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

Morteza Aghaee, S. A. Khan

Featured June 10, 2026

Original Paper

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Simply

By using a better superconducting material (Lead) and improved semiconductor design, the authors made tiny quantum computing building blocks called tetrons incredibly stable, achieving record-long parity lifetimes of 20 seconds.

In depth
The study significantly advances topological quantum computing by engineering superconductor-semiconductor hybrid devices with a higher-gap superconductor (Lead instead of Aluminum) and an optimized semiconductor heterostructure. This material improvement, combined with a novel rf measurement technique for precise characterization, leads to a dramatic increase in Majorana parity lifetimes to over 20 seconds, making non-equilibrium quasiparticles no longer the limiting factor for qubit operations.

Key Takeaways

  • 1
    The authors achieved a 20-second Majorana parity lifetime in InAs-Pb tetron devices, an improvement of over three orders of magnitude compared to previous Al-based designs.
  • 2
    They developed an rf measurement technique that precisely resolves low-energy wire-end states and directly measures their energy splitting () with precision, enabling scalable device tuning.
  • 3
    The enhanced performance stems from replacing Aluminum with higher-gap Lead and optimizing the semiconductor heterostructure (GaSb substrate, InAs/InAsSb quantum well) to increase the topological gap and spin-orbit coupling.

Conceptual Flow

HIGH LEVEL
1
Methodology: Building More Robust Quantum Bits

The scientists built quantum bits using new materials that are much better at protecting fragile quantum information from errors.

Old Materials
Short Lifetime
Upgrade Components
New Materials
Long Lifetime
2
Results: Unprecedented Quantum Bit Stability

They found their new quantum bits could hold their special 'parity' state for 20 seconds, which is like a super long time in the quantum world.

Old Quantum Bit
Flipped Quickly
New Design
New Quantum Bit
Stays Stable Longer