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The Delayed Choice Quantum Eraser, Debunked

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.

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Why HN readers recommended it

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

This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.

Video & recommendation details

Creator / channel
Sabine Hossenfelder
Topic
quantum eraser experiment
Format
explainer
Level
intermediate
HN recommenders in dataset
5
HN mentions in dataset
6
Recommendation years in dataset
2021–2026

These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.

From the original HN conversations

Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.

  • Ok, that's definitely not what OP said. Of course the particle still can interfere with itself after the slit, it's just that when the measurement is made, the pattern of two waves interfering gets much weaker/non-existent. Also, the experiment you are alluding to does not …

    rafaelero on Hacker News · 2021-12
    In Does superdeterminism save quantum mechanics?

  • PBS Spacetime did an interesting video on DCQE, but it tripped me up trying to fully understand what was happening: [LINK] ... Later Sabine Hossenfelder did a video debunking the proposition that DCQE somehow showed that the past was being rewritten. [VIDEO] And Matt from …

    calny on Hacker News · 2025-02
    In Time Warp: Delayed-choice quantum erasure

  • This is a very interesting, novel take on explaining the delayed choice quantum eraser. I think I can summarize it as follows: The signal photon hits the screen, which is a measurement. The entangled idler's wave function is thereby constrained by that measurement, influencing the …

    anotherpaulg on Hacker News · 2025-02
    In Time Warp: Delayed-choice quantum erasure

Summaries, classifications and recommendation records are from the HackerTube source dataset. Read about this library and its limitations.

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