Integrated quantum photonics is a key tool towards large scale quantum technologies. In this work we present an AlGaAs-based photonic circuit for on-chip generation and manipulation of broadband polarization-entangled photon pairs. The quantum state is generated by Type-II spontaneous parametric down conversion in AlGaAs Bragg reflection waveguides at telecom wavelengths and room temperature. Polarization entangled photons are manipulated over a frequency band of around 50 nm by an integrated polarizing beam splitter. We demonstrate Hong-Ou-Mandel visibility of 80% for a quantum device where the photon pairs generation and manipulation are implemented in a single chip.
In this work, we combine an on-chip, telecom, broadband polarization-entangled photon
source with industry-grade flexible wavelength management techniques to build a reconfigurable entanglement distribution quantum network over up to 75 km between up to 8 users.
As an application, we implement a multi-user QKD protocol (BBM92) over our network.
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