Curie-Weiss model of the quantum measurement process

  title={Curie-Weiss model of the quantum measurement process},
  author={Armen E. Allahverdyan and Roger Balian and Th. M. Nieuwenhuizen},
– A Hamiltonian model is solved, which satisfies all requirements for a realistic ideal quantum measurement. The system S is a spin1 2 , whose z-component is measured through coupling with an apparatus A = M + B, consisting of a magnet M formed by a set of N 1 spins with quartic infinite-range Ising interactions, and a phonon bath B at temperature T . Initially A is in a metastable paramagnetic phase. The process involves several time-scales. Without being much affected, A first acts on S… CONTINUE READING


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