Yes but the problem is that that would require something to eject out of the thruster, with terrestrial jet engines, this is air, of which there is a near inexhaustible supply of. In the void of space, there is nothing. So, a spaceship would require more and more fuel to eject. In a "nuclear engine" a working fluid, usually liquid hydrogen, is heated to a high temperature in a nuclear reactor, and then expands through a rocket nozzle to create thrust.
Which requires liquid hydrogen to be ejected out of a rocket nozzle.
An asymmetric Casimir sail Would not require any fuel to eject put a nozzle, so if one were feasible, it would be perfect for long distance, long duration space travel.