To create a Trojan electron, researchers would first use laser light to put the electron into a "circular Rydberg state" in which the electron exists in a thin donut of possible positions (b). Then, a microwave beam would subsequently change the shape of the donut (c-e), shrinking the range of possible positions for the electron and ultimately causing the electron to shrink into a small droplet (or alternatively, a shortened sausage) of possible positions. This droplet then orbits the nucleus like a planet around the sun.
Although not yet achieved experimentally, researchers believe that current technology could be applied to create Trojan electrons. The figure is not to scale--the circular Rydberg and Trojan states are actually hundreds of thousands of times farther away from the nucleus. In addition, the figure essentially shows just the top half of the probability cloud for the Trojan electron.