Why Quantum Entanglement Can’t Send Faster-Than-Light Messages

October 20, 2026 4:15 pm ·

Entanglement produces instant correlations but cannot carry faster-than-light messages, a limit formalized by the no-communication theorem. Its fragility under measurement makes it a powerful tool for eavesdropper-proof encryption instead.

From 'Is Entanglement the Key to a Theory of Quantum Gravity? with Sean Hodgman': https://youtu.be/bfFuHg0kurE?si=PFKxpIXbfySNxr2H

Get the NEW StarTalk book, 'Lost in Space: 5,000 Facts for Navigating the Universe' on Amazon: https://amzn.to/4cCD19e

Support us on Patreon: https://www.patreon.com/startalkradio

FOLLOW or SUBSCRIBE to StarTalk:
Twitter: http://twitter.com/startalkradio
Facebook: https://www.facebook.com/StarTalk
Instagram: https://www.instagram.com/startalk
TikTok: https://www.tiktok.com/@neildegrassetyson

You’ve stumbled upon the newest addition to the StarTalk Multiverse—welcome! This is where we’ll post podcast highlights and fun original content that doesn’t quite fit on the main channel.