分布式纠缠生成相干反馈方案的局部最优性：理想化的无限带宽极限
Local optimality of a coherent feedback scheme for distributed entanglement generation: the idealized infinite bandwidth limit
AI总结：
本文证明了在理想无限带宽极限下，一种新型相干反馈配置在分布式EPR纠缠生成中的局部最优性，通过非退化光学参量放大器实现，为有限带宽场景提供准确近似。
摘要：
本文旨在证明一种近期提出的相干反馈配置在理想化无限带宽极限下，用于分布式EPR纠缠生成的局部最优性。该局部最优性针对一类相似的相干反馈配置，但采用不同的酉散射矩阵，代表网络中信号传播的不同散射特性。无限带宽极限显著简化了分析，使局部最优性准则可以显式验证。尽管如此，这一极限对于有限带宽场景也是相关的，因为它在低频区域提供了EPR纠缠的准确近似。
英文摘要：
The purpose of this paper is to prove a local optimality property of a recently proposed coherent feedback configuration for distributed generation of EPR entanglement using two nondegenerate optical parametric amplifiers (NOPAs) in the idealized infinite bandwidth limit. This local optimality is with respect to a class of similar coherent feedback configurations but employing different unitary scattering matrices, representing different scattering of propagating signals within the network. The infinite bandwidth limit is considered as it significantly simplifies the analysis, allowing local optimality criteria to be explicitly verified. Nonetheless, this limit is relevant for the finite bandwidth scenario as it provides an accurate approximation to the EPR entanglement in the low frequency region where EPR entanglement exists.
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