A photonic link in which a high-speed extended-InGaAs photodiode, operated at cryogenic temperatures and illuminated by short optical pulses, converts optical signals into shaped microwave pulses for driving and reading out superconducting qubits. Extending the InGaAs absorption edge restores responsivity at 1550 nm at millikelvin temperatures, short-pulse detection reaches a shot-noise-limited signal-to-noise ratio better than modulated continuous-wave detection, and multi-frequency pulse generation opens a route to multiplexing many qubit control channels over one fiber.
This NIST-led paper investigates short-pulse illumination of a high-speed extended-InGaAs photodiode operated at cryogenic temperatures, aimed at optically driving and reading out superconducting qub…