Cited by 223Quantum Mechanics and ApplicationsQuantum Information and CryptographyNoncommutative and Quantum Gravity Theories

No extension of quantum theory can have improved predictive power

Open access
Colbeck, Roger, Renner, Renato·2011·Nature Communications

Abstract

According to quantum theory, measurements generate random outcomes, in stark contrast with classical mechanics. This raises the question of whether there could exist an extension of the theory that removes this indeterminism, as suspected by Einstein, Podolsky and Rosen. Although this has been shown to be impossible, existing results do not imply that the current theory is maximally informative. Here we ask the more general question of whether any improved predictions can be achieved by any extension of quantum theory. Under the assumption that measurements can be chosen freely, we answer this question in the negative: no extension of quantum theory can give more information about the outcomes of future measurements than quantum theory itself. Our result has significance for the foundations of quantum mechanics, as well as applications to tasks that exploit the inherent randomness in quantum theory, such as quantum cryptography. Quantum-mechanical predictions are generally probabilistic. Here, assuming freely chosen measurements, it is shown that enhanced predictions are not possible and, thus, randomness is inherent in quantum theory: a result that has applications in fields such as quantum cryptography.

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  • Earlier no-go results use assumptions similar to (Q) and (S).

    “Theorem 1 may be compared to earlier no-go results, such as7–10,41–43, which also use assumptions similar to (Q) and (S) (although the latter is often implicit).”

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  1. Gisin N. On the impossibility of covariant nonlocal 'hidden' variables in quantum physics. e-print arXiv:1002.1390 (2010). · arXiv

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Authors
Colbeck, R., & Renner, R.
Affiliations
  • Perimeter Institute (CA)
  • ETH Zurich (CH)
Corresponding author
Colbeck, Roger
Venue
Nature Communications
Published
2011-08-02
Volume
2
Issue
1
Pages
411-411
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2144820907
Cited by
223
References
42
Citations by year
2026: 5 · 2025: 7 · 2024: 8 · 2023: 15 · 2022: 7 · 2021: 28 · 2020: 10 · 2019: 11 · 2018: 12 · 2017: 12 · 2016: 23 · 2015: 22 · 2014: 28 · 2013: 20 · 2012: 14
FWCI
10.77
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by-nc-sa)
  • arXiv (Cornell University)
  • ETH Zürich Research Collection
Funders
  • National Science Foundation
  • Government of Canada
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (119868, 200021)
  • Industry Canada
  • Institut Périmètre de physique théorique
  • FP7 Ideas: European Research Council (258932)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Noncommutative and Quantum Gravity Theories
Keywords
quantum foundations, quantum indeterminism, EPR paradox, quantum cryptography, probabilistic forecasting

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