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The studies on quantum open system play key roles not only in fundamentalproblems in quantum mechanics but also in quantum computing and informationprocesses. Here we propose a scheme to use a one dimensional coupling cavityarray (CCA) as an artificial electromagnetic environment of a two-level atom.For a finite length of CCA, we find that after a turning time the population ofexcited state deviates suddenly from the exponential decay. We show thatphysically this phenomena corresponds to a transition from a naked atom decayto a dressed state decay. We hope that our finding will promote the studies onquantum system with a finite size environment.

Sudden transition from naked atom decay to dressed atom decay