无消相干Schroedinger-Cat结构中参量放大多光子纯态的量子叠加
Quantum Superposition of Parametrically Amplified Multiphoton Pure States whitin a Decoherence-Free Schroedinger-Cat Structure
摘要：
采用量子注入纠缠态光参量放大器的新方法，将参量下转换产生的光子对的量子纠缠和叠加特性放大到高维自旋1/2希尔伯特空间。的维格纳函数和字段的关联函数的结构显示了一个无消相干，多光子薛定谔猫行为的发射场，这在很大程度上是可检测的压缩真空噪声。此外，由于系统的纠缠特性，我们发现系统具有多粒子量子不可分性和Bell型非定域性。这些相关的量子特性分析了几个行波光学配置意味着不同的输入量子注入方案
英文摘要：
The new process of quantum-injection into an optical parametric amplifier operating in entangled configuration is adopted to amplify into a large dimensionality spin 1/2 Hilbert space the quantum entanglement and superposition properties of the photon-couples generated by parametric down-conversion. The structure of the Wigner function and of the field's correlation functions shows a decoherence-free, multiphoton Schroedinger-cat behaviour of the emitted field which is largely detectable against the squeezed-vacuum noise. Furthermore, owing to its entanglement character, the system is found to exhibit multi-particle quantum nonseparability and Bell-type nonlocality properties. These relevant quantum features are analyzed for several travelling-wave optical configurations implying different input quantum-injection schemes
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