- We propose a possible way to realize nuclear fusion, via an approach which involves aligned molecules. We compare results from quantum and classical simulations of two nuclei originating from an HT molecule moving under a superintense (field intensities approaching 1023 W/ cm2) and ultrashort (few-femtosecond, single-cycle) laser pulse. Classical simulations show that when the field is strong enough, it may make the nuclei collide with high kinetic energy needed to overcome the Coulomb barrier, therefore leading to fusion. A quantum-mechanical calculation solving the Schrdinger equation displays analogous behavior and reveals additional information about the wave packet evolution around the collision point. 2009 The American Physical Society.