Integrating Riverlane's Deltaflow QEC stack with Rigetti's QPU

Quantum error correction (QEC) is critical to unlock the full potential of quantum computers. Decoder feedback during circuit execution will be required for implementing logical conditional gates. This imposes demands on the QEC system's speed. First, the decoder throughput needs to be sufficiently fast to avoid the backlog problem. Second, the overall decoding response loop must be sufficiently low latency to avoid significantly slowing down the circuit execution time. Riverlane's Deltaflow QEC stack focuses on building a system that can address these challenges. Recently, Deltaflow has been integrated with Rigetti's Ankaa-3-36Q QPU, enabling real-time decoded experiments with streaming decoding, high decoding throughput and low latencies in the system. Integrating the QEC stack in the currently available devices helps control systems, QPUs and QEC systems to already identify design choices that will ensure compatibility with fault-tolerant quantum computers in the long run. Here, we explain the integration work as well as the learnings along the way.