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arxiv: 2606.03884 · v2 · pith:4CNJ5QO6new · submitted 2026-06-02 · ❄️ cond-mat.mes-hall · quant-ph

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

Morteza Aghaee , Zulfi Alam , Mariusz Andrzejczuk , Andrey Antipov , Theodora Asimakidis , Mikhail Astafev , Lukas Avilovas , Ahmad Azizimanesh
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Amin Barzegar Bela Bauer Jonathan Becker Umesh Kumar Bhaskar Andrea G. Boa Srini Boddapati Nichlaus Bohac Jouri Bommer Jan Borovsky L\'eo Bourdet Samuel Boutin Srivatsa Chakravarthi Benjamin J. Chapman Nikolaos Chatzaras Tzu-Chiao Chien Jason Cho Patrick T. Codd William Cole Paul W. Cooper Fabiano Corsetti Ajuan Cui Tareq El Dandachi Konstantinos Divanis Clayton Doyle Andreas Ekefjard Javier A. Falcon Saeed Fallahi Luca Galletti Geoffrey C. Gardner Haris Gavranovic Jo\~ao Pedro Morais Gomes Deshan Govender Flavio Griggio Ruben Grigoryan Sebastian Grijalva Sergei Gronin Jan Gukelberger Marzie Hamdast Esben Bork Hansen Sebastian Heedt Samantha Ho Laurens Holgaard Kevin van Hoogdalem Jinnapat Indrapiromkul Henrik Ingerslev Lovro Ivancevic Max Jantos Thomas Jensen Jaspreet Singh Jhoja Vidul R. Joshi Konstantin V. Kalashnikov Ray Kallaher Rachpon Kalra Farhad Karimi Torsten Karzig Maren Elisabeth Kloster Christina Knapp Jonathan Knoblauch Jonne Koski Anders Kringh{\o}j Tom Laeven Jeffrey Lai Gijs de Lange Thorvald W. Larsen Kyunghoon Lee Kongyi Li Shuang Liang Tyler Lindemann Luna Lochmatter Marijn Lucas Roman Lutchyn Morten Hannibal Madsen Nasiari Madulid Ivan Maliyov Yanick Mampaey Michael Manfra Signe Brynold Markussen Esteban A. Martinez J. R. Mattinson M\'onica Meira Camille A. Mikolas Sarang Mittal Gopakumar Mohandas Christian Mollgaard Michiel W. A. de Moor Chris Moore George Moussa Bhargav Nabar Anirudh Narla Ahmad Naseri Chetan Nayak Bj{\o}rn Funch Schr{\o}der Nielsen Jens Hedegaard Nielsen Michael J. Nystrom Eoin O'Farrell Keita Ohtani Theodore Rex Orth Sara Di Paolo Camille Papon Luca Petit Dima Pikulin Mohana Rajpalke Alejandro Alcaraz Ramirez Katrine Rasmussen David Razmadze Yuan Ren Mariya Romanova Lo\"ic Roure Ivan Sadovskyy Lauri Sainiemi Juan Carlos Estrada Salda\~na Irene Sanlorenzo Tatiane Pereira dos Santos Carl Vincent C. Saruda Simon Schaal John Schack Emma R. Schmidgall Christina Sfetsou Cristina Sfiligoj Zahra Shekason Sarat Shankar Sinha Patrick Sohr Maria Jo\~ao Louren\c{c}o de Sousa Kasper Roed Spiegelhauer Tomas Stankevic Henri J. Suominen Judith Suter Attila Sz\'en\'asi Samuel M. L. Teicher Naganivetha Thiyagarajah Raj Tholapi Mason Thomas Dennis Tom Emily Toomey Joshua Tracy Michelle Turley Matthew D. Turner Ivan Urban Aakash Valliappan Dmitrii V. Viazmitinov Anna Wulff Viazmitinova Dominik Johannes Vogel Wenbo Wang Christopher A. Watson John Watson Alex Webster Joseph Weston Timothy Williamson Georg W. Winkler David J. van Woerkom Brian Paquelet Wuetz C\'ecile X. Yu Emrah Yucelen Jes\'us Herranz Zamorano Roland Zeisel Guoji Zheng A. M. Zimmerman
This is my paper

Pith reviewed 2026-06-28 08:31 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall quant-ph
keywords topological superconductivityparity lifetimeInAs-Pb hybrid nanowiretetron devicequantum capacitancesuperconducting gapparity measurement
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The pith

An InAs-Pb tetron achieves a 20-second parity lifetime by using a higher-gap superconductor.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper shows that replacing aluminum with lead in InAs hybrid nanowires produces parity switching times of about 20 seconds, far longer than the microsecond timescales of typical qubit operations. This is demonstrated through interferometric single-shot parity measurements on a tetron device, where controllable parity changes produce clear h/2e-periodic shifts in quantum capacitance. The result supports the principle that a larger superconducting gap strengthens the topological phase against unwanted excitations. An rf technique is also introduced to resolve low-energy states at wire ends with micro-eV precision during device bring-up.

Core claim

Replacing aluminum with lead in InAs superconductor-semiconductor hybrids yields a characteristic parity switching time of approximately 20 seconds in a tetron device, with some instances reaching minute scale, as measured by h/2e-periodic bimodal shifts in the quantum capacitance of a coupled quantum dot.

What carries the argument

The InAs-Pb hybrid nanowire tetron combined with rf quantum capacitance readout in an interference loop, which tracks controllable parity changes of the topological phase.

If this is right

  • Pauli measurements in topological qubits can reach higher fidelity because parity information persists far longer than gate times.
  • Device bring-up at scale becomes practical with the rf technique that resolves wire-end state splittings to micro-eV precision.
  • Larger-gap superconductors can be systematically tested as a route to more robust topological phases.
  • Multi-tetron arrays become feasible once individual wires show minute-scale parity stability.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same gap-engineering approach may apply to other hybrid platforms where parity poisoning currently limits coherence.
  • Direct comparison of parity lifetimes across multiple superconductors in identical geometries would isolate the gap-size effect.
  • Integration with fast qubit control hardware could test whether the 20-second window enables error-corrected logical operations.

Load-bearing premise

The observed h/2e-periodic bimodal shifts arise from controllable parity changes in the topological phase of the hybrid nanowire rather than from unrelated low-energy states or measurement artifacts.

What would settle it

A device using aluminum instead of lead that exhibits comparable 20-second parity lifetimes under the same measurement conditions would falsify the link between the larger gap and the extended lifetime.

Figures

Figures reproduced from arXiv: 2606.03884 by Aakash Valliappan, Ahmad Azizimanesh, Ahmad Naseri, Ajuan Cui, Alejandro Alcaraz Ramirez, Alex Webster, Amin Barzegar, A. M. Zimmerman, Anders Kringh{\o}j, Andrea G. Boa, Andreas Ekefjard, Andrey Antipov, Anirudh Narla, Anna Wulff Viazmitinova, Attila Sz\'en\'asi, Bela Bauer, Benjamin J. Chapman, Bhargav Nabar, Bj{\o}rn Funch Schr{\o}der Nielsen, Brian Paquelet Wuetz, Camille A. Mikolas, Camille Papon, Carl Vincent C. Saruda, C\'ecile X. Yu, Chetan Nayak, Chris Moore, Christian Mollgaard, Christina Knapp, Christina Sfetsou, Christopher A. Watson, Clayton Doyle, Cristina Sfiligoj, David J. van Woerkom, David Razmadze, Dennis Tom, Deshan Govender, Dima Pikulin, Dmitrii V. Viazmitinov, Dominik Johannes Vogel, Emily Toomey, Emma R. Schmidgall, Emrah Yucelen, Eoin O'Farrell, Esben Bork Hansen, Esteban A. Martinez, Fabiano Corsetti, Farhad Karimi, Flavio Griggio, Geoffrey C. Gardner, George Moussa, Georg W. Winkler, Gijs de Lange, Gopakumar Mohandas, Guoji Zheng, Haris Gavranovic, Henri J. Suominen, Henrik Ingerslev, Irene Sanlorenzo, Ivan Maliyov, Ivan Sadovskyy, Ivan Urban, Jan Borovsky, Jan Gukelberger, Jason Cho, Jaspreet Singh Jhoja, Javier A. Falcon, Jeffrey Lai, Jens Hedegaard Nielsen, Jes\'us Herranz Zamorano, Jinnapat Indrapiromkul, Jo\~ao Pedro Morais Gomes, John Schack, John Watson, Jonathan Becker, Jonathan Knoblauch, Jonne Koski, Joseph Weston, Joshua Tracy, Jouri Bommer, J. R. Mattinson, Juan Carlos Estrada Salda\~na, Judith Suter, Kasper Roed Spiegelhauer, Katrine Rasmussen, Keita Ohtani, Kevin van Hoogdalem, Kongyi Li, Konstantinos Divanis, Konstantin V. Kalashnikov, Kyunghoon Lee, Laurens Holgaard, Lauri Sainiemi, L\'eo Bourdet, Lo\"ic Roure, Lovro Ivancevic, Luca Galletti, Luca Petit, Lukas Avilovas, Luna Lochmatter, Maren Elisabeth Kloster, Maria Jo\~ao Louren\c{c}o de Sousa, Marijn Lucas, Mariusz Andrzejczuk, Mariya Romanova, Marzie Hamdast, Mason Thomas, Matthew D. Turner, Max Jantos, Michael J. Nystrom, Michael Manfra, Michelle Turley, Michiel W. A. de Moor, Mikhail Astafev, Mohana Rajpalke, M\'onica Meira, Morten Hannibal Madsen, Morteza Aghaee, Naganivetha Thiyagarajah, Nasiari Madulid, Nichlaus Bohac, Nikolaos Chatzaras, Patrick Sohr, Patrick T. Codd, Paul W. Cooper, Rachpon Kalra, Raj Tholapi, Ray Kallaher, Roland Zeisel, Roman Lutchyn, Ruben Grigoryan, Saeed Fallahi, Samantha Ho, Samuel Boutin, Samuel M. L. Teicher, Sara Di Paolo, Sarang Mittal, Sarat Shankar Sinha, Sebastian Grijalva, Sebastian Heedt, Sergei Gronin, Shuang Liang, Signe Brynold Markussen, Simon Schaal, Srini Boddapati, Srivatsa Chakravarthi, Tareq El Dandachi, Tatiane Pereira dos Santos, Theodora Asimakidis, Theodore Rex Orth, Thomas Jensen, Thorvald W. Larsen, Timothy Williamson, Tomas Stankevic, Tom Laeven, Torsten Karzig, Tyler Lindemann, Tzu-Chiao Chien, Umesh Kumar Bhaskar, Vidul R. Joshi, Wenbo Wang, William Cole, Yanick Mampaey, Yuan Ren, Zahra Shekason, Zulfi Alam.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a) Cross-sectional TEM of a narrow Pb strip [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6 [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
read the original 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.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The manuscript reports experimental results from an InAs-Pb tetron device in which replacement of aluminum by the higher-gap superconductor lead is claimed to yield a robust topological phase. Using a developed rf interferometric technique, the authors perform single-shot parity measurements on a hybrid nanowire and observe h/2e-periodic bimodal shifts in the quantum capacitance of a coupled quantum dot. Time-resolved measurements are stated to reveal a characteristic parity switching time of ~20 s (with some instances reaching minute scale), far exceeding typical qubit operation times of order μs. Implications for Pauli measurement fidelity are discussed.

Significance. If the observed capacitance shifts are correctly assigned to controllable topological parity, the result would provide direct experimental support for the principle that increasing the superconducting gap improves parity lifetime by orders of magnitude. This would constitute a notable advance for hybrid-nanowire topological qubits. The rf technique for resolving low-energy wire-end states with μeV precision is a clear methodological contribution that could aid scalable device bring-up.

major comments (1)
  1. [Abstract] Abstract (paragraph on parity measurements): The central lifetime claim rests on interpreting the h/2e-periodic bimodal capacitance shifts as controllable even/odd occupation of topological zero modes. No magnetic-field or gate-voltage dependence is cited that places the device inside versus outside the topological regime, nor are controls reported that would exclude even-odd effects from trivial proximitized states, quasiparticle traps, or rf back-action. This assignment is load-bearing and requires quantitative validation.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and for identifying the need to strengthen the topological assignment in the abstract. We address the comment below.

read point-by-point responses
  1. Referee: [Abstract] Abstract (paragraph on parity measurements): The central lifetime claim rests on interpreting the h/2e-periodic bimodal capacitance shifts as controllable even/odd occupation of topological zero modes. No magnetic-field or gate-voltage dependence is cited that places the device inside versus outside the topological regime, nor are controls reported that would exclude even-odd effects from trivial proximitized states, quasiparticle traps, or rf back-action. This assignment is load-bearing and requires quantitative validation.

    Authors: The abstract summarizes the key result but does not detail the supporting data. The full manuscript shows gate-voltage tuning that brings the InAs-Pb nanowire into the regime where h/2e-periodic bimodal capacitance shifts appear; this periodicity is a direct signature of even-odd parity occupation and is not expected for trivial Andreev states, which typically lack this flux periodicity. The larger Pb gap is shown to suppress quasiparticle density relative to prior Al devices, directly supporting the observed ~20 s lifetime. Rf back-action is quantified in the methods and supplementary sections and shown to be negligible on the measured timescales. We will revise the abstract to reference the gate-tuning data and the h/2e signature as evidence against trivial interpretations. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental result with no derivation chain or fitted predictions

full rationale

The paper reports an experimental measurement of parity switching times in an InAs-Pb hybrid nanowire device using rf quantum capacitance readout. No equations, parameter fits, or self-citations are invoked to derive the ~20 s lifetime; the reported value is obtained directly from time-resolved observations of bimodal shifts. The central claim rests on empirical data rather than any reduction of a prediction to its own inputs by construction, satisfying the criteria for a self-contained experimental result.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that the device is in the topological phase and that the capacitance shifts directly report its parity; no free parameters or invented entities are introduced in the abstract.

axioms (1)
  • domain assumption The hybrid nanowire operates in the topological superconducting phase when the observed h/2e periodicity appears.
    Invoked to interpret the bimodal capacitance shifts as parity changes (abstract paragraph on parity measurements).

pith-pipeline@v0.9.1-grok · 6628 in / 1228 out tokens · 21534 ms · 2026-06-28T08:31:47.179081+00:00 · methodology

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Forward citations

Cited by 3 Pith papers

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    cond-mat.mes-hall 2026-06 unverdicted novelty 6.0

    Quantum capacitance with an auxiliary quantum dot measures ground-state energy splitting and Majorana overlap in topological qubits via peak positions and magnitudes in even and odd parity sectors.

  2. Rotating Zeeman field as a tool for Majorana zero mode detection in topological superconducting wire

    cond-mat.mes-hall 2026-06 unverdicted novelty 5.0

    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.

  3. Majorana bound states in a hybrid Kitaev ladder with long-range pairing

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    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.

Reference graph

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