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Quantum Communication Over 600-km Fiber Brings Quantum Internet Closer

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CAMBRIDGE, England, June 10, 2021 — Toshiba’s Cambridge Research Laboratory demonstrated quantum communications over optical fibers exceeding 600 km in length. The work leverages a technique called dual-band stabilization, and it marks a significant advance in quantum-encrypted communication, particularly for the secure transfer of information between metropolitan areas. How to transmit quantum bits over long optical fibers is among the challenges in building a quantum internet; small changes in ambient conditions, such as fluctuations in temperature, cause the fibers to expand and contract. This scrambles the...Read full article

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