Universität zu Köln

Araujo, Mateus, Feix, Adrien, Navascues, Miguel ORCID: 0000-0003-0717-3927 and Brukner, Caslav (2017). A purification postulate for quantum mechanics with indefinite causal order. Quantum, 1. WIEN: VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF. ISSN 2521-327X

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Abstract

To study which are the most general causal structures which are compatible with local quantum mechanics, Oreshkov et al. [1] introduced the notion of a process: a resource shared between some parties that allows for quantum communication between them without a predetermined causal order. These processes can be used to perform several tasks that are impossible in standard quantum mechanics: they allow for the violation of causal inequalities, and provide an advantage for computational and communication complexity. Nonetheless, no process that can be used to violate a causal inequality is known to be physically implementable. There is therefore considerable interest in determining which processes are physical and which are just mathematical artefacts of the framework. Here we make key progress in this direction by proposing a purification postulate: processes are physical only if they are purifiable. We derive necessary conditions for a process to be purifiable, and show that several known processes do not satisfy them.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Araujo, Mateus UNSPECIFIED UNSPECIFIED UNSPECIFIED Feix, Adrien UNSPECIFIED UNSPECIFIED UNSPECIFIED Navascues, Miguel UNSPECIFIED orcid.org/0000-0003-0717-3927 UNSPECIFIED Brukner, Caslav UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-244187
DOI:	10.22331/q-2017-04-26-10
Journal or Publication Title:	Quantum
Volume:	1
Date:	2017
Publisher:	VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF
Place of Publication:	WIEN
ISSN:	2521-327X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SPACE Multiple languages Quantum Science & Technology; Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24418