  It has proven difficult to distinguish between topological Majorana bound
states and nontopological Andreev bound states and to measure the unique
properties of the former. In this work, we aim to alleviate this problem by
proposing and theoretically analyzing a new type of fusion protocol based on
transport measurements in a Majorana box coupled to normal leads. The protocol
is based on switching between different nanowire pairs being tunnel coupled to
one of the leads. For a Majorana system, this leads to switching between
different states associated with parity blockade. The charge being transmitted
at each switch provides a measurement of the Majorana fusion rules.
Importantly, the result is different for a system with nontopological Andreev
bound states. The proposed protocol only requires measuring a DC current
combined with fast gate-control of the tunnel couplings.

Mesoscale and Nanoscale Physics;Superconductivity;Quantum Physics