# Zeno's Paradox & The Quantum Zeno Effect

Page: https://stenobird.com/podcast/pbs-space-time-7778773/zeno-s-paradox-the-quantum-zeno-effect
Text version: https://stenobird.com/podcast/pbs-space-time-7778773/zeno-s-paradox-the-quantum-zeno-effect.md
Podcast: [PBS Space Time](https://stenobird.com/podcast/pbs-space-time-7778773)
Published: 2026-07-06T03:30:00+00:00
Episode link: https://traffic.megaphone.fm/VG2083485415.mp3
Audio file: https://traffic.megaphone.fm/VG2083485415.mp3
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JSON: https://stenobird.com/v1/public/podcasts/pbs-space-time-7778773/episodes/zeno-s-paradox-the-quantum-zeno-effect
Duration seconds: 1435

## Resource

Thank you for The Great Courses Plus for Supporting PBS. To learn more and try The Great Courses Plus click, http://ow.ly/ORgD30rA2tQ. PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime “A moving arrow is at rest.” This is obviously a nonsensical contradiction. But Zeno, a Greek philosopher famous for his metaphysical trolling, devised a paradox whose conclusion is just this. Here’s how it goes: if you look at an arrow flying through the air at any instantaneous snapshot in time, the arrow doesn’t travel any distance. If time is composed of an infinite number of these snapshots, and the arrow doesn’t move in any of them, then the arrow is at rest during the entirety of its flight. The moving arrow is at rest. In fact, if we’re talking about a quantum arrow, there may be a way to freeze its motion simply by looking at it, through the aptly named quantum Zeno effect. The quantum Zeno effect predicts that certain quantum events - like the electrons moving between atomic energy levels, or the decay of atomic nuclei, can be frozen through the simple act of observation. I’m going to tell you about some very real experiments that claim to have demonstrated this phenomenon. But first, let’s see if the quantum Zeno effect can save us from being shot by a quantum arrow. Check out the Space Time Merch Store https://www.pbsspacetime.com Sign up for the mailing list to get episode notifications and hear special announcements! https://mailchi.mp/1a6eb8f2717d/spacetime Hosted by Matt O'Dowd Written by Katie McCormick & Matt O'Dowd Graphics by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal & Stephanie Faria GFX…

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## Transcript

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