近日，瑞典查尔莫斯理工大学的Timo Hillmann与日本冲绳科学技术大学院大学的Fernando Quijandría合作，成功实现了耗散稳定压缩猫量子比特的量子误差修正。相关成果已于2023年3月27日在国际学术期刊《物理评论A》上发表。
该研究提出并分析了一种耗散稳定的压缩猫量子比特的纠错性能。研究结果表明，相比于普通猫量子比特，适度的压缩可以显著降低比特翻转误差率，但相位翻转率不变。此外，研究发现压缩使门操作更快且更高保真度。
据介绍，噪声偏置量子比特是降低与量子纠错相关的硬件开销的有前途的途径。压缩猫编码是一种基于压缩相干态的相空间非局域编码，是一种具有指数误差偏置的（玻色）噪声偏置量子比特的例子。
附：英文原文
Title: Quantum error correction with dissipatively stabilized squeezed-cat qubits
Author: Timo Hillmann, Fernando Quijandría
Issue&Volume: 2023/03/27
Abstract: Noise-biased qubits are a promising route toward significantly reducing the hardware overhead associated with quantum error correction. The squeezed-cat code, a nonlocal encoding in phase space based on squeezed coherent states, is an example of a noise-biased (bosonic) qubit with exponential error bias. Here we propose and analyze the error correction performance of a dissipatively stabilized squeezed-cat qubit. We find that for moderate squeezing the bit-flip error rate gets significantly reduced in comparison with the ordinary cat qubit while leaving the phase-flip rate unchanged. Additionally, we find that the squeezing enables faster and higher-fidelity gates.
DOI: 10.1103/PhysRevA.107.032423
Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.032423
