Wigner’s Friend: Can Two Observers See Different Realities?

Nova measures a particle inside a sealed lab and sees “up.” But for Qubit, standing outside, quantum physics says she’s still in a blend of both answers. Who’s right? This 1961 thought experiment has become a real lab test, and it shapes how quantum computers are built. 0:00 One lab, two observers 0:49 Quick reminder: superposition & measurement 1:38 Wigner’s thought experiment 2:40 Quiz: who’s right? 3:09 The main interpretations 4:22 Four observers, one contradiction 5:14 Real experiments with photons 6:15 Why it matters: quantum computers Is there one single reality everyone shares, or can two observers both be right? Tell us in the comments! #physics #quantumphysics #wignersfriend #quantumcomputing #science