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

PBS Space Time · 2.9M views · 2016-08-10 · 14:40

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Overview

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.

On Hacker News

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

Recommended by 4 HN people across 4 months · HN mentions 2017–2025

Topics

Quantum physics
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double slitdelayed choicecausalityquantum mechanicspbs space time

What people said

mbell · 2020-02 · Recommendation

If you place a detector in front of (or behind!) the slits the wave function collapses and there is no interference pattern. This is all part of the mystery of it, as soon as you 'observe' a particle, in any way, it stops acting like a wave. See the Delayed Choice Quantum Eraser experiment for even more weirdness, a good video on it: [VIDEO]

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mitchty · 2019-10 · Recommendation

Indeed, a quick video from space time for those being first introduced. It’ll likely make you even more confused to the double slit experiment. [VIDEO]

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comboy · 2019-03 · Recommendation

Here's a dumbed down version: [LINK] Also not directly related video if you like your mind being blown: [VIDEO] Especially given how our understanding of the world changed during the last 200 years, I would say we are still very much clueless. I find that exciting. Btw, no idea why did researchers get "freedom of choice" involved.

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Sources

Video by PBS Space Time, played through YouTube.

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