Nonclassical evolution of a free particle
arXiv:quant-ph/9804002
Abstract
A conditional kinetic energy is defined in terms of the Wigner distribution. It is shown that this kinetic energy may become negative for negative Wigner distributions. A free particle wave packet with negative kinetic energy will spread in a nonclassical manner.
To appear in proceedings of the 5th International Conference on Squeezed States and Uncertainty Relations