Efficient Concatenated Bosonic Code for Additive Gaussian Noise

Understand

Bosonic codes offer noise resilience for quantum information processing.

• Good performance often comes at a price of complex decoding schemes, limiting their practicality.
• Here, we propose using a Gottesman-Kitaev-Preskill (GKP) code to detect and discard error-prone qubits, concatenated with a quantum parity code to handle the residual errors.
• Our method employs a simple, linear-time decoder that nevertheless offers significant performance improvements over the standard decoder.