Error-detectable Universal Control for High-Gain Bosonic Quantum Error Correction
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866915761220485120 |
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| author | Cai, Weizhou Chen, Zi-Jie Li, Ming Jie, Qing-Xuan Zou, Xu-Bo Guo, Guang-Can Sun, Luyan Zou, Chang-Ling |
| author_facet | Cai, Weizhou Chen, Zi-Jie Li, Ming Jie, Qing-Xuan Zou, Xu-Bo Guo, Guang-Can Sun, Luyan Zou, Chang-Ling |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_21838 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Error-detectable Universal Control for High-Gain Bosonic Quantum Error Correction Cai, Weizhou Chen, Zi-Jie Li, Ming Jie, Qing-Xuan Zou, Xu-Bo Guo, Guang-Can Sun, Luyan Zou, Chang-Ling Quantum Physics 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. |
| title | Error-detectable Universal Control for High-Gain Bosonic Quantum Error Correction |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.21838 |