very cool, now how does it work...
not even a hint
We may find out in June. Maybe even later. I assume it will have a very small thrust, and so it may take some time to see if it's even moving to any appreciable degree.
not even a hint
I believe there is a hint. It's in the name "quantum" drive.
Some years back, there was a proposal to utilize the effect of virtual particles spontaneously popping into existence to act as propellant. When a particle popped into existence, it would be accelerated by an electric field before it disappeared again, thereby imparting a reaction force to the "engine."