Universität zu Köln

Agresti, Iris, Poderini, Davide ORCID: 0000-0003-0577-1608, Polacchi, Beatrice ORCID: 0000-0003-3133-3564, Miklin, Nikolai ORCID: 0000-0001-8046-382X, Gachechiladze, Mariami ORCID: 0000-0001-9338-7483, Suprano, Alessia ORCID: 0000-0003-2989-8881, Polino, Emanuele ORCID: 0000-0003-1438-8942, Milani, Giorgio, Carvacho, Gonzalo, Chaves, Rafael ORCID: 0000-0001-8493-4019 and Sciarrino, Fabio (2022). Experimental test of quantum causal influences. Sci. Adv., 8 (8). WASHINGTON: AMER ASSOC ADVANCEMENT SCIENCE. ISSN 2375-2548

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Abstract

Since Bell's theorem, it is known that local realism fails to explain quantum phenomena. Bell inequality violations manifestly show the incompatibility of quantum theory with classical notions of cause and effect. As recently found, however, the instrumental scenario-a pivotal tool in causal inference-allows for nonclassicality signatures going beyond this paradigm. If we are not limited to observational data and can intervene in our setup, then we can witness quantum violations of classical bounds on the causal influence among the involved variables even when no Bell-like violation is possible. That is, through interventions, the quantum behavior of a system that would seem classical can be demonstrated. Using a photonic setup-faithfully implementing the instrumental causal structure and switching between observation and intervention run by run-we experimentally witness such a nonclassicality. We also test quantum bounds for the causal influence, showing that they provide a reliable tool for quantum causal modeling.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Agresti, Iris UNSPECIFIED UNSPECIFIED UNSPECIFIED Poderini, Davide UNSPECIFIED orcid.org/0000-0003-0577-1608 UNSPECIFIED Polacchi, Beatrice UNSPECIFIED orcid.org/0000-0003-3133-3564 UNSPECIFIED Miklin, Nikolai UNSPECIFIED orcid.org/0000-0001-8046-382X UNSPECIFIED Gachechiladze, Mariami UNSPECIFIED orcid.org/0000-0001-9338-7483 UNSPECIFIED Suprano, Alessia UNSPECIFIED orcid.org/0000-0003-2989-8881 UNSPECIFIED Polino, Emanuele UNSPECIFIED orcid.org/0000-0003-1438-8942 UNSPECIFIED Milani, Giorgio UNSPECIFIED UNSPECIFIED UNSPECIFIED Carvacho, Gonzalo UNSPECIFIED UNSPECIFIED UNSPECIFIED Chaves, Rafael UNSPECIFIED orcid.org/0000-0001-8493-4019 UNSPECIFIED Sciarrino, Fabio UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-684449
DOI:	10.1126/sciadv.abm1515
Journal or Publication Title:	Sci. Adv.
Volume:	8
Number:	8
Date:	2022
Publisher:	AMER ASSOC ADVANCEMENT SCIENCE
Place of Publication:	WASHINGTON
ISSN:	2375-2548
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68444