Cryogenic operation of SOI electron pumps and ring oscillators

Recent breakthroughs in silicon spin quantum bits motivate the effort to develop a whole set of conventional CMOS circuits to provide a low-noise, dedicated interface with the qubits, operating at low temperature. In this spirit we have developed a ring-oscillator based circuit designed to generate RF signals on chip, as well as new electron pumps fabricated using only optical lithography, thus making them compatible with massively parallel fabrication with high yield. Design, cryogenic operation and performances are discussed.