Localization stabilized by noise |
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| Authors: | Ph Blanchard G Bolz M Cini G F De Angelis M Serva |
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| Institution: | (1) Theoretische Physik and BiBoS, Universität Bielefeld, 4800 Bielefeld 1, Germany;(2) Dipartimento di Fisica, Università  La Sapienza , 00185 Rome, Italy;(3) Dipartimento di Matematica, Università La Sapienza, 00185 Rome, Italy;(4) Dipartimento di Matematica and INFN, Università dell'Aquila, Coppito, 67010 L'Aquila, Italy |
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| Abstract: | We present a model which describes a quantum two-state system interacting with the environment represented by stochastic noise. We show that coherent tunneling between the two states survives if the interaction with the environment is weak. On the contrary, a strong interaction destroys quantum coherence and the system randomly jumps from one state to the other. Moreover, the jump probability rate becomes extremely small for very strong noise. The model is relevant for understanding the quantum properties of some mesoscopic systems. |
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| Keywords: | Quantum tunneling stochastic processes |
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