02 1 v 1 2 1 N ov 1 99 7 Spontaneous Decoherence in Coupled Quantum Kicked Rotators

/ 02 08 09 0 v 2 1 7 M ar 2 00 3 Measurements of Diffusion Resonances for the Atom Optics Quantum Kicked

We present experimental observations of diffusion resonances for the quantum kicked rotor with weak decoherence. Cold caesium atoms are subject to a pulsed standing wave of near-resonant light, with spontaneous emission providing environmental coupling. The mean energy as a function of the pulse period is determined during the late-time diffusion regime for a constant probability of spontaneous...

/ 02 08 03 5 v 2 7 N ov 2 00 2 Kicked Rotor in Wigner Phase Space

We develop the Wigner phase space representation of a kicked particle for an arbitrary but periodic kicking potential. We use this formalism to illustrate quantum resonances and anti–resonances.

ar X iv : q ua nt - p h / 99 05 05 1 v 1 1 7 M ay 1 99 9 A Numerical Investigation of the Effects of Classical Phase Space Structure on a Quantum System

We present a detailed numerical study of a chaotic classical system and its quantum counterpart. The system is a special case of a kicked rotor and for certain parameter values possesses cantori dividing chaotic regions of the classical phase space. We investigate the diffusion of particles through a cantorus; classical diffusion is observed but quantum diffusion is only significant when the cl...

ar X iv : c on d - m at / 9 91 10 15 v 1 2 N ov 1 99 9 Effect of transport coefficients on the time - dependence of density matrix

For Lindblad's master equation of open quantum systems with a general quadratic form of the Hamiltonian, the propagator of the density matrix is analytically calculated by using path integral techniques. The time-dependent density matrix is applied to nuclear barrier penetration in heavy ion collisions with inverted oscillator and double-well potentials. The quantum mechanical decoherence of pa...

ar X iv : h ep - e x / 97 11 02 0 v 1 2 6 N ov 1 99 7 CLNS 97 / 1521