Physics – Quantum Physics
Scientific paper
2000-12-11
In "Geometry, Integrability and Quantization", eds: I.Mladenov and G.Naber (Coral Press, 2001) pp. 294-312
Physics
Quantum Physics
18 pages, Latex, no figures. To appear in the Proceedings of the Second Int. Conference on Geometry, Integrability and Quantiz
Scientific paper
The problem of diagonalization of Hamiltonians of N-dimensional boson systems by means of time-dependent canonical transformations (CT) is considered, the case of quadratic Hamiltonians being treated in greater detail. The unitary generator of time-dependent CT which can transform any Hamiltonian to that of a system of uncoupled stationary oscillators is constructed. The close relationship between methods of canonical transformations, time-dependent integrals of motion and dynamical symmetry is noted. The diagonalization and symplectic properties of the uncertainty matrix for 2N canonical observables are studied. It is shown that the normalized uncertainty matrix is symplectic for the squeezed multimode Glauber coherent states and for the squeezed Fock states with equal photon numbers in each mode. The Robertson uncertainty relation for the dispersion matrix of canonical observables is shown to be minimized in squeezed coherent states only.
Trifonov Dimitar A.
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