Continuous Entanglement Distribution from an AlGaAs-on-Insulator Microcomb for Quantum Communications

• URL: http://arxiv.org/abs/2310.14112v1
• Date: Sat, 21 Oct 2023 20:32:11 GMT
• Title: Continuous Entanglement Distribution from an AlGaAs-on-Insulator Microcomb for Quantum Communications
• Authors: Trevor J. Steiner, Maximilian Shen, Joshua E. Castro, John E. Bowers, and Galan Moody
• Abstract summary: We report high-rate continuous entanglement distribution for two sets of entangled-photon pair frequency modes. As a proof of principle, a quantum key is distributed across 12 km of deployed fiber on the UCSB campus.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Using an aluminum gallium arsenide microring resonator, we demonstrate a bright quantum optical microcomb with $>300$ nm bandwidth and more than 20 sets of time-energy entangled modes, enabling spectral demultiplexing with simple, off-the-shelf commercial telecom components. We report high-rate continuous entanglement distribution for two sets of entangled-photon pair frequency modes exhibiting up to $20$ GHz/mW$^2$ pair generation rate. As an illustrative example of entanglement distribution, we perform a continuous-wave time-bin quantum key distribution protocol with 8 kbps raw key rates while maintaining less than 10$\%$ error rate and sufficient two-photon visibility to ensure security of the channel. When the $>$20 frequency modes are multiplexed, we estimate $>$100 kbps entanglement-based key rates or the creation of a multi-user quantum communications network. The entire system requires less than 110 $\mu$W of on-chip optical power, demonstrating an efficient source of entangled frequency modes for quantum communications. As a proof of principle, a quantum key is distributed across 12 km of deployed fiber on the UCSB campus and used to transmit a 21 kB image with $<9\%$ error.

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