Quantum communications are making significant strides, with recent breakthroughs demonstrating the potential for ultra-secure data transmission over existing infrastructure. In April 2025, scientists at Toshiba Europe successfully transmitted quantum-encrypted messages over a 254-kilometer German commercial telecom network. Utilizing quantum key distribution (QKD), which leverages quantum entanglement, the researchers achieved secure message exchange via standard optical fibers without requiring expensive cryogenic equipment. This experiment is notable for its practicality and scalability, distinguishing it from earlier quantum communication projects that depended on specialized or satellite systems. The findings suggest a promising future for integrating simplified quantum technologies into existing infrastructure, paving the way for widespread national and international deployment of quantum-secure networks. ft.com
Similarly, in May 2025, researchers at the University of Rochester and Rochester Institute of Technology connected their campuses with an experimental quantum communications network using two optical fibers. The Rochester Quantum Network (RoQNET) employs single photons to transmit information over 11 miles along fiber-optic lines at room temperature using optical wavelengths. This approach eliminates the need for bulky and expensive superconducting-nanowire-single-photon-detectors, making quantum communication more accessible and cost-effective. The researchers aim to connect RoQNET to other research facilities across New York State, demonstrating the feasibility of integrating quantum communication into existing fiber-optic infrastructure. sciencedaily.com