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Reflection Properties of Fluxon in a Josephson Transmission Line

Direct observation is reported of fluxon reflections in a Josephson transmission line (JTL) using a Josephson sampler. It is found that a single fluxon, an antifluxon, and multi-antifluxons are reflected depending on the bias current at the end of the JTL. The observed reflection properties, including the interaction between reflected antifluxons, can be satisfactorily explained by numerical simulations taking account of the nonlinear shunting loss and the surface loss.