20 Second Parity Lifetime in an InAs--Pb Tetron Device

• URL: http://arxiv.org/abs/2606.03884v2
• Date: Wed, 03 Jun 2026 01:49:57 GMT
• Title: 20 Second Parity Lifetime in an InAs--Pb Tetron Device
• Abstract summary: A central promise of topological quantum computing is that increasing the excitation gap improves device performance significantly.<n>Here, we experimentally validate this principle in an InAs--Pb tetron device via interferometric single-shot parity measurements.
• Score: 19.64839782254779
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A central promise of topological quantum computing is that increasing the excitation gap improves device performance significantly. Here, we experimentally validate this principle in an InAs--Pb tetron device via interferometric single-shot parity measurements. By replacing aluminum with the higher-gap superconductor lead in our superconductor-semiconductor hybrid devices, we have improved the robustness of our topological phase. In addition, to enable fast and precise bring-up at scale, we have developed an rf measurement technique that resolves low-energy wire-end states and directly measures their energy splitting with $μ\text{eV}$ precision. We employ this technique to bring up a device in a multi-tetron array and perform parity measurements of one of the tetron's hybrid nanowires (NWs). By controllably switching the wire parity, we observe $h/2e$-periodic bimodal shifts in the quantum capacitance of a quantum dot coupled to the hybrid nanowire in an interference loop. Further time-resolved measurements reveal a characteristic parity switching time of $\sim 20$ s with some instances reaching minute-scale. Such extremely long parity lifetimes are orders of magnitude longer than typical qubit operation times, which are on the order of $μ\text{s}$. Finally, we discuss potential implications for the fidelity of Pauli measurements.

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