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One of the most intriguing manifestations of quantum zero-point fluctuationsare the van der Waals and Casimir forces, often associated with vacuumfluctuations of the electromagnetic field. Here we study generalizedfluctuation potentials acting on internal degrees of freedom of components inelectrical circuits. These electronic Casimir-like potentials are induced bythe zero-point current fluctuations of any general conductive circuit. Forrealistic examples of an electromechanical capacitor and a superconductingqubit, our results reveal the possibility of tunable forces between thecapacitor plates, or the level shifts of the qubit, respectively. Our analysissuggests an alternative route towards the exploration of Casimir-likefluctuation potentials, namely, by characterizing and measuring them as afunction of parameters of the environment. Such tunable potentials may beuseful for future nanoelectromechanical and quantum technologies.

Electronic zero-point fluctuation forces inside circuit components