利用微结构光纤本地振荡器光谱展宽进行压缩测量

中文摘要 AI 辅助

近年来，连续变量（CV）量子计算，即利用压缩态的量子计算，引起了广泛关注，因为它能够增加系统的维度。在连续变量协议中，零差探测在实现所需的门和操作中起着关键作用。通过参量下转换（PDC）产生的多模压缩光受益于宽带带宽，该带宽包含多个频率模式。然而，其宽带结构同时要求本地振荡器（LO）与压缩光模式精确匹配，以便进行正确的零差探测和处理。实现这种匹配通常是一项具有挑战性的任务，因为本地振荡器的光谱带宽通常显著窄于压缩光模式的带宽。在这项工作中，我们提出并实验演示了一种通过让本地振荡器通过微结构光纤来扩展其带宽的技术。我们通过在0型和II型参量下转换产生的多模压缩光的模式中测量压缩来验证所提出的概念。我们表明，展宽的本地振荡器开始与通过II型参量下转换产生的模式在光谱上匹配。所提出的技术可能有益于实现各种连续变量系统和协议。

英文摘要

Recently, continuous variables (CV) quantum computing, i. e. computing employing squeezed states, has attracted significant attention, as it enables to increase the dimensionality of the system. In CV protocols, homodyne detection plays a key role in the realization of the required gates and operations. Multimode squeezed light generated via parametric down-conversion (PDC) benefits from the broadband bandwidth, which encompasses multiple frequency modes. However, its broadband structure simultaneously requires the precise matching of the local oscillator (LO) with the squeezed light modes for their correct homodyne detection and processing. Achieving such matching is usually a challenging task, since the spectral bandwidth of the local oscillator is typically significantly narrower than the bandwidth of the squeezed-light modes. In this work, we propose and experimentally demonstrate a technique for expanding the bandwidth of the LO by passing it through the microstructured fiber. We validate the proposed concept by measuring squeezing in the modes of multimode squeezed light generated in type-0 and type-II PDC. We show that the broadened LO starts to spectrally match the modes generated via type-II PDC. The presented technique might be beneficial for implementing various CV systems and protocols.

发表机构

• Russian Quantum Center（俄罗斯量子中心）
• Moscow Institute of Physics and Technology（莫斯科物理技术学院）
• M.V.Lomonosov Moscow State University（莫斯科国立大学）
• Dianov Fiber Optics Research Center（季阿诺夫光纤研究中心）

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