In a recent article, Harald Havir et al. present a method for rapid and efficient detection of electrical charge in quantum systems using a nonlinear resonator that amplifies the signal without matching the sensor’s dissipation conditions. Thereby, they overcome previous limitations and make it applicable to various oscillating systems.
Fast and reliable detection is essential for probing quantum systems before fragile information is lost. In a new study, the researchers show that a nonlinear resonator can deliver a near-perfect readout signal without meeting the usual impedance-matching requirements that normally limit detector speed. By deliberately driving the resonator into a nonlinear regime, they found a way to boost the signal that opens the door to much faster charge detection in quantum devices.
“The goal is to detect the presence of an electric charge in a quantum system”, says Harald Havir, who defended his PhD thesis last year.
“The challenge with doing this is to perform the readout fast, so that the information carried by the electron isn’t lost in time. The quicker the better, so to speak.”
