No-faster-than-light-signaling implies linear evolution. A re-derivation
No-faster-than-light-signaling implies linear evolution. A re-derivation
There is a growing interest, both from the theoretical as well as experimental side, to test the validity of the quantum superposition principle, and of theories which explicitly violate it by adding nonlinear terms to the Schrödinger equation. We review the original argument elaborated by Gisin (1989 Helv. Phys. Acta …