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TT: Fachverband Tiefe Temperaturen
TT 10: Topology: Majorana Physics I
TT 10.3: Talk
Monday, March 18, 2024, 15:30–15:45, H 2053
Transport-based fusion that distinguishes between Majorana and Andreev bound states — •Maximilian Nitsch1, Rubén Seoane Souto1,2, Stephanie Matern1, and Martin Leijnse1 — 1Lund University, S-22100 Lund, Sweden — 2Materials Science Institute of Madrid, Spanish Research Council (CSIC), 28049 Madrid, Spain.
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.
Keywords: Majorana bound states; Quantum interference effects; Nanowires; Quantum master equation