The low-density limit in terms of collective squeezed vectors
Sławomir Rudnicki, Robert Alicki, Sławomir Sadowski · Journal of Mathematical Physics · 1992
The low-density limit for a quantum system interacting with a free Bose or Fermi gas is considered. For the particular choice of reference vectors (collective squeezed vectors) one proves the convergence of the associated matrix elements of the evolution operator to the matrix elements of the unitary quantum stochastic process driven by the quantum Poisson noise.