Quantum Breakthrough: Single Photons Transmitted Over 2.1km with 99.8% Fidelity
Scientists have achieved a major milestone in quantum networking. They've successfully transmitted single photons through optical fibres over 2.1 kilometres with an astonishing fidelity of 99.8%. This breakthrough, published in Nature, paves the way for practical, scalable quantum networks with provable security advantages.
At the heart of this achievement lies an optical frequency comb, which precisely controls and compares light frequencies at different nodes. This crucial component, along with techniques adapted from high-stability optical atomic clocks, enables the stable exchange of single-photon-level laser pulses over phase-stable fibre links.
The research team, led by Nicholas V. Nardelli and Dileep V. Reddy, demonstrated remarkably low timing jitter in their system. This is a crucial aspect for quantum communication, ensuring the precise synchronisation of quantum nodes over existing fibre infrastructure. The team's work represents a significant step towards building a practical and scalable quantum internet.
The team's success in transmitting single photons with such high fidelity over long distances using deployed optical fibres brings us closer to a real-world quantum internet. This breakthrough opens up new possibilities for secure communication and quantum computing, marking a significant advancement in the field of quantum networking.
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