151 citations · 723 across the 24 of their papers we have counts for
Showing 2003Show all
3 papers · 1 filter
quant-ph2003
Time-dependent Displaced and Squeezed Number States
Sang Pyo Kim
We generalize the wave functions of the displaced and squeezed number states, found by Nieto, to a time-dependent harmonic oscillator with variable mass and frequency. These time-d…
quant-ph2003★ 1 cited
Thermofield Dynamics of Time-Dependent Boson and Fermion Systems
Sang Pyo Kim, F. C. Khanna
We formulate the thermofield dynamics for time-dependent systems by combining the Liouville-von Neumann equation, its invariant operators, and the basic notions of thermofield dyna…
quant-ph2003
Invariant Operators vs Heisenberg Operators for Time-Dependent Generalized Oscillators
Sang Pyo Kim
We investigate the relation between the invariant operators satisfying the quantum Liouville-von Neumann and the Heisenberg operators satisfying the Heisenberg equation. For time-d…