Low overhead fault-tolerant quantum error correction with the surface-GKP code
Kyungjoo Noh · Christopher Chamberland · Fernando G. S. L. Brandão · 2022 · PRX Quantum 3, 010315
| 编号 QCV007 | 主题 连续变量与玻色子算术 | 链接 arXiv:2103.06994 |
摘要
摘要保留原文（英文）
摘要取自 arXiv / 出版方元数据，未作翻译，以保证与原文一致。
Fault-tolerant quantum error correction is essential for implementing quantum algorithms of significant practical importance. In this work, we propose a highly effective use of the surface-GKP code, i.e., the surface code consisting of bosonic GKP qubits instead of bare two-dimensional qubits. In our proposal, we use error-corrected two-qubit gates between GKP qubits and introduce a maximum likelihood decoding strategy for correcting shift errors in the two-GKP-qubit gates. Our proposed decoding reduces the total CNOT failure rate of the GKP qubits, e.g., from to at a GKP squeezing of dB, compared to the case where the simple closest-integer decoding is used. Then, by concatenating the GKP code with the surface code, we find that the threshold GKP squeezing is given by dB under the assumption that finite-squeezing of the GKP states is the dominant noise source. More importantly, we show that a low logical failure rate can be achieved with moderate hardware requirements, e.g., modes and qubits at a GKP squeezing of dB as opposed to bare qubits for the standard rotated surface code at an equivalent noise level (i.e., ). Such a low failure rate of our surface-GKP code is possible through the use of space-time correlated edges in the matching graphs of the surface code decoder. Further, all edge weights in the matching graphs are computed dynamically based on analog information from the GKP error correction using the full history of all syndrome measurement rounds. We also show that a highly-squeezed GKP state of GKP squeezing dB can be experimentally realized by using a dissipative stabilization method, namely, the Big-small-Big method, with fairly conservative experimental parameters. Lastly, we introduce a three-level ancilla scheme to mitigate ancilla decay errors during a GKP state preparation.
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