arXiv · 2606.03884
20 Second Parity Lifetime in an InAs--Pb Tetron Device
Abstract
A central promise of topological quantum computing is that increasing the excitation gap improves device performance significantly. Here, we experimentally validate this principle in an InAs--Pb tetron device via interferometric single-shot parity measurements. By replacing aluminum with the higher-gap superconductor lead in our superconductor-semiconductor hybrid devices, we have improved the robustness of our topological phase. In addition, to enable fast and precise bring-up at scale, we have developed an rf measurement technique that resolves low-energy wire-end states and directly measures their energy splitting with $μ\text{eV}$ precision. We employ this technique to bring up a device in a multi-tetron array and perform parity measurements of one of the tetron's hybrid nanowires (NWs). By controllably switching the wire parity, we observe $h/2e$-periodic bimodal shifts in the quantum capacitance of a quantum dot coupled to the hybrid nanowire in an interference loop. Further time-resolved measurements reveal a characteristic parity switching time of $\sim 20$ s with some instances reaching minute-scale. Such extremely long parity lifetimes are orders of magnitude longer than typical qubit operation times, which are on the order of $μ\text{s}$. Finally, we discuss potential implications for the fidelity of Pauli measurements.
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Morteza Aghaee, Zulfi Alam, Mariusz Andrzejczuk, Andrey Antipov, Theodora Asimakidis, Mikhail Astafev, Lukas Avilovas, Ahmad Azizimanesh, Amin Barzegar, Bela Bauer, Jonathan Becker, Umesh Kumar Bhaskar, Andrea G. Boa, Srini Boddapati, Nichlaus Bohac, Jouri Bommer, Jan Borovsky, Léo Bourdet, Samuel Boutin, Srivatsa Chakravarthi, Benjamin J. Chapman, Nikolaos Chatzaras, Tzu-Chiao Chien, Jason Cho, Patrick T. Codd, William Cole, Paul W. Cooper, Fabiano Corsetti, Ajuan Cui, Tareq El Dandachi, Konstantinos Divanis, Clayton Doyle, Andreas Ekefjard, Javier A. Falcon, Saeed Fallahi, Luca Galletti, Geoffrey C. Gardner, Haris Gavranovic, João Pedro Morais Gomes, Deshan Govender, Flavio Griggio, Ruben Grigoryan, Sebastian Grijalva, Sergei Gronin, Jan Gukelberger, Marzie Hamdast, Esben Bork Hansen, Sebastian Heedt, Samantha Ho, Laurens Holgaard, Kevin van Hoogdalem, Jinnapat Indrapiromkul, Henrik Ingerslev, Lovro Ivancevic, Max Jantos, Thomas Jensen, Jaspreet Singh Jhoja, Vidul R. Joshi, Konstantin V. Kalashnikov, Ray Kallaher, Rachpon Kalra, Farhad Karimi, Torsten Karzig, Maren Elisabeth Kloster, Christina Knapp, Jonathan Knoblauch, Jonne Koski, Anders Kringhøj, Tom Laeven, Jeffrey Lai, Gijs de Lange, Thorvald W. Larsen, Kyunghoon Lee, Kongyi Li, Shuang Liang, Tyler Lindemann, Luna Lochmatter, Marijn Lucas, Roman Lutchyn, Morten Hannibal Madsen, Nasiari Madulid, Ivan Maliyov, Yanick Mampaey, Michael Manfra, Signe Brynold Markussen, Esteban A. Martinez, J. R. Mattinson, Mónica Meira, Camille A. Mikolas, Sarang Mittal, Gopakumar Mohandas, Christian Mollgaard, Michiel W. A. de Moor, Chris Moore, George Moussa, Bhargav Nabar, Anirudh Narla, Ahmad Naseri, Chetan Nayak, Bjørn Funch Schrøder Nielsen. 2026-06-03. 20 Second Parity Lifetime in an InAs--Pb Tetron Device. https://arxiv.org/abs/2606.03884
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