H. Nakazato et S. Pascazio, A COHERENT UNDERSTANDING OF SOLVABLE MODELS FOR QUANTUM MEASUREMENT PROCESSES, Physics letters. A, 192(2-4), 1994, pp. 169-174
By making use of Schwinger's oscillator model of angular momentum, we
put forward an interesting connection among three solvable Hamiltonian
s, widely used for discussions on the quantum measurement problem. Thi
s connection implies that a particular macroscopic limit has to be tak
en for these models to be physically sensible.