Sensitive radiofrequency readout of quantum dots using an ultra-low-noise SQUID amplifier
Sensitive radiofrequency readout of quantum dots using an ultra-low-noise SQUID amplifier
Fault-tolerant spin-based quantum computers will require fast and accurate qubit readout. This can be achieved using radio-frequency reflectometry given sufficient sensitivity to the change in quantum capacitance associated with the qubit states. Here, we demonstrate a 23-fold improvement in capacitance sensitivity by supplementing a cryogenic semiconductor amplifier with a SQUID …