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Relative distance of entangled systems in emergent spacetime scenarios
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC). Basic Research Community for Physics e.V., Germany.ORCID-id: 0000-0001-9344-8549
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). KTH Royal Institute of Technology, Sweden.
Rekke forfattare: 32023 (engelsk)Inngår i: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 107, nr 6, artikkel-id 066008Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Spacetime emergence from entanglement proposes an alternative to quantizing gravity and typically derives a notion of distance based on the amount of mutual information shared across subsystems. Albeit promising, this program still faces challenges to describe simple physical systems, such as a maximally entangled Bell pair that is taken apart while preserving its entanglement. We propose a solution to this problem: a reminder that quantum systems can have multiple sectors of independent degrees of freedom, and that each sector can be entangled. Thus, while one sector can decohere, and decrease the amount of total mutual information within the system, another sector, e.g. spin, can remain entangled. We illustrate this with a toy model, showing that only within the particles' momentum uncertainty there can be considerably more entanglement than in the spin sector for a single Bell pair. We finish by introducing some considerations about how spacetime could be tested in the lab in the future.

sted, utgiver, år, opplag, sider
2023. Vol. 107, nr 6, artikkel-id 066008
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URN: urn:nbn:se:su:diva-229581DOI: 10.1103/PhysRevD.107.066008ISI: 000989369500009Scopus ID: 2-s2.0-85151289976OAI: oai:DiVA.org:su-229581DiVA, id: diva2:1860581
Tilgjengelig fra: 2024-05-24 Laget: 2024-05-24 Sist oppdatert: 2024-10-15bibliografisk kontrollert

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