Decoherence and Phase Transitions in Quantum Dynamics |
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Authors: | Gaveau B Schulman L S |
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Institution: | 1.University of Paris VI, 4 pl. Jussieu, 75005, Paris, France ;2.Physics Department, Clarkson University, Potsdam, NY, 13699-5820, USA ;3.Max Planck Institute for the Physics of Complex Systems, N?thnitzer Str. 38, 01187, Dresden, Germany ; |
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Abstract: | A particle with internal degrees of freedom is in contact with a bath of photons (necessitating a relativistic treatment). The occurrence of decoherence is established and the density matrix is found to be diagonal in momentum space. In the case of non-trivial internal degrees of freedom and selection rules there is a first order phase transition separating those degrees of freedom. Finally, because probability amplitudes become probabilities, Einstein’s proposal that more than one detector could respond to a signal is answered. |
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