Quantum information storage and processing are vulnerable to external noise, leading to computational errors. Quantum error correction (QEC) effectively mitigates these errors. This research demonstrates a resource-efficient continuous QEC method using direct parity measurements, eliminating the need for entangling gates and ancillary qubits. An FPGA controller actively corrects errors as detected, achieving up to 91% bit-flip detection efficiency and increasing the logical qubit relaxation time by a factor of 2.7. The results highlight resource-efficient stabilizer measurements in multi-qubit architectures and showcase the potential of continuous QEC in building fault-tolerant systems.

William P. Livingston, Machiel S. Blok, Emmanuel Flurin, Justin Dressel, Andrew N. Jordan, Irfan Siddiqi