`The no-signaling condition and quantum dynamics

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Authors	SIMON C. BŮŽEK Vladimír GISIN N.
Year of publication	2001
Type	Article in Periodical
Magazine / Source	Physical Review Letters
MU Faculty or unit	Faculty of Informatics
Citation
Field	Informatics
Keywords	BELL INEQUALITIES MECHANICS EQUATIONS VIOLATION LOCALITY
Description	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, and (3) superluminal communication is excluded. This result also constrains possible nonlinear modifications of quantum physics.
Related projects:	Informatics as the third methodology Non-sequential Models of Computing -- Quantum and Concurrent Distributed Models of Computing