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Quantum photonic technologies, such as quantum key distribution, are alreadybenefiting greatly from the rise of integrated photonics. However, theflexibility in design of these systems is often restricted by the properties ofthe integration material platforms. Here, we overcome this choice by usinghybrid integration of ultra-low-loss silicon nitride waveguides with indiumphosphide electro-optic modulators to produce high-performance quantum keydistribution transceiver chips. Access to the best properties of both materialsallows us to achieve active encoding and decoding of photonic qubits on-chip atGHz speeds and with sub-1% quantum bit error rates over long fibre distances.We demonstrate bidirectional secure bit rates of 1.82 Mbps over 10 dB channelattenuation and positive secure key rates out to 250 km of fibre. The resultssupport the imminent utility of hybrid integration for quantum photoniccircuits and the wider field of photonics.

A Hybrid Integrated Quantum Key Distribution Transceiver Chip