Bosonic quantum Fourier codes

Anthony Leverrier · 2026 · Quantum 10, 2000

| 编号 QCV030 | 主题 连续变量与玻色子算术 | 链接 doi:10.22331/q-2026-02-09-2000 |

摘要

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While 2-level systems, aka qubits, are a natural choice to perform a logical quantum computation, the situation is less clear at the physical level. Encoding information in higher-dimensional physical systems can indeed provide a first level of redundancy and error correction that simplifies the overall fault-tolerant architecture. A challenge then is to ensure universal control over the encoded qubits. Here, we explore an approach where information is encoded in an irreducible representation of a finite subgroup of $U(2)$ through an inverse quantum Fourier transform. We illustrate this idea by applying it to the real Pauli group $⟨X,Z⟩$ in the bosonic setting. The resulting two-mode Fourier cat code displays good error correction properties and admits an experimentally-friendly universal gate set that we discuss in detail.

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