Marco G. Pala

Publications (2)0 Total impact

• Source

  Available from: Paolo Grigolini

  Article: Quantum Measurement and Entropy Production

  Paolo Grigolini, Marco G. Pala, Luigi Palatella
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  ABSTRACT: We study the time evolution of a quantum system without classical counterpart, undergoing a process of entropy increase due to the environment influence. We show that if the environment-induced decoherence is interpreted in terms of wave-function collapses, a symbolic sequence can be generated. We prove that the Kolmogorov-Sinai entropy of this sequence coincides with rate of von Neumann entropy increase. Comment: 5 pages, 2 figures
  07/2000;
• Source

  Available from: Paolo Grigolini

  Article: Decoherence, wave function collapses and non-ordinary statistical mechanics

  Mauro Bologna, Paolo Grigolini, Marco G. Pala, Luigi Palatella
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  ABSTRACT: We consider a toy model of pointer interacting with a 1/2-spin system, whose σx variable is measured by the environment, according to the prescription of decoherence theory. If the environment measuring the variable σx yields ordinary statistical mechanics, the pointer sensitive to the 1/2-spin system undergoes the same, exponential, decoherence regardless of whether real collapses or an entanglement with the environment, mimicking the effect of real collapses, occur. In the case of non-ordinary statistical mechanics the occurrence of real collapses make the pointer still relax exponentially in time, while the equivalent picture in terms of reduced density matrix generates an inverse power law decoherence.
  Chaos, Solitons & Fractals.