Error-detectable Universal Control for High-Gain Bosonic Quantum Error Correction

• URL: http://arxiv.org/abs/2601.21838v1
• Date: Thu, 29 Jan 2026 15:17:46 GMT
• Title: Error-detectable Universal Control for High-Gain Bosonic Quantum Error Correction
• Authors: Weizhou Cai, Zi-Jie Chen, Ming Li, Qing-Xuan Jie, Xu-Bo Zou, Guang-Can Guo, Luyan Sun, Chang-Ling Zou,
• Abstract summary: Current QEC-protected logical qubits have only achieved coherence times about twice those of their best physical constituents.<n>We introduce error-detectable universal control of bosonic modes, wherein ancilla relaxation events are detected and the corresponding trajectories discarded.<n>For binomial codes, we demonstrate universal gates with fidelities exceeding $99.6%$ and QEC gains of $8.33times$ beyond break-even.
• Score: 5.756531283468077
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Protecting quantum information through quantum error correction (QEC) is a cornerstone of future fault-tolerant quantum computation. However, current QEC-protected logical qubits have only achieved coherence times about twice those of their best physical constituents. Here, we show that the primary barrier to higher QEC gains is ancilla-induced operational errors rather than intrinsic cavity coherence. To overcome this bottleneck, we introduce error-detectable universal control of bosonic modes, wherein ancilla relaxation events are detected and the corresponding trajectories discarded, thereby suppressing operational errors on logical qubits. For binomial codes, we demonstrate universal gates with fidelities exceeding $99.6\%$ and QEC gains of $8.33\times$ beyond break-even. Our results establish that gains beyond $10\times$ are achievable with state-of-the-art devices, establishing a path toward fault-tolerant bosonic quantum computing.

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