$d$-mon: transmon with strong anharmonicity

• URL: http://arxiv.org/abs/2308.02547v2
• Date: Wed, 9 Aug 2023 20:33:41 GMT
• Title: $d$-mon: transmon with strong anharmonicity
• Authors: Hrishikesh Patel, Vedangi Pathak, Oguzhan Can, Andrew C. Potter, Marcel Franz
• Abstract summary: We propose a novel qubit architecture based on a planar $c$-axis Josephson junction between a thin flake $d$-wave superconductor. The proposed device operates in a regime where quasiparticles are fully gapped and can be expected to achieve long coherence times.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We propose a novel qubit architecture based on a planar $c$-axis Josephson junction between a thin flake $d$-wave superconductor ($d$SC), such as a high-$T_c$ cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$, and a conventional $s$-wave superconductor. When operated in the transmon regime the device -- that we call "$d$-mon" -- becomes insensitive to offset charge fluctuations and, importantly, exhibits at the same time energy level spectrum with strong anharmonicity that is widely tunable through the device geometry and applied magnetic flux. Crucially, unlike previous qubit designs based on $d$-wave superconductors the proposed device operates in a regime where quasiparticles are fully gapped and can be therefore expected to achieve long coherence times.

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