The EmDrive, originally developed by Roger Shawyer at SPR Ltd., is a propellant-free microwave thruster that produces acceleration via an electromagnetic cavity without need for traditional fuel sources. After several successful experimental demonstrations of the EmDrive’s ability to produce thrust by NASA’s Eagleworks laboratory, several researchers are using the quantum mechanical model of Pilot Wave theory to describe how the engine interacts with the quantum vacuum to produce thrust.

Article: http://www.forbes.com/sites/briankoberlein/2016/11/28/nasas-emdrive-and-the-quantum-theory-of-pilot-waves/#7cca47091721

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