论文标题
通过相位压缩保护猫状态的量子干扰
Protecting the quantum interference of cat states by phase-space compression
论文作者
论文摘要
CAT状态具有其独特的相空间干扰性能，是了解量子力学基本原理并执行关键量子信息处理任务的理想候选者。但是，它们非常容易受到光子损失的影响，这不可避免地会减少其量子非高斯特征。在这里，我们通过压缩猫状态的相空间分布来保护这些非高斯的特征免受光子损失。我们通过基于回声QED设备中的回声条件位移操作来实现这种压缩技术。我们提出了一种多功能技术，用于在高度线性的波音模式下创建强大的非高斯连续可变资源状态，并操纵其相空间分布以实现对光子损失的增强弹性。压缩猫状态为获得量子基础和量子计量学的新见解提供了一个有吸引力的途径，并为固有保护的骨骼代码字开发以进行量子误差校正。
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.
