Does Quantum Entanglement Allow for Faster-Than-Light Communication?

Item: Does Quantum Entanglement Allow for Faster-Than-Light Communication?
Rating: 5
Author: PostSingularity Institute

by David Kipping (Cool Worlds)

Formal & Physical Sciences Physics PHPhysics PHQQuantum physics (quantum mechanics and quantum field theory)

🎙 David Kipping (Cool Worlds) 👥 1.1M 📅 September 9, 2022 ⏱ 28 min 👁 1.6M 📄 science communication 🧭 2026-08-26

Available in: English (current) Français

Keywords

entanglementFTLno-communication theoremquantum measurementcausality

Summary

The video explores whether quantum entanglement could enable faster-than-light (FTL) communication, a common trope in science fiction. It begins by explaining the relativistic speed limit and the causality issues with FTL. Then it introduces quantum entanglement, its superposition nature, and the EPR paradox. The core of the video systematically debunks three proposed schemes for using entanglement to communicate: repeated measurements, double-slit interference, and switching measurement bases. Each scheme fails because the outcomes remain fundamentally random and Alice cannot distinguish Bob’s actions. The video concludes by explaining the no-communication theorem, which rigorously proves that quantum mechanics forbids FTL information transfer. It emphasizes that while entanglement is non-local, it does not violate causality. The presentation is clear, uses helpful analogies, and is fact-checked by experts. The final message encourages accepting the universe’s limits and focusing on what is possible.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides a high-value, rigorous explanation of why quantum entanglement cannot be used for FTL communication. It systematically addresses common misconceptions and proposed workarounds, each time explaining the physical reason for failure. The argumentation is solid, building from basic quantum principles to the no-communication theorem. The use of analogies (e.g., the shoe box) effectively illustrates the lack of information transfer. The presentation is balanced, acknowledging the appeal of FTL while firmly grounding the conclusion in established physics.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is high: the video is presented by a professor and fact-checked by three other professors. It cites key primary literature, including the EPR paper, Salart et al.’s measurement of non-local correlations, and Pawlowski et al.’s information causality principle. The title accurately reflects the content, which is a thorough investigation of the question. The video does not overstate its claims and clearly distinguishes between established results and speculative ideas.

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Title / Content Match

The title accurately reflects the content, which systematically explores and ultimately refutes the possibility of FTL communication via quantum entanglement.

Quality & Reliability

9/10

The video is presented by Prof. David Kipping and fact-checked by three professors (Ehud Altman, Tim Byrnes, Raquel Queiroz). It references key peer-reviewed papers (Einstein et al. 1935, Salart et al. 2008, Pawlowski et al. 2009, Gisin 2014) and explains the no-communication theorem accurately. The content is rigorous, well-structured, and avoids overclaiming.

Chapters

Cited Sources

Gisin (2014), "Quantum measurement of spins and magnets, and the classical limit of PR-boxes" — Referenced in the description as a source for the discussion on quantum measurements and non-locality.
Pawlowski et al. (2009), "Information causality as a physical principle" — Referenced in the description; supports the principle that information causality limits correlations.
Einstein et al. (1935), "Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?" — The EPR paper, foundational to the discussion of entanglement and the 'spooky action at a distance'.
Salart et al. (2008), "Testing spooky action at a distance" — Referenced in the description; provides experimental evidence for the non-local nature of entanglement.

Concurring Sources

No-communication theorem (Wikipedia) — Provides a formal proof that quantum entanglement cannot be used for FTL communication, aligning with the video's conclusion.
Quantum entanglement (Wikipedia) — General reference on entanglement, supporting the video's explanation of the phenomenon.

External References

Contribution & Novelties

The video offers a clear, step-by-step refutation of common FTL communication schemes based on entanglement, making the no-communication theorem accessible to a broad audience. It effectively combines theoretical explanations with concrete examples and analogies. The emphasis on causality as the fundamental speed limit, rather than just the speed of light, is a valuable insight.

Pour aller plus loin :

No-communication theorem — The formal proof that quantum entanglement cannot be used to transmit information.
Quantum entanglement — Overview of the phenomenon and its properties.
Information causality — A principle that constrains the strength of quantum correlations, as referenced in the video.

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Radar Profile

The radar profile shows high scores in information quality and reliability, with slightly lower but still strong scores in quantity and technical depth. This indicates a well-balanced, authoritative video that is both informative and accessible.

Reliability 9/10

💬 Très positif. Sur les 30 commentaires analysés, les spectateurs expriment une admiration unanime pour la clarté des explications et la rigueur scientifique, certains soulignant que c'est la première fois qu'ils comprennent réellement l'intrication quantique.