  One of the leading approaches to large-scale quantum information processing
(QIP) is the continuous-variable (CV) scheme based on time multiplexing (TM).
As a fundamental building block for this approach, quantum light sources to
sequentially produce time-multiplexed squeezed-light pulses are required;
however, conventional CV TM experiments have used fixed light sources that can
only output the squeezed pulses with the same squeezing levels and phases. We
here demonstrate a programmable time-multiplexed squeezed light source that can
generate sequential squeezed pulses with various squeezing levels and phases at
a time interval below 100 ns. The generation pattern can be arbitrarily chosen
by software without changing its hardware configuration. This is enabled by
using a waveguide optical parametric amplifier and modulating its continuous
pump light. Our light source will implement various large-scale CV QIP tasks.
