Experimental demonstration of continuous quantum error correction

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