Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication

Understand

Quantum computing architectures rely on classical electronics for control and readout.

• Employing classical electronics in a feedback loop with the quantum system allows to stabilize states, correct errors and to realize specific feedforward-based quantum computing and communication schemes such as deterministic quantum teleportation.
• These feedback and feedforward operations are required to be fast compared to the coherence time of the quantum system to minimize the probability of errors.
• We present a field programmable gate array (FPGA) based digital signal processing system capable of real-time quadrature demodulation, determination of the qubit state and generation of state-dependent feedback trigger signals.