Transmon qubit modeling and characterization for Dark Matter search
- URL: http://arxiv.org/abs/2409.05988v2
- Date: Tue, 22 Oct 2024 15:02:40 GMT
- Title: Transmon qubit modeling and characterization for Dark Matter search
- Authors: R. Moretti, D. Labranca, P. Campana, R. Carobene, M. Gobbo, M. A. Castellanos-Beltran, D. Olaya, P. F. Hopkins, L. Banchi, M. Borghesi, A. Candido, H. A. Corti, A. D'Elia, M. Faverzani, E. Ferri, A. Nucciotti, L. Origo, A. Pasquale, A. S. Piedjou Komnang, A. Rettaroli, S. Tocci, S. Carrazza, C. Gatti, A. Giachero,
- Abstract summary: This study presents the design, simulation, and experimental characterization of a superconducting transmon qubit circuit prototype.
We describe a planar circuit design featuring two non-interacting transmon qubits, one with fixed frequency and the other tunable flux.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: This study presents the design, simulation, and experimental characterization of a superconducting transmon qubit circuit prototype for potential applications in dark matter detection experiments. We describe a planar circuit design featuring two non-interacting transmon qubits, one with fixed frequency and the other flux tunable. Finite-element simulations were employed to extract key Hamiltonian parameters and optimize component geometries. The qubit was fabricated and then characterized at $20$ mK, allowing for a comparison between simulated and measured qubit parameters. Good agreement was found for transition frequencies and anharmonicities (within 1\% and 10\% respectively) while coupling strengths exhibited larger discrepancies (30\%). We discuss potential causes for measured coherence times falling below expectations ($T_1\sim\,$1-2 \textmu s) and propose strategies for future design improvements. Notably, we demonstrate the application of a hybrid 3D-2D simulation approach for energy participation ratio evaluation, yielding a more accurate estimation of dielectric losses. This work represents an important first step in developing planar Quantum Non-Demolition (QND) single-photon counters for dark matter searches, particularly for axion and dark photon detection schemes.
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