An Efficient and Accurate Quantum Lattice-Gas Model for the Many-Body Schroedinger Wave Equation
AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
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Presented is quantum lattice-gas model for simulating the time-dependent evolution of a many-body quantum mechanical system of particles governed by the non-relativistic Schrodinger wave equation with an external scalar potential. A variety of computational demonstrations are given where the numerical predictions are compared with exact analytical solutions. In all cases, the model results accurately agree with the analytical predictions and we show that the models error is second-order in the temporal discretization and fourth-order in the spatial discretization The difficult problem of simulating a system of fermionic particles is also treated and a general computational formulation if this problem is given. For pedagogical purposes, the two-particle case is presented and the numerical dispersion of the simulated wave packets is compared with the analytical solutions.
- Operations Research
- Quantum Theory and Relativity