1564
dc.identifier.uri	http://hdl.handle.net/10453/195842
dc.description.abstract	Nonlocality, evidenced by the violation of Bell inequalities, not only signifies entanglement but also highlights measurement incompatibility in quantum systems. Utilizing the tilted Clauser-Horne-Shimony-Holt (CHSH) Bell inequality, our high-efficiency optical setup achieves a loophole-free violation of 2.0132. This result provides a device-independent lower bound on entanglement, quantified as the entanglement of formation at 0.0159. Moreover, by tuning the parameters of the tilted CHSH inequality, we enhance the estimation of measurement incompatibility, which is quantified by an effective overlap of 4.3883×10-5. To explore the intricate interplay among nonlocality, entanglement, and measurement incompatibility, we generate mixed states, allowing for flexible modulation of entanglement via fast switching among the four Bell states using Pockels cells, achieving a fidelity above 99.10%. Intriguingly, our results reveal a counterintuitive relationship where increasing incompatibility initially boosts nonlocality but eventually leads to its reduction. Typically, maximal nonlocality does not coincide with maximal incompatibility. This experimental study sheds light on the optimal management of quantum resources for Bell-inequality-based quantum information processing.
dc.language	English
dc.publisher	AMER PHYSICAL SOC
dc.relation.ispartof	Physical Review Research
dc.relation.isbasedon	10.1103/PhysRevResearch.7.L022055
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	51 Physical sciences
dc.title	Interplay of quantum resources in nonlocality tests
dc.type	Journal Article
utslib.citation.volume	7
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Computer Science
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2026-07-30T03:44:53Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	7
utslib.citation.issue	2

Abstract:

Nonlocality, evidenced by the violation of Bell inequalities, not only signifies entanglement but also highlights measurement incompatibility in quantum systems. Utilizing the tilted Clauser-Horne-Shimony-Holt (CHSH) Bell inequality, our high-efficiency optical setup achieves a loophole-free violation of 2.0132. This result provides a device-independent lower bound on entanglement, quantified as the entanglement of formation at 0.0159. Moreover, by tuning the parameters of the tilted CHSH inequality, we enhance the estimation of measurement incompatibility, which is quantified by an effective overlap of 4.3883×10-5. To explore the intricate interplay among nonlocality, entanglement, and measurement incompatibility, we generate mixed states, allowing for flexible modulation of entanglement via fast switching among the four Bell states using Pockels cells, achieving a fidelity above 99.10%. Intriguingly, our results reveal a counterintuitive relationship where increasing incompatibility initially boosts nonlocality but eventually leads to its reduction. Typically, maximal nonlocality does not coincide with maximal incompatibility. This experimental study sheds light on the optimal management of quantum resources for Bell-inequality-based quantum information processing.

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http://hdl.handle.net/10453/195842