发表机构
Russian Quantum Center; Moscow Institute of Physics and Technology; Department of Physics, M.V.Lomonosov Moscow State University（俄罗斯量子中心; 莫斯科物理技术学院; 莫斯科国立大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文从理论和实验上研究0型和II型OPA产生的多模压缩光，利用脉冲整形技术表征压缩度对LO光谱轮廓的依赖，采用施密特模理论分析，对多模量子协议实现有重要影响。
AI 中文摘要
如今，基于连续变量的量子计算和量子通信的实现因其系统维度的显著扩展而受到广泛关注。该领域的主要进展归功于基于光压缩态的多模系统的实现。产生此类态的最简单方法之一是利用超快泵浦在单次通过光学参量放大器（OPA）中产生。然而，对于此类多模态的零差探测，本地振荡器（LO）的轮廓必须与所测模式的轮廓完美匹配。通常情况并非如此，因此需要对多模压缩进行适当处理。在本工作中，我们从理论和实验两方面研究了在0型及II型OPA中产生的多模压缩光。我们表征了此类光源，并利用脉冲整形技术研究了压缩度对LO光谱轮廓的依赖关系。理论分析采用施密特模理论进行。这项工作可能对多模量子协议的实现产生重要影响。
英文摘要
Nowadays, the realization of quantum computations and communications based on continuous variables has attracted a significant attention due to a substantial expansion of the system dimensionality. The main progress in this area is attributed to the implementation of multimode systems based on squeezed states of light. One of the simplest ways to generate such states relies upon their producing in a single-pass optical parametric amplifier (OPA) using ultrafast pumping. However, for homodyne detection of such multimode states, the profile of the local oscillator (LO) must perfectly match the profile of the measured mode. Usually, this is not the case; therefore a proper treatment of multimode squeezing is required. In this work, we study both theoretically and experimentally the multimode squeezed light generated in type-0 and type-II OPA. We characterize such sources and investigate the degree of squeezing in dependence on the LO spectral profile, employing a pulse shaping technique. The theoretical analysis is performed using the Schmidt-mode theory. This work might have a significant impact on the realization of multimode quantum protocols
