## Solvable quantum version of an integrable Hamiltonian system

Solvable quantum versions of the classical dynamical system characterized by the Hamiltonian {ital H}={summation}{sup {ital n}}{sub {ital j},{ital k}=1}{ital p}{sub {ital jp}}{sub {ital k}}[{lambda}+{mu}cos({ital q}{sub {ital j}}{minus}{ital q}{sub {ital k}}) ] are presented. The eigenvalues of the quantum Hamiltonians are exhibited, as well as the corresponding eigenfunctions. {copyright} {ital 1996 American Institute of Physics.}