Direct visualization of quasiparticle concentration around superconducting vortices

Bogoliubov quasiparticles play a crucial role in understanding the behavior of a superconductor, and in achieving reliable operations of superconducting quantum circuits. Diagnosis of quasiparticle poisoning at the nanoscale provides invaluable benefits in designing superconducting qubits. Here, we...

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Bibliographic Details
Published inarXiv.org
Main Authors Jian-Feng, Ge, Bastiaans, Koen M, Niu, Jiasen, Benschop, Tjerk, Maialen Ortego Larrazabal, Allan, Milan P
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 30.04.2024
Subjects
Circuit reliability
Elementary excitations
Qubits (quantum computing)
Superconductivity
Vortices
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Summary:Bogoliubov quasiparticles play a crucial role in understanding the behavior of a superconductor, and in achieving reliable operations of superconducting quantum circuits. Diagnosis of quasiparticle poisoning at the nanoscale provides invaluable benefits in designing superconducting qubits. Here, we use scanning tunneling noise microscopy to locally quantify quasiparticles by measuring the effective charge. Using the vortex lattice as a model system, we directly visualize the spatial variation of the quasiparticle concentration around superconducting vortices, which can be described within the Ginzburg-Landau framework. This shows a direct, noninvasive approach for the atomic-scale detection of relative quasiparticle concentration as small as 10-4 in various superconducting qubit systems. Our results alert of a quick increase in quasiparticle concentration with decreasing intervortex distance in vortex-based Majorana qubits.
ISSN:2331-8422