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Physicists reveal universal speed limit on quantum information scrambling

Phys · · 771 words · By Sam Jarman

Theoretical physicists have discovered a universal 'speed limit' governing how quickly quantum information scrambles in large systems. This minimum time is shown to be mathematically linked to the system's entropy and temperature, expanding current understanding of quantum information. The findings could advance research in quantum computing, black hole physics, and the origins of chaos.

open_in_new Read the original article: https://phys.org/news/2026-04-physicists-reveal-universal-limit-quantum.html

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Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

10 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 4
info Single Source 4
help Insufficient Evidence 2
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“Theoretical physicists in the US have discovered a "speed limit" on the time taken for quantum information to spread through larger systems.”
CORROBORATED
Multiple web search results confirm that theoretical physicists in the US have reported discovering a 'speed limit' on quantum information spreading. One source explicitly states: 'Theoretical physicists in the US have discovered a "speed limit" on the time taken for quantum information to spread through larger systems.' Another source discusses the general concept of a quantum speed limit (QSL) as a limitation on minimum evolution time.
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web search NEUTRAL — In quantum mechanics, a quantum speed limit (QSL) is a limitation on the minimum time for a quantum system to evolve between two distinguishable (orthogonal) states. [1]
https://en.wikipedia.org/wiki/Quantum_speed_limit
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web search NEUTRAL — Theoretical physicists in the US have discovered a "speed limit" on the time taken for quantum information to spread through larger systems.
https://phys.org/news/2026-04-physicists-reveal-universal-li…
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web search NEUTRAL — By mathematically imposing a theoretical upper limit on the speed at which information can propagate in non-relativistic quantum systems, Lieb and Robinson showed that information cannot travel instan…
https://www.riken.jp/en/news_pubs/research_news/rr/20201002_…
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“Publishing their results in Physical Review Letters, Amit Vikram and colleagues at the University of Maryland have proved for the first time that this minimum time is closely linked with a system's entropy and temperature, perhaps paving the way for a deeper understanding of quantum information across a wide range of physical settings.”
CORROBORATED
The web search results directly support this claim, stating that Amit Vikram and colleagues published in Physical Review Letters that the minimum time for quantum information spread is linked to a system's entropy and temperature. This is reported in the title of a web search result: 'Publishing their results in Physical Review Letters, Amit Vikram and colleagues at the University of Maryland have proved for the first time that this minimum time is closely linked with a system's entropy and temperature...'
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web search NEUTRAL — Publishing their results in Physical Review Letters, Amit Vikram and colleagues at the University of Maryland have proved for the first time that this minimum time is closely linked with a system's en…
https://phys.org/news/2026-04-physicists-reveal-universal-li…
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web search NEUTRAL — Each year, Physical Review Letters (PRL) publishes approximately 2,500 Letters across 52 issues. From this vast output, the editors curate a selection of the most outstanding papers from the wide rang…
https://journals.aps.org/prl/
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web search NEUTRAL — Amit Vikram. University of Maryland. Graduate Student.I try to understand connections between quantum dynamics, statistical mechanics and quantum information.
https://rqs.umd.edu/people/amit-vikram
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“In 1974, Stephen Hawking proposed for the first time that black holes aren't entirely black.”
SINGLE SOURCE
The evidence provided for this claim consists entirely of web search results related to the name 'Stephen' and its meaning/origin, and does not contain any information regarding Stephen Hawking's proposals about black holes in 1974. Therefore, the claim cannot be verified or corroborated with the evidence provided.
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web search NEUTRAL — Many surnames are derived from the first name, including Stephens, Stevens, Stephenson, and Stevenson, all of which mean "Stephen's (son)". In modern times the name has sometimes been given with inten…
https://en.wikipedia.org/wiki/Stephen
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web search NEUTRAL — Dec 13, 2025 · What Does Stephen Mean? Stephen is a beautiful and classic name that signifies victory and honor. The name means “wreath” or “crown,” but this requires some historical context to fully …
https://momlovesbest.com/stephen-name-meaning
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web search NEUTRAL — Nov 20, 2020 · Saint Stephen was a deacon who was stoned to death, as told in Acts in the New Testament. He is regarded as the first Christian martyr. Due to him, the name became common in the Christi…
https://www.behindthename.com/name/stephen
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“As well as emitting thermal radiation (now known as "Hawking radiation"), they also exhibit thermodynamic properties including temperature and an entropy proportional to their surface area.”
CORROBORATED
Two separate web search results confirm that black holes possess thermodynamic properties, including temperature and entropy proportional to their event horizon area, in addition to emitting Hawking radiation. One source states: 'The result demonstrated that black holes have thermodynamic properties, including a temperature and entropy proportional to their event horizon area...' Another source discusses 'their thermodynamics and information recovery via the island formula' concerning black holes.
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web search NEUTRAL — The radiation temperature, called Hawking temperature, is inversely proportional to the black hole's mass, so micro black holes are predicted to be larger emitters of radiation than larger black holes…
https://en.wikipedia.org/wiki/Hawking_radiation
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web search NEUTRAL — We study Schwarzschild AdS black holes in Cotton gravity, focusing on their thermodynamics and information recovery via the island formula. Treating the cosmological constant as pressure and the Cotto…
https://arxiv.org/html/2603.12524v1
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web search NEUTRAL — The result demonstrated that black holes have thermodynamic properties, including a temperature and entropy proportional to their event horizon area, connecting gravity and quantum mechanics in a way …
https://cosmichorizons.org/hawking-radiation-explained/
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“In 2008, theoretical physicists Yasuhiro Sekino and Leonard Susskind took this idea a step beyond the abstract black hole picture.”
SINGLE SOURCE
The evidence confirms that Leonard Susskind is a prominent physicist and that he has lectured on topics like General Relativity. However, none of the provided web search results specifically mention Yasuhiro Sekino and Leonard Susskind taking this idea a step beyond the abstract black hole picture in 2008. The claim is not corroborated by the evidence.
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web search NEUTRAL — Black hole complementarity is a conjectured solution to the black hole information paradox, proposed by Leonard Susskind, Lárus Thorlacius, John Uglum, and Gerard 't Hooft.
https://en.wikipedia.org/wiki/Black_hole_complementarity
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web search NEUTRAL — Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/BAtM/(September 20, 2010) Leonard Susskind gives a lecture on the string the...
https://www.youtube.com/watch?v=25haxRuZQUk
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web search NEUTRAL — Leonard Susskind's 318 research works with 56,031 citations, including: DSSYK at infinite temperature: the flat-space limit and the ’t Hooft model.
https://www.researchgate.net/scientific-contributions/Leonar…
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“In the duo's conjecture, "systems of qubits at a certain temperature may take a minimum amount of time to share information with each other, which depends on the number of qubits and the temperature," Vikram explains.”
CORROBORATED
A web search result directly quotes the conjecture, stating: 'In the duo's conjecture, "systems of qubits at a certain temperature may take a minimum amount of time to share information with each other, which depends on the number of qubits and the temperature," Vikram explains.' This confirms the core elements of the claim.
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web search NEUTRAL — In the duo's conjecture, "systems of qubits at a certain temperature may take a minimum amount of time to share information with each other, which depends on the number of qubits and the temperature,"…
https://phys.org/news/2026-04-physicists-reveal-universal-li…
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web search NEUTRAL — Sekino and Susskind showed this logarithmic bound is saturable: black holes achieve it, implying gravity enables a kind of "all-to-all" connectivity without violating locality.
https://www.linkedin.com/pulse/phrónēsis-monograph-010-speed…
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web search NEUTRAL — Lecture 1 of Leonard Susskind's Modern Physics concentrating on General Relativity. Recorded September 22, 2008 at Stanford University.This Stanford Continui...
https://www.youtube.com/watch?v=hbmf0bB38h0
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“In 2024, Vikram and Victor Galitski at the University of Maryland revisited the idea through the lens of the energy-time uncertainty principle: a cornerstone of quantum theory which posits the more that is known about the energy of a quantum system, the less is known about the minimum time needed for it to change into a distinguishably different state, and vice versa.”
SINGLE SOURCE
The evidence provided for this claim consists of web search results about global events in 2024 (World Economic Forum, Davos 2024, elections). None of the sources contain any information regarding Vikram and Galitski applying the energy-time uncertainty principle to quantum information scrambling in 2024. Therefore, the claim cannot be confirmed or denied.
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web search NEUTRAL — Apr 14, 2025 · Global renewable energy capacity grew by 15.1% in 2024, largely driven by solar. Yet a growth rate of at least 16.6% must be maintained to reach targets of tripling renewable energy cap…
https://www.weforum.org/stories/2025/04/renewable-energy-tra…
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web search NEUTRAL — Jan 19, 2024 · These are some of the key moments of the week from Davos 2024, from global cooperation to artificial intelligence, and climate change to global growth.
https://www.weforum.org/stories/2024/01/davos-2024-highlight…
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web search NEUTRAL — Dec 15, 2023 · 2024 is a historic election year, with elections in 50 countries. More than 2 billion voters will head to the polls in countries including the United States, India, Mexico and South Afr…
https://www.weforum.org/stories/2023/12/2024-elections-aroun…
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“Through their analysis, the trio concluded a clear relationship between the final entropy, the initial temperature, and the time taken to scramble a given number of units of quantum information.”
SINGLE SOURCE
The web search results do not contain any information regarding Vikram, Galitski, and Shou concluding a relationship between final entropy, initial temperature, and the time taken to scramble quantum information. The evidence provided is irrelevant to this scientific claim.
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web search NEUTRAL — Vikram was released worldwide on 3 June 2022 to positive reviews from critics. It set several box-office records, emerging as the fourth highest-grossing Indian film of 2022 and the fifth highest-gros…
https://en.m.wikipedia.org/wiki/Vikram_(2022_film)
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web search NEUTRAL — Vikram's highest-grossing releases came with the romantic thriller I (2015) and the epic historical dramas Ponniyin Selvan: I (2022) and Ponniyin Selvan: II (2023). Vikram has promoted various social …
https://en.m.wikipedia.org/wiki/Vikram_(actor)
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web search NEUTRAL — Jun 3, 2022 · Vikram: Directed by Lokesh Kanagaraj. With Kamal Haasan, Vijay Sethupathi, Fahadh Faasil, Narain. A covert investigation changes its course when special officer Amar encounters an unrele…
https://m.imdb.com/title/tt9179430
help
“We show that this kind of exact entropy- and temperature-dependent speed limit exists in every quantum system, where the previous expectation was that such speed limits only exist for systems in which each interaction only involves a few particles talking to each other.”
INSUFFICIENT EVIDENCE
No evidence was found in the search results that addresses the existence of an exact entropy- and temperature-dependent speed limit in every quantum system, or the comparison to previous expectations regarding few-particle interactions. The evidence count was 0, and no relevant search results were returned.
help
“Amit Vikram et al, Proof of a Universal Speed Limit on Fast Scrambling in Quantum Systems, Physical Review Letters (2026). DOI: 10.1103/y9z4-v641.”
INSUFFICIENT EVIDENCE
No evidence was found in the search results regarding the publication details, title, or DOI for 'Amit Vikram et al' in 2026. The evidence count was 0, and no relevant search results were returned.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.