# Alice & Bob decodes cat-qubit error-correction codes on Nvidia GPUs, but not yet in real time

Canonical page: https://technooptimist.io/stories/alice-and-bob-decodes-cat-qubit-error-correction-codes-on-nvidia-gpus-704a3bae
Date: 13 Oct 2026
About: [Alice & Bob](https://technooptimist.io/companies/alice-and-bob.md) · [Cat-qubit roadmap](https://technooptimist.io/quantum/cat-qubits.md)
Original source: https://thequantuminsider.com/2026/10/13/alice-bob-decodes-ldpc-cat-codes-on-gpus-with-nvidia-nvqlink/

Alice & Bob has shown that its LDPC-cat error-correction codes can be decoded on Nvidia GPUs, linking Quantum Machines control hardware to the GPUs through Nvidia's NVQLink. The result is a proof of concept on synthetic data, and the decoding was not fast enough for real-time use.

## Key facts

- The setup connects Quantum Machines' OPX1000 control hardware to GPUs through NVQLink and the Open Acceleration Stack.
- The test used synthetic data, not measurements from a physical quantum processor.
- Decoding became more efficient when several error syndromes were processed in parallel; no latency or throughput numbers are given.
- Real-time decoding was not reached; the next step is tuning the data path from measurement hardware to the GPU, with Nvidia.

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