InAs-Pb hybrid nanowire tetron achieves ~20 s parity switching time with h/2e-periodic bimodal capacitance shifts, using a new rf technique to resolve wire-end states at μeV precision.
20 Second Parity Lifetime in an InAs--Pb Tetron Device
3 Pith papers cite this work. Polarity classification is still indexing.
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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 $\mu\text{eV}$ 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 $\mu\text{s}$. Finally, we discuss potential implications for the fidelity of Pauli measurements.
years
2026 3verdicts
UNVERDICTED 3representative citing papers
Rotating the Zeeman field in the wire attached to a quantum dot reveals Majorana zero modes through significant changes in dot spin polarization and identifies the topological transition via non-linear field dependence.
Varying the long-range pairing exponent in a hybrid Kitaev ladder shifts topological phase boundaries and induces a transition from two to four Majorana zero modes with a crossover regime containing massive Dirac modes.
citing papers explorer
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20 Second Parity Lifetime in an InAs--Pb Tetron Device
InAs-Pb hybrid nanowire tetron achieves ~20 s parity switching time with h/2e-periodic bimodal capacitance shifts, using a new rf technique to resolve wire-end states at μeV precision.
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Rotating Zeeman field as a tool for Majorana zero mode detection in topological superconducting wire
Rotating the Zeeman field in the wire attached to a quantum dot reveals Majorana zero modes through significant changes in dot spin polarization and identifies the topological transition via non-linear field dependence.
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Majorana bound states in a hybrid Kitaev ladder with long-range pairing
Varying the long-range pairing exponent in a hybrid Kitaev ladder shifts topological phase boundaries and induces a transition from two to four Majorana zero modes with a crossover regime containing massive Dirac modes.