Alice & Bob Decodes LDPC-Cat Codes on GPUs With NVIDIA NVQLink

Insider Link Alice & Bob demonstrated GPU decoding of its LDPC-cat error-correction codes using NVIDIA NVQLink and synthetic data, a step toward scalable error correction for cat-qubit quantum computers.

The demonstration did not achieve real-time decoding, and Alice & Bob plans to optimize data transfer and processing to keep pace with its quantum computers.

PRESS RELEASE — Alice & Bob, a leader in fault-tolerant quantum computing, today shared results from implementing GPUs to decode its LDPC-cat architecture using NVIDIA NVQLink.

LDPC-cat codes were developed by Alice & Bob for its cat-qubit architecture and first introduced in the paper “LDPC-cat codes for low-overhead quantum computing in 2D” published in January 2025.

Showing that our LDPC-cat codes can be decoded on NVIDIA GPUs with existing tools is encouraging for scaling, because it means decoding capacity can grow with the machine.