The no-signaling condition and quantum dynamics

Details The no-signaling condition and quantum dynamics The no-signaling condition and quantum dynamics

2001-02-23

arxiv.org/abs/quant-ph/0102125v1

Phys. Rev. Lett. 87, 170405 (2001)

Physics

Quantum Physics

4 pages

Scientific paper

10.1103/PhysRevLett.87.170405

We show that the basic dynamical rules of quantum physics can be derived from its static properties and the condition that superluminal communication is forbidden. More precisely, the fact that the dynamics has to be described by linear completely positive maps on density matrices is derived from the following assumptions: (1) physical states are described by rays in a Hilbert space, (2) probabilities for measurement outcomes at any given time are calculated according to the usual trace rule, (3) superluminal communication is excluded. This result also constrains possible non-linear modifications of quantum physics.

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