Why we need to quantise everything, including gravity

Why we need to quantise everything, including gravity Quantum gravity—the theory that will merge quantum theory and general relativity—is yet to be found. Some physicist even claim that it is not needed after all: quantum theory and general relativity can coexist in their respective domains. In cont...

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Autores principales:	C. Marletto, V. Vedral
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/3452d115d7434055b650465c1dbb8fe3
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spelling	oai:doaj.org-article:3452d115d7434055b650465c1dbb8fe32021-12-02T15:10:12ZWhy we need to quantise everything, including gravity10.1038/s41534-017-0028-02056-6387https://doaj.org/article/3452d115d7434055b650465c1dbb8fe32017-07-01T00:00:00Zhttps://doi.org/10.1038/s41534-017-0028-0https://doaj.org/toc/2056-6387Why we need to quantise everything, including gravity Quantum gravity—the theory that will merge quantum theory and general relativity—is yet to be found. Some physicist even claim that it is not needed after all: quantum theory and general relativity can coexist in their respective domains. In contrast, a powerful line of argument in favour of quantum gravity states that a gravitational classical system coupled to a quantum system must itself be quantum. These arguments have a long history, starting in the early days of quantum theory. Yet, they have limited applicability because they rely on restrictive assumptions. This paper proposes a radically different approach. The key feature is an information-theoretic characterisation of both the quantum and the classical systems, which makes the argument in the most general form ever proposed. Any system displaying quantum effects is capable of transmitting its quantum properties to the classical systems interacting with it via copy-like operations.C. MarlettoV. VedralNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 3, Iss 1, Pp 1-5 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 C. Marletto V. Vedral Why we need to quantise everything, including gravity
description	Why we need to quantise everything, including gravity Quantum gravity—the theory that will merge quantum theory and general relativity—is yet to be found. Some physicist even claim that it is not needed after all: quantum theory and general relativity can coexist in their respective domains. In contrast, a powerful line of argument in favour of quantum gravity states that a gravitational classical system coupled to a quantum system must itself be quantum. These arguments have a long history, starting in the early days of quantum theory. Yet, they have limited applicability because they rely on restrictive assumptions. This paper proposes a radically different approach. The key feature is an information-theoretic characterisation of both the quantum and the classical systems, which makes the argument in the most general form ever proposed. Any system displaying quantum effects is capable of transmitting its quantum properties to the classical systems interacting with it via copy-like operations.
format	article
author	C. Marletto V. Vedral
author_facet	C. Marletto V. Vedral
author_sort	C. Marletto
title	Why we need to quantise everything, including gravity
title_short	Why we need to quantise everything, including gravity
title_full	Why we need to quantise everything, including gravity
title_fullStr	Why we need to quantise everything, including gravity
title_full_unstemmed	Why we need to quantise everything, including gravity
title_sort	why we need to quantise everything, including gravity
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3452d115d7434055b650465c1dbb8fe3
work_keys_str_mv	AT cmarletto whyweneedtoquantiseeverythingincludinggravity AT vvedral whyweneedtoquantiseeverythingincludinggravity
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Why we need to quantise everything, including gravity

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