Core Insights - Danish and Czech scientists have successfully achieved a transmission distance of 120 kilometers for quantum signals and classical data using Continuous Variable Quantum Key Distribution (CV-QKD) technology [1][2] - The research highlights the potential of CV-QKD to provide a plug-and-play quantum security solution for long-distance fiber links without the need for additional filtering equipment or specific wavelength allocation [2] Group 1: Technology Overview - Quantum Key Distribution (QKD) leverages quantum mechanics to enable highly secure information transmission, where any eavesdropping attempt disturbs the quantum state of the transmitted information, alerting the communicating parties [1] - Traditional QKD deployment faces challenges due to noise introduced by classical channels, limiting transmission distances to a few dozen kilometers [1] Group 2: Research Breakthrough - The study successfully mitigated interference between quantum signals and classical data by activating the long-ignored "built-in filtering" feature of the CV-QKD system, optimizing the quantum signal transmission strategy [2] - This advancement allows for stable and reliable quantum key distribution over a 120-kilometer fiber carrying full classical data, significantly reducing the difficulty of upgrading existing networks [2] Group 3: Future Prospects - The research team suggests that improvements in error correction technology could further enhance transmission distances and key generation efficiency in the future [2]