Transmon qubit using Sn as a junction superconductor

• URL: http://arxiv.org/abs/2508.04007v1
• Date: Wed, 06 Aug 2025 01:45:48 GMT
• Title: Transmon qubit using Sn as a junction superconductor
• Authors: Amrita Purkayastha, Amritesh Sharma, Param J. Patel, An-Hsi Chen, Connor P. Dempsey, Shreyas Asodekar, Subhayan Sinha, Maxime Tomasian, Mihir Pendharkar, Christopher J. Palmstrøm, Moïra Hocevar, Kun Zuo, Michael Hatridge, Sergey M. Frolov,
• Abstract summary: Superconductor qubits typically use aluminum-aluminum oxide tunnel junctions to provide the non-linear inductance.<n> Junctions with semiconductor barriers make it possible to vary the superconductor material and explore beyond aluminum.<n>We use InAs semiconductor nanowires coated with thin superconducting shells of beta-Sn to realize transmon qubits.
• Score: 0.20288584947488564
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Superconductor qubits typically use aluminum-aluminum oxide tunnel junctions to provide the non-linear inductance. Junctions with semiconductor barriers make it possible to vary the superconductor material and explore beyond aluminum. We use InAs semiconductor nanowires coated with thin superconducting shells of beta-Sn to realize transmon qubits. By tuning the Josephson energy with a gate voltage, we adjust the qubit frequency over a range of 3 GHz. The longest energy relaxation time, T1 = 27 microseconds, is obtained at the lowest qubit frequencies, while the longest echo dephasing time, T2 = 1.8 microseconds, is achieved at higher frequencies. We assess the possible factors limiting coherence times in these devices and discuss steps to enhance performance through improvements in materials fabrication and circuit design.

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