Quantum corrections to the dynamics of interacting bosons: beyond the truncated Wigner approximation

Details Quantum corrections to the dynamics of interacting bosons: beyond the truncated Wigner approximation Quantum corrections to the dynamics of interacting bosons: beyond the truncated Wigner approximation

2003-03-30

arxiv.org/abs/cond-mat/0303628v3

Phys. Rev. A, vol. 68 (5), 053604 (2003)

Physics

Condensed Matter

Statistical Mechanics

published version

Scientific paper

10.1103/PhysRevA.68.053604

We develop a consistent perturbation theory in quantum fluctuations around the classical evolution of a system of interacting bosons. The zero order approximation gives the classical Gross-Pitaevskii equations. In the next order we recover the truncated Wigner approximation, where the evolution is still classical but the initial conditions are distributed according to the Wigner transform of the initial density matrix. Further corrections can be characterized as quantum scattering events, which appear in the form of a nonlinear response of the observable to an infinitesimal displacement of the field along its classical evolution. At the end of the paper we give a few numerical examples to test the formalism.

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