Phys.org August 24, 2024
The distribution of high-fidelity high-rate entanglement over telecommunication infrastructure is one of the main paths toward large-scale quantum networks, enabling applications such as quantum encryption and network protection, blind quantum computing, distributed quantum computing, and distributed quantum sensing. However, the fragile nature of entangled photons operating in real-world fiber infrastructure has historically limited continuous operation of such networks. A company in New York presented a fully automated system capable of distributing polarization-entangled photons over a 34-km deployed fiber in New York City, achieving high rates of nearly 5×105 pairs/s. They demonstrated high fidelity of approximately 99% for rates up to 2×104 pairs/s. They also achieved 15 days of continuous distribution, with a network up-time of 99.84%. According to the researchers their work paves the way for practical deployment of always-on entanglement-based networks with rates and fidelity adequate for many current and future use cases… read more. Open Access TECHNICAL ARTICLEÂ
The experimental setup for entanglement-distribution experiments. The background shows the path of the GothamQ fibers. Credit: PRX Quantum 5, 030330, 9 August 2024