Photons multiply infinitely when partially reflected by fast mirror

A new theoretical study shows that attempting to divide a photon with a rapidly moving mirror creates a superposition of infinitely many photons instead of shortening the original particle.

Researchers led by Johannes Skaar at the University of Oslo examined what happens when a photon encounters a mirror moving fast enough to reflect only part of its wave-like tail. Quantum equations for the electromagnetic field revealed that the interaction produces a state mixing infinitely many photons due to fluctuations in the quantum vacuum.

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