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How the Quantum Eraser Rewrites the Past | Space Time | PBS Digital Studios

PBS Space Time · explainer · Watch on YouTube

Quantum physics

What it is

PBS Space Time explains the quantum eraser experiment, in which erasing which-path information appears to reverse causality in a double-slit setup. It discusses what this means for quantum mechanics.

Why Hacker News recommends it

HN recommends it as a quick introduction to the quantum eraser and delayed choice weirdness, though one commenter notes later corrections to its framing.

  • 4 people recommended it
  • 4 different months
  • 0 strong recommendations
  • first 2017, last 2025

What HN commenters said

  1. “if you'd like to know more about this experiment and why it has ridiculous implications, check this PBS clip”

    Explains the quantum eraser experiment and its implications.

    chakalakasp, 2017-03 · Recommendation · in “NIST Physicists Show Ion Pairs Perform Enhanced 'Spooky Action'”

  2. “Also not directly related video if you like your mind being blown”

    Mind-blowing video about quantum weirdness.

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

  3. “a quick video from space time for those being first introduced”

    Quick introduction to the quantum eraser for newcomers

    mitchty, 2019-10 · Recommendation · in “Double Slit Experiment No Mystery”

  4. “See the Delayed Choice Quantum Eraser experiment for even more weirdness, a good video on it”

    Good explanation of the delayed choice quantum eraser experiment

    mbell, 2020-02 · Recommendation · in “Double Slits with Single Atoms”

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

Topics: double slit, delayed choice, causality, quantum mechanics, pbs space time

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