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Quantum networks require the reliable encoding of quantum information in narrow-band single photons which couple efficiently to transitions in atomic ensembles. We show time-bin encoding for photons of 10 MHz width via unbalanced Michelson interferometers and show the applicability of our scheme in a quantum key distribution experiment.
We demonstrate a fully functioning and portable QKD system based on polarisation entanglement for long time usage. We further show the distribution of secure keys a rate of 1 kbit/s over 25 km for 24 hours.
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