Phys. Rev. Lett. 72, 596–599 (1994)Causality problems for Fermi’s two-atom systemReceived 2 September 1993; published in the issue dated 31 January 1994 Let A and B be two atoms or, more generally, a ‘‘source’’ and a ‘‘detector’’ separated by some distance R. At t=0A is in an excited state, B in its ground state, and no photons are present. A theorem is proved that in contrast to Einstein causality and finite signal velocity the excitation probability of B is nonzero immediately after t=0. Implications are discussed. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.72.596
DOI:
10.1103/PhysRevLett.72.596
PACS:
03.65.Bz
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