A prerequisite for universal quantum computation and other large-scale quantum information processors is the careful preparation of quantum states in massive numbers or of massive dimension. For continuous variable approaches to quantum information processing (QIP), squeezed states are the natural quantum resources, but most demonstrations have been based on a limited number of squeezed states due to the experimental complexity in up-scaling. The number of physical resources can however be significantly reduced by employing the technique of temporal multiplexing. Here, we demonstrate an application to continuous variable QIP of temporal multiplexing in fiber: Using just a single source of squeezed states in combination with active optical switching and a 200 m fiber delay line, we generate fiber-coupled Einstein-Podolsky-Rosen entangled quantum states. Our demonstration is a critical enabler for the construction of an in-fiber, all-purpose quantum information processor based on a single or few squeezed state quantum resources.

通用量子计算和其他大规模量子信息处理器的先决条件是精心准备大量或大规模的量子态。对于量子信息处理（QIP）的连续变量方法，压缩状态是自然的量子资源，但是由于放大过程中的实验复杂性，大多数演示都基于有限数量的压缩状态。但是，通过采用时间复用技术，可以显着减少物理资源的数量。在这里，我们演示了在光纤中进行时间复用的连续变量QIP的应用：仅使用压缩状态的单个源结合有源光开关和200 m光纤延迟线，我们产生了纤维耦合的爱因斯坦-波多尔斯基-罗森纠缠的量子态。我们的演示是构建基于单个或少量压缩状态量子资源的光纤通用量子信息处理器的关键推动力。