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The Delayed Choice Quantum Eraser, Debunked

Sabine Hossenfelder · explainer · Watch on YouTube

Quantum physics

What it is

Sabine Hossenfelder explains the delayed choice quantum eraser and argues it does not rewrite the past, as popular accounts claim. She walks through what the experiment actually shows.

Why Hacker News recommends it

HN recommends it as a clear debunking of the retrocausality interpretation of the quantum eraser.

  • 5 people recommended it
  • 4 different months
  • 0 strong recommendations
  • first 2021, last 2026

What HN commenters said

  1. “Perhaps you will be interested on another video from Sabine.”

    Sabine's video explaining the quantum eraser experiment

    rafaelero, 2021-12 · Recommendation · in “Does superdeterminism save quantum mechanics?”

  2. “Later Sabine Hossenfelder did a video debunking the proposition that DCQE somehow showed that the past was being rewritten.”

    Debunks the claim that delayed-choice eraser rewrites the past

    calny, 2025-02 · Recommendation · in “Time Warp: Delayed-choice quantum erasure”

  3. “Two other high quality discussions of eraser experiments are by Sean Caroll [0] and Sabine Hossenfelder [1].”

    High quality discussion demystifying eraser experiments

    anotherpaulg, 2025-02 · Recommendation · in “Time Warp: Delayed-choice quantum erasure”

  4. “you don't get "two clusters" actually. They are both statistical parts of a single [non-]interference pattern.”

    Shows the two-cluster picture in popsci videos is misleading

    wruza, 2025-03 · Recommendation · in “Did the Particle Go Through the Two Slits, or Did the Wave Function?”

  5. “She has a nice video on delayed-choice quantum eraser”

    Nice explanation of the delayed-choice quantum eraser

    TxFkdZ, 2026-07 · Recommendation · in “You probably misunderstand the double slit experiment [video]”

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

Topics: quantum mechanics, delayed choice, retrocausality, double slit, physics

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