Interference of weak coherent states achieved with 91.8% visibility in a Sagnac interferometer fiber setup, indicating advances in quantum key distribution.
We demonstrate interference of weak coherent states with a visibility of up to 91.8% in a Sagnac interferometer over 219.4 km of deployed fiber, pointing to practical deployment of multi-user twin-field quantum key distribution.
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Clason et al. (2025) studied this question.
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