Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 3: Quantum Dots and Wires 1: Transport and Electronic Properties

HL 3.3: Vortrag

Montag, 5. September 2022, 10:15–10:30, H32

Interference and parity blockade in transport through a Majorana box — •Maximilian Nitsch¹, Rubén Seoane Souto^{1, 2}, and Martin Leijnse^{1, 2} — ¹Division of Solid State Physics and NanoLund, Lund University, S-22100 Lund, Sweden — ²Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark

A Majorana box - two topological superconducting nanowires coupled via a trivial superconductor - is a building block in devices aiming to demonstrate nonabelian physics, as well as for topological quantum computer architectures. We theoretically investigate charge transport through a Majorana box and show that current can be blocked when two Majoranas couple to the same lead, fixing their parity. In direct analogy to Pauli spin blockade in spin qubits, this parity blockade can be used for fast and high-fidelity qubit initialization and readout, as well as for current-based measurements of decoherence times. Furthermore, we demonstrate that transport can distinguish between a clean Majorana box and a disordered box with additional unwanted Majorana or Andreev bound states.