基于Fluxonium的玻色子纠错
Bosonic Error Correction with Fluxonium
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- Massachusetts Institute of Technology（麻省理工学院）
- ETH Zürich（苏黎世联邦理工学院）
- Université de Sherbrooke（舍布鲁克大学）
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中文总结 AI 辅助
该研究在完全平面超导架构中，利用重fluxonium和片上螺旋谐振器实现了玻色子量子纠错，通过制备并稳定GKP态，将逻辑寿命延长1.59倍，首次展示了弱耦合fluxonium的谐振器控制。
中文摘要 AI 辅助
玻色子量子纠错（QEC）为实现容错量子计算提供了一条硬件高效的路径。然而，迄今为止，超导电路实现的玻色子编码均采用厘米级三维微波腔，并由固定频率的transmon量子比特控制，其逻辑寿命受限于transmon的比特翻转错误。在此，我们通过将重fluxonium（其$451 \pm 70~\mu\mathrm{s}$的比特翻转寿命超过了以往演示中任何控制量子比特）与片上阿基米德螺旋谐振器配对，在完全平面架构中实现了玻色子QEC，该谐振器的模体积比先前的三维腔小若干个数量级。我们制备了有限能量的Gottesman-Kitaev-Preskill（GKP）态，并使用快速fluxonium重置的无测量纠错对其进行稳定，将逻辑寿命延长了$1.59 \pm 0.05$倍。这些结果首次展示了使用弱耦合fluxonium进行谐振器控制，并由此首次在完全平面超导电路架构中实现了独立的玻色子QEC。
英文摘要
Bosonic quantum error correction (QEC) offers a hardware-efficient route to fault-tolerant quantum computing. To date, however, superconducting circuit implementations of bosonic codes have utilized centimeter-scale 3D microwave cavities controlled by fixed-frequency transmon qubits, with logical lifetimes limited by transmon bit-flip errors. Here, we realize bosonic QEC in a fully planar architecture by pairing a heavy fluxonium, whose $451 \pm 70~μ\mathrm{s}$ bit-flip lifetime exceeds that of any control qubit in previous demonstrations, with an on-chip Archimedean spiral resonator several orders of magnitude smaller in mode volume than prior 3D cavities. We prepare finite-energy Gottesman-Kitaev-Preskill (GKP) states and stabilize them using measurement-free error correction with rapid fluxonium reset, extending the logical lifetime by a factor of $1.59 \pm 0.05$. These results provide the first demonstration of resonator control using a weakly coupled fluxonium and, with it, the first realization of standalone bosonic QEC in a fully planar superconducting circuit architecture.
