Ms. Saleha Fatema Profile

Saleha Fatema

at Purdue University

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Proceedings Article | 10 June 2024 Presentation

Broadband polarization-entangled photon pairs from a bidirectionally pumped silicon microring resonator

Alexander Miloshevsky, Karthik Myilswamy, Lucas Cohen, Hsuan-Hao Lu, Saleha Fatema, Muneer Alshowkan, Andrew Weiner, Joseph Lukens

Proceedings Volume PC13028, PC130280C (2024) https://doi.org/10.1117/12.3020187

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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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