Suppressing quasiparticle poisoning with a voltage-controlled filter

Abstract

We study single-electron charging events in an Al/InAs nanowire hybrid system with deliberately introduced gapless regions. The occupancy of a Coulomb island is detected using a nearby radio-frequency quantum dot as a charge sensor. We demonstrate that a 1 micron gapped segment of the wire can be used to efficiently suppress single electron poisoning of the gapless region and therefore protect the parity of the island while maintaining good electrical contact with a normal lead. In the absence of protection by charging energy, the 1e switching rate can be reduced below 200 per second. In the same configuration, we observe strong quantum charge fluctuations due to exchange of electron pairs between the island and the lead. The magnetic field dependence of the poisoning rate yields a zero-field superconducting coherence length of ~ 90 nm.

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Cited by in corpus (16)

• Quasiparticle poisoning of Majorana qubits
• All-electrically tunable networks of Majorana bound states
• Minimal Kitaev-transmon qubit based on double quantum dots
• Using materials for quasiparticle engineering
• Gate-tunable kinetic inductance in proximitized nanowires
• Active quasiparticle suppression in a non-equilibrium superconductor
• Experimental review on Majorana zero-modes in hybrid nanowires
• Scalable Fermionic Error Correction in Majorana Surface Codes
• Topological contextuality and anyonic statistics of photonic-encoded parafermions
• Spin-filtered measurements of Andreev bound states
• Combating quasiparticle poisoning with multiple Majorana fermions in a periodically-driven quantum wire
• Electrostatic control of quasiparticle poisoning in a hybrid semiconductor-superconductor island
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Generalized Majorana edge modes in a number-conserving periodically driven $p$-wave superconductor
• Electronic transport in double-nanowire superconducting islands with multiple terminals
• Effects of electron-electron interaction and spin-orbit coupling on Andreev pair qubits in quantum dot Josephson junctions