We describe a CMOS photonic integrated circuit for fully on-chip generation of frequency-bin and polarization-
entangled photon pairs. The Sagnac-inspired design uses an on-chip polarization splitter-rotator to bidirectionally
pump a microring resonator and generate entangled photon pairs through spontaneous four-wave mixing in
frequency bins spaced 38.4 GHz apart with < 6 GHz linewidth. By recombining the counterpropagating outputs
into orthogonal polarization modes with a second polarization splitter-rotator, the source outputs polarization
Bell states with high fidelity (95% on average for ≥ 10 bins away from the pump) across the C- and L-bands
(> 9 THz)—a bandwidth currently limited only by the passband of our wavelength-selective switch. Our source
has applications in flex-grid entanglement distribution, where adjacent frequency bins may be combined to
improve the flux and coincidences received by an end-user. Additionally, the source can support a high density
of information per photon pair as a hyperentangled resource in the polarization and frequency-bin degrees of
freedom.
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