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Quantum Entanglement & Spooky Action at a Distance

Veritasium · explainer · Watch on YouTube

Quantum physics

What it is

Veritasium explains quantum entanglement and spooky action at a distance, walking through Bell's inequality and the experiments that rule out hidden variables, in under ten minutes.

Why Hacker News recommends it

HN recommends it as one of the clearest layman explanations of Bell's theorem.

  • 9 people recommended it
  • 9 different months
  • 2 strong recommendations
  • first 2015, last 2022

What HN commenters said

  1. “I can't recommend Veritasium and CGP Grey enough.”

    Explains a difficult quantum topic in under ten minutes.

    slaxman, 2015-09 · Strong recommendation · in “Informative YouTube channels”

  2. “It's my favorite video for explaining how we know that the state is not determined until it has been measured.”

    Shows why quantum state is undetermined until measured.

    gibybo, 2015-11 · Strong recommendation · in “The quantum source of space-time”

  3. “There's a pretty good Veritasium video that explains one such experiment in non-physicist terms”

    Explains a Bell test experiment in non-physicist terms.

    gbelote, 2015-02 · Recommendation · in “Quantum Physics and the Abuse of Reason”

  4. “is a good overview that I really like for Bell's inequality.”

    Good overview of Bell's inequality.

    blueplanet200, 2016-08 · Recommendation · in “Interactive explanation of the quantum Bell test”

  5. “One of the better explanations I've seen is regarding measuring spin with three state detectors”

    Clear explanation using spin measurements with three detectors.

    strmpnk, 2017-01 · Recommendation · in “Bell's Theorem: No EPR “Reality””

  6. “this 9 minute video explains how Bell proved that the particles can't have been given opposite”

    Nine-minute explanation of how Bell ruled out hidden information.

    CookieMon, 2018-02 · Recommendation · in “You thought quantum mechanics was weird: check out entangled time”

  7. “actually, this is a much better video”

    Less technical, more visual layman's explanation of Bell's result.

    chii, 2019-03 · Recommendation · in “Experimental rejection of observer-independence in the quantum world”

  8. “Veritasium has a good video explaining Bell's inequality”

    Good explanation of Bell's inequality.

    rhinokungfoo, 2022-07 · Recommendation · in “Record-setting quantum entanglement connects two atoms across 20 miles”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: bell inequality, hidden variables, entanglement, veritasium, quantum mechanics

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