  Generating entangled photons from a monolithic chip is a major milestone
towards real-life applications of optical quantum information processing
including quantum key distribution and quantum computing. Ultrabroadband
entangled photons are of particular interest to various applications such as
quantum metrology and multi-party entanglement distribution. In this work, we
demonstrate the direct generation of broadband wavelength multiplexed
polarization entangled photons from a semiconductor chip for the first time.
Without the use of any on-chip compensation, interferometry, entangled photons
with a signal-idler separation as large as 95 nm in the telecom band were
observed. The highest concurrence of 0.98$\pm$0.01 achieved in this work is
also the highest, to the best of our knowledge, comparing to all previously
demonstrated semiconductor waveguide sources. This work paves the way for fully
integrated, ultrabroadband sources of polarization entangled photons.
