Cryo-CMOS Dual-Qubit Homodyne Reflectometer Array With Degenerate Parametric Amp

Abstract

In quantum computers, the quantum state discrim- ination of the physical quantum bits (Qubits) occupies ∼80% of the quantum error correction (QEC) cycle. The RF reflectometry or dispersive readout determines the Qubit state by monitoring the RF reflection of the attached high- Q resonant tank. Com- pared to their dc counterparts, the RF reflectometers enjoy a high signal-to-noise ratio (SNR), low drifting, and fast speed. As a result, a high-fidelity, single-shot, scalable reflectometer array ba