Real-time Fast Feedback Experiment enabled by a Customized FPGA-Based Control System

A quantum control system is crucial for precise and reliable quantum computations. We developed a customized FPGA-based control system with the quantum control processor at its core. The control processor is implemented as a RISC-V Rocket Core extended with the Quantum Instructon Set Architecture (QUASAR) co-processor. QUASAR facilitates quantum program execution for high control operation speed and future scalability enabling real-time feedback experiments. We previously demonstrated our custom control system on a Xilinx FPGA that can be used for various quantum experiments with a superconducting quantum information processor. Here we show a mid-circuit measurement experiment that allows extending the qubit's lifetime through fast real-time feedback.