Gachechiladze, Mariami, Miklin, Nikolai ORCID: 0000-0001-8046-382X and Chaves, Rafael ORCID: 0000-0001-8493-4019 (2020). Quantifying Causal Influences in the Presence of a Quantum Common Cause. Phys. Rev. Lett., 125 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Quantum mechanics challenges our intuition on the cause-effect relations in nature. Some fundamental concepts, including Reichenbach's common cause principle or the notion of local realism, have to be reconsidered. Traditionally, this is witnessed by the violation of a Bell inequality. But are Bell inequalities the only signature of the incompatibility between quantum correlations and causality theory? Motivated by this question, we introduce a general framework able to estimate causal influences between two variables, without the need of interventions and irrespectively of the classical, quantum, or even postquantum nature of a common cause. In particular, by considering the simplest instrumental scenario-for which violation of Bell inequalities is not possible-we show that every pure bipartite entangled state violates the classical bounds on causal influence, thus, answering in negative to the posed question and opening a new venue to explore the role of causality within quantum theory.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Gachechiladze, MariamiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Miklin, NikolaiUNSPECIFIEDorcid.org/0000-0001-8046-382XUNSPECIFIED
Chaves, RafaelUNSPECIFIEDorcid.org/0000-0001-8493-4019UNSPECIFIED
URN: urn:nbn:de:hbz:38-308825
DOI: 10.1103/PhysRevLett.125.230401
Journal or Publication Title: Phys. Rev. Lett.
Volume: 125
Number: 23
Date: 2020
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1079-7114
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
Physics, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/30882

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