Stanislas PASTOR

Solid-state circuits operating at cryogenic temperature are on the critical path to address the challenges related to quantum computing applications. Indeed, to perform operations on quantum bits (qubits) like control and read out require classical electronic controllers. As soon as quantum processors become more complex, classical electronic control approaches, requiring multiple RF and DC cables per qubit and each of them connected to room-temperature instruments, are no longer a sustainable way. A promising approach consists in considering the integration of read-out and control circuitry in standard CMOS technologies operating at cryogenic temperatures. In such a way, significant form factor is reachable, enabling more qubit control complexity while limiting power consumption and being a cost-effective solution.
Qubits control and read-out require the generation and acquisition of specific RF signals, leading to the need of several RF blocks that could be assimilated as wireless RF transceiver for which bandwidth, gain, RF noise and linearity have to be optimized at cryogenic temperature. As an example, typical RF blocks will be parametric amplifiers and low noise amplifiers, RF oscillators. Such blocks will require active and passive devices with accurate modeling at cryogenic temperatures.