Testing Quantum Dynamics using Signaling

Details Testing Quantum Dynamics using Signaling Testing Quantum Dynamics using Signaling

2004-01-30

arxiv.org/abs/quant-ph/0401186v2

Phys. Rev. A 72, 014304 (2005)

Physics

Quantum Physics

4 pages, 2 figures, RevTeX4; v2: published version

Scientific paper

10.1103/PhysRevA.72.014304

We consider a physical system in which the description of states and measurements follow the usual quantum mechanical rules. We also assume that the dynamics is linear, but may not be fully quantum (i.e unitary). We show that in such a physical system, certain complementary evolutions, namely cloning and deleting operations that give a better fidelity than quantum mechanically allowed ones, in one (inaccessible) region, lead to signaling to a far-apart (accessible) region. To show such signaling, one requires certain two-party quantum correlated states shared between the two regions. Subsequent measurements are performed only in the accessible part to detect such phenomenon.

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