Quantum dephasing by chaos
  We examine whether the chaotic behavior of classical systems with a limited number of degrees of freedom can produce quantum dephasing, against the conventional idea that dephasing takes place only in large systems with a huge number of constituents and complicated internal interactions. On the basis of this analysis, we briefly discuss the possibility of defining quantum chaos and of inventing a ``chaos detector". 
Hiromichi Nakazato, Mikio Namiki (Dept. of Phys, Waseda Univ., Japan),   Saverio Pascazio (Dipt. di Fisica, Univ. di Bari an...