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  3. Transmon Qubit Using Sn As A Junction Superconductor.
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  3. Transmon Qubit Using Sn As A Junction Superconductor.

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Transmon Qubit Using Sn as a Junction Superconductor.

Amrita Purkayastha1, Amritesh Sharma1, Param J Patel1

  • 1Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States.

Nano Letters
|February 9, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed transmon qubits using semiconductor nanowires, achieving adjustable frequencies and significant coherence times. This work explores new materials for quantum computing beyond traditional aluminum-based qubits.

Keywords:
InAs nanowiresJosephson junctionscoherence timeproximity effectsuperconductor−semiconductor hybridtransmon qubitβ-Sn

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Area of Science:

  • Quantum computing
  • Condensed matter physics
  • Materials science

Background:

  • Superconducting qubits commonly utilize aluminum-aluminum oxide tunnel junctions for nonlinear inductance.
  • Exploring alternative materials for qubit fabrication is crucial for advancing quantum technologies.

Purpose of the Study:

  • To realize transmon qubits using InAs semiconductor nanowires coated with β-Sn superconducting shells.
  • To investigate the tunability of qubit frequency and coherence times in these novel devices.

Main Methods:

  • Fabrication of transmon qubits with InAs nanowire cores and β-Sn superconducting shells.
  • Utilizing gate voltage to tune Josephson energy and qubit frequency.
  • Measuring energy relaxation time (T1) and echo dephasing time (T2) to assess coherence.

Main Results:

  • Successfully realized tunable transmon qubits with a frequency range of 3 GHz.
  • Achieved a maximum energy relaxation time (T1) of 27 μs at lower frequencies.
  • Obtained a maximum echo dephasing time (T2) of 1.8 μs at higher frequencies.

Conclusions:

  • InAs nanowire-based superconducting qubits offer a promising platform for quantum information processing.
  • Coherence times are influenced by qubit frequency, with potential for enhancement through improved fabrication and circuit design.