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
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: |
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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: |
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URI: | http://kups.ub.uni-koeln.de/id/eprint/30882 |
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