Coherent control of quantum chaotic diffusion: Diatomic molecules in a pulsed microwave field

Extensive phase control of quantum chaotic diffusion is demonstrated for di atomic molecules periodically kicked with microwave pulses. In particular, both complete suppression of chaotic diffusion as well as its enhancement c an be achieved by varying the phase of the initial superposition state. The origin of this control in deviations from random matrix theory is also dis cussed. The results should motivate experiments that are relevant to both c oherent control and to quantum chaos. (C) 2001 American Institute of Physic s.