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It has proven difficult to distinguish between topological Majorana boundstates and nontopological Andreev bound states and to measure the uniqueproperties of the former. In this work, we aim to alleviate this problem byproposing and theoretically analyzing a new type of fusion protocol based ontransport measurements in a Majorana box coupled to normal leads. The protocolis based on switching between different nanowire pairs being tunnel coupled toone of the leads. For a Majorana system, this leads to switching betweendifferent states associated with parity blockade. The charge being transmittedat each switch provides a measurement of the Majorana fusion rules.Importantly, the result is different for a system with nontopological Andreevbound states. The proposed protocol only requires measuring a DC currentcombined with fast gate-control of the tunnel couplings.

Transport-based fusion that distinguishes between Majorana and Andreev bound states