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Quantum key distribution (QKD) has matured rapidly towards practical use for protecting fiber communication infrastructures due to its unique ability of transmitting information-theoretically secure digital keys. Here, we report key advances in QKD that allow modulator-free transmitter [1], application into existing fiber infrastructures [2,3] and cryogen-free long-distance operation [4].
We report stable operation of a multi-user Quantum Access Network over more than 24 hours. We connect multiple quantum transmitters to a single quantum receiver by pre-compensating all phase and polarisation fluctuations.
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