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Qubits are the basic building blocks of a quantum processor which requireelectromagnetic pulses in giga hertz frequency range and latency in nanosecondsfor control and readout. In this paper, we address three main challengesassociated with room temperature electronics used for controlling and measuringsuperconducting qubits: scalability, direct microwave synthesis, and a unifieduser interface. To tackle these challenges, we have developed SQ-CARS, a systembased on the ZCU111 evaluation kit. SQ-CARS is designed to be scalable,configurable, and phase synchronized, providing multi-qubit control and readoutcapabilities. The system offers an interactive Python framework, making ituser-friendly. Scalability to a larger number of qubits is achieved bydeterministic synchronization of multiple channels. The system supports directsynthesis of arbitrary vector microwave pulses using the second-Nyquist zonetechnique, from 4 to 9 GHz. It also features on-board data processing liketunable low pass filters and configurable rotation blocks, enabling lock-indetection and low-latency active feedback for quantum experiments. All controland readout features are accessible through an on-board Python framework. Tovalidate the performance of SQ-CARS, we conducted various time-domainmeasurements to characterize a superconducting transmon qubit. Our results werecompared against traditional setups commonly used in similar experiments. Withdeterministic synchronisation of control and readout channels, and anopen-source approach for programming, SQ-CARS paves the way for advancedexperiments with superconducting qubits.

SQ-CARS: A Scalable Quantum Control and Readout System