تقرير
Enhanced Superconducting Qubit Performance Through Ammonium Fluoride Etch
| العنوان: | Enhanced Superconducting Qubit Performance Through Ammonium Fluoride Etch |
|---|---|
| المؤلفون: | Kopas, Cameron J., Goronzy, Dominic P., Pham, Thang, Castanedo, Carlos G. Torres, Cheng, Matthew, Cochrane, Rory, Nast, Patrick, Lachman, Ella, Zhelev, Nikolay Z., Vallieres, Andre, Murthy, Akshay A., Oh, Jin-su, Zhou, Lin, Kramer, Matthew J., Cansizoglu, Hilal, Bedzyk, Michael J., Dravid, Vinayak P., Romanenko, Alexander, Grassellino, Anna, Mutus, Josh Y., Hersam, Mark C., Yadavalli, Kameshwar |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Quantum Physics |
| الوصف: | The performance of superconducting qubits is often limited by dissipation and two-level systems (TLS) losses. The dominant sources of these losses are believed to originate from amorphous materials and defects at interfaces and surfaces, likely as a result of fabrication processes or ambient exposure. Here, we explore a novel wet chemical surface treatment at the Josephson junction-substrate and the substrate-air interfaces by replacing a buffered oxide etch (BOE) cleaning process with one that uses hydrofluoric acid followed by aqueous ammonium fluoride. We show that the ammonium fluoride etch process results in a statistically significant improvement in median $\text{T}_1$ by $\sim22\%$ ($p=0.002$), and a reduction in the number of strongly-coupled TLS in the tunable frequency range. Microwave resonator measurements on samples treated with the ammonium fluoride etch prior to niobium deposition also show $\sim33\%$ lower TLS-induced loss tangent compared to the BOE treated samples. As the chemical treatment primarily modifies the Josephson junction-substrate interface and substrate-air interface, we perform targeted chemical and structural characterizations to examine materials' differences at these interfaces and identify multiple microscopic changes that could contribute to decreased TLS. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2408.02863 |
| رقم الأكسشن: | edsarx.2408.02863 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |