arXiv 2212.012712022-12-02quant-ph

用相空间压缩法防止猫态的量子干涉

Protecting the quantum interference of cat states by phase-space compression

Xiaozhou Pan, Jonathan Schwinger, Ni-Ni Huang, Pengtao Song, Weipin Chua, Fumiya Hanamura, Atharv Joshi, Fernando Valadares, Radim Filip, Yvonne Y. Gao

备注：: 12 pages, 9 figures

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摘要：

猫态具有独特的相空间干涉特性，是理解量子力学基本原理和执行关键量子信息处理任务的理想候选者。然而，它们对光子损失非常敏感，这不可避免地减少了它们的量子非高斯特征。在这里，我们通过压缩猫态的相空间分布来保护这些非高斯特征免受光子损失。我们实现了这种压缩的确定性技术的基础上的回声条件位移操作的电路QED设备。我们提出了一种通用的技术，用于在高度线性玻色子模式中创建鲁棒的非高斯连续变量资源状态，并操纵其相空间分布，以实现增强的光子损失恢复能力。压缩猫态提供了一个有吸引力的途径，获得新的见解量子基础和量子精密测量，并为开发内在更多的保护玻色子码字的量子纠错。

英文摘要：

Cat states, with their unique phase-space interference properties, are ideal candidates for understanding fundamental principles of quantum mechanics and performing key quantum information processing tasks. However, they are highly susceptible to photon loss, which inevitably diminishes their quantum non-Gaussian features. Here, we protect these non-Gaussian features against photon loss by compressing the phase-space distribution of a cat state. We achieve this compression with a deterministic technique based on the echo conditional displacement operation in a circuit QED device. We present a versatile technique for creating robust non-Gaussian continuous-variable resource states in a highly linear bosonic mode and manipulating their phase-space distribution to achieve enhanced resilience against photon loss. Compressed cat states offer an attractive avenue for obtaining new insights into quantum foundations and quantum metrology, and for developing inherently more protected bosonic codewords for quantum error correction.

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