Uploaded June 2019 | Updated September 2026, 2 weeks ago

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Do quantum particles actually know if they're being watched like the double-slit experiment suggests? Does the delayed-choice quantum eraser finally prove this? No, but let's ask some better questions and see what's going on.
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VIDEO ANNOTATIONS/CARDS

How do we KNOW light is a wave?
youtu.be/aQ4KzsoCfYg

What the HECK is a Photon?!
youtu.be/73XdlgzSKws

How Do Polarized Sunglasses Work?!
youtu.be/c9ew1J0PY-M

Three Quantum Myths:
youtu.be/Q2OlsMblugo
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RELATED YOUTUBE VIDEOS

PBS Space Time on Quantum Eraser:
youtu.be/8ORLN_KwAgs

Vertasium on Single Photons:
youtu.be/GzbKb59my3U

Eugene Khutoryansky on Quantum Eraser:
youtu.be/SzAQ36b9dzs
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OTHER SOURCES

http://www.feynmanlectures.caltech.edu/III_01.html
http://adsabs.harvard.edu/abs/1982PhRvA..25.2208S
arxiv.org/abs/quant-ph/9903047
arxiv.org/abs/1112.4522
motls.blogspot.com/2010/11/delayed-choice-quantum-eraser.html
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LINKS TO COMMENTS

Quantum Eraser:
youtube.com/watch?v=Q2OlsMblugo&lc=Ugw5mhzuYAQHeDqOjFh4AaABAg
youtube.com/watch?v=Q2OlsMblugo&lc=Ugw6eUf24gJo0dsNwrB4AaABAg
youtube.com/watch?v=Q2OlsMblugo&lc=UgzWH05YDhO0JJe6N3h4AaABAg
youtube.com/watch?v=Q2OlsMblugo&lc=UgxuW_XKcoRkHiaG2H94AaABAg

Photoelectric Effect:
youtube.com/watch?v=aQ4KzsoCfYg&lc=UgwV84lrvPvlXbNQh114AaABAg
youtube.com/watch?v=aQ4KzsoCfYg&lc=Ugzs5XpJtY0CHLSoqjF4AaABAg
youtube.com/watch?v=aQ4KzsoCfYg&lc=UgxU0ObjtFzuMpmpwqJ4AaABAg
youtube.com/watch?v=aQ4KzsoCfYg&lc=Ugy4vhLkxjf3Gl8JMat4AaABAg