  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.
