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Semiconductor nanowire transmon qubits exhibit unique behaviors in reentrant superconductivity. Winding-induced Andreev states significantly impact qubit coherence, suppressing it as junction density increases.

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Area of Science:

  • Quantum computing
  • Condensed matter physics
  • Superconductivity

Background:

  • Transmon qubits are a leading platform for quantum computation.
  • Superconducting shells on nanowires offer novel qubit designs.
  • Reentrant superconductivity and the Little-Parks effect present unique physical phenomena.

Purpose of the Study:

  • To investigate the behavior of transmon qubits utilizing semiconductor nanowires with superconducting shells.
  • To explore the impact of reentrant superconductivity and phase winding on qubit coherence.
  • To understand the role of Andreev states in qubit performance.

Main Methods:

  • Fabrication of transmon qubits from semiconductor nanowires with integrated superconducting shells.
  • Experimental observation of coherent transitions under varying gate voltages.
  • Numerical simulations to analyze the influence of winding-induced Andreev states.

Main Results:

  • Numerous coherent qubit transitions were observed in the first reentrant lobe (2π phase winding) but not the zeroth lobe.
  • Increasing junction density via gate voltage led to suppression and eventual loss of qubit coherence in the first lobe.
  • Experimental findings align with numerical simulations highlighting Andreev states.

Conclusions:

  • The study demonstrates the critical role of winding-induced Andreev states in the performance of nanowire-based transmon qubits.
  • Coherence in these qubits is sensitive to phase winding and junction density.
  • These findings provide insights for designing and improving superconducting quantum devices.