Scalable microwave modulation at cryogenic temperatures for qubit control using high-kinetic-inductance superconductors.*

Most quantum computing architectures rely on microwave pulses to manipulate qubits. However, when scaling systems to large numbers of qubits, delivering vector-modulated microwave signals to cryogenic environments can be challenging, especially in dilution refrigerators where cooling power is limited to microwatts. On-chip generation of qubit control signals can help reduce cabling requirements and promote scalability. High-kinetic-inductance superconducting materials, owing to their low loss and tunable inductance, enable on-chip modulation of microwave signals in dilution refrigerators. Here, we report on continued efforts to develop a multi-channel cryogenic qubit control architecture that can address multiple qubits while utilizing only a single local oscillator. Alternative approaches will also be discussed.

[1] Annunziata et al., Nanotechnology 21, 445202(2010)

[2] Jonas Zmuidzinas, Annual Review of Condensed Matter Physics 3, 169 (2012)