Decoherence scenarios from micro- to macroscopic superpositions

Details Decoherence scenarios from micro- to macroscopic superpositions Decoherence scenarios from micro- to macroscopic superpositions

2002-05-17

arxiv.org/abs/quant-ph/0205108v1

Physics

Quantum Physics

11 pages, 7 figures, accompanying paper to quant-ph/0204129

Scientific paper

10.1103/PhysRevA.67.022102

Environment induced decoherence entails the absence of quantum interference phenomena from the macroworld. The loss of coherence between superposed wave packets depends on their separation. The precise temporal course depends on the relative size of the time scales for decoherence and other processes taking place in the open system and its environment. We use the exactly solvable model of an harmonic oscillator coupled to a bath of oscillators to illustrate various decoherence scenarios: These range from exponential golden-rule decay for microscopic superpositions, system-specific decay for larger separations in a crossover regime, and finally universal interaction-dominated decoherence for ever more macroscopic superpositions.

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