We predict analytically and confirm numerically the existence of sharply localized quantum states in an ultra-strong circularly polarized electromagnetic field with the probability density that represents non-classical wave packets moving around strongly unstable classical circular orbits.

OPG
doi.org/10.1364/OE.8.000112
Opt. Express

Kalinski, M. (2001). Quantum localization in circularly polarized electromagnetic field in ultra-strong field limit. Opt. Express, 8(2), 112–117. doi:10.1364/OE.8.000112