Control of superconducting qubits using a quantum-based Josephson Arbitrary Waveform Synthesizer

Scaling of quantum computers to fault-tolerant levels will rely critically on hardware efficiency, stability, and reproducibility of qubit control and readout electronics. These electronics will require low power consumption, efficient wiring, and stable amplitude and frequency control to maximize uptime and reduce system complexity. Satisfying these requirements using room-temperature (RT) microwave sources is difficult at only O(100) qubits. Integration of control/readout electronics at cryogenic temperatures offers an attractive solution to these challenges and benefits from reduced latency feedback via proximity with the quantum hardware. Here, we use a Josephson Arbitrary Waveform Synthesizer (JAWS) at the 3 K stage of a dilution refrigerator as a direct replacement for a RT synthesizer to control a 0.01 K transmon qubit. JAWS signal generation at 3 K mitigates quasiparticle poisoning observed in a previous attempt to co-locate Josephson control circuits and qubits. Furthermore, the JAWS output is intrinsically self-calibrated, highly reproducible, and insensitive to ambient fluctuations. This talk offers a first direct comparison of single-qubit operations using JAWS and RT waveform synthesis, demonstrating an avenue toward scalability via JAWS-based qubit control.