The Qubit Readout Module (QRM) is a massively scalable readout module that elevates measurements on various qubit platforms. It replaces conventional pulse generators, digitizers, and readout analyzers by combining 2 inputs and 2 outputs to execute reflectometry, transmission, photon counting, and spectroscopy experiments in a single module. Equipped with two analog outputs, two analog inputs, and four digital outputs, the QRM embodies the scalable philosophy of the Qblox Cluster. Its six Q1 sequence processors provide flexible and multiplexed signals to any output, facilitating rapid measurement analysis. Up to 120 processor cores can be integrated in a single 19” mainframe with all-to-all connectivity within ∼350 ns for efficient distribution of measurement outcomes for crucial quantum error correction algorithms.

The QRM generates readout pulses on the fly with real-time pulse parametrization, and the input signals are processed onboard to enhance efficiency in spectroscopy, transmission, and reflectometry measurements. The module’s excellent analog performance provides a low input noise floor, a broad input range (0.1 to 2 Vpp), and a 1 GSPS sampling rate. Each component has been meticulously selected and designed to ensure an extremely low offset and gain drift (<5 ppm/K). Supported by our SYNQ and LINQ protocols, QRM modules are the ideal readout instruments in the baseband regime as multi-purpose measurement equipment for various readout schemes.