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TT: Fachverband Tiefe Temperaturen

TT 55: Superconducting Electronics: SQUIDs, Qubits, Circuit QED III

TT 55.2: Vortrag

Freitag, 21. März 2025, 09:45–10:00, H36

Argon milling strategies for Tantalum Transmon qubits — •Philipp Lenhard¹, Mathieu Fechant¹, Ritika Dhundhwal¹, Thomas Reisinger¹, and Ioan M. Pop^1,2,3 — ¹IQMT, Karlsruhe Institute of Technology — ²PHI, Karlsruhe Institute of Technology — ³1. Physikalisches Institut, University of Stuttgart

Tantalum has emerged as a promising material for enhancing the coherence time of superconducting qubits [1,2]. This study focuses on the fabrication of qubits, emphasizing the necessity of establishing a coherent contact between Ta-based structures and Al/AlO_x/Al Josephson junctions. The removal of native oxide layers via Argon milling is critical to this process. We present various approaches to achieve optimal contact through Argon milling, along with a discussion of the associated challenges and potential solutions.

[1] Place et al., Nat. Commun. 12:1779 (2021).

[2] Ganjam et al., Nat. Commun. 15:3687 (2024).

Keywords: superconducting qubits; transmon; tantalum; argon milling