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Researchers demonstrate a novel transmon qubit utilizing semiconductor-superconductor hybrid materials. This innovation allows in-situ control and measurement of qubit properties, revealing insights into gate-controlled environmental coupling.

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Area of Science:

  • Quantum computing
  • Condensed matter physics
  • Materials science

Background:

  • Transmon qubits are crucial for quantum computing.
  • Semiconductor-superconductor hybrid materials offer unique control mechanisms.
  • Field-effect transistors can modulate superconducting circuits.

Purpose of the Study:

  • To investigate transmon qubit characteristics using semiconductor-superconductor hybrid materials.
  • To correlate qubit properties with transport characteristics in the same device.
  • To study the influence of DC monitoring on a live qubit.

Main Methods:

  • Fabrication of a transmon qubit with a tunable semiconductor-superconductor interface.
  • Electrical characterization of qubit frequency, relaxation time, critical supercurrent, and normal-state resistance.
  • In-situ modulation of qubit-environment coupling via a field-effect transistor.

Main Results:

  • Demonstrated electrostatic control over qubit frequency.
  • Established a correlation between qubit relaxation time and transport properties.
  • Quantified the impact of DC monitoring on qubit coherence.
  • Developed a model for gate-controlled environmental coupling.

Conclusions:

  • Semiconductor-superconductor hybrid qubits offer versatile control.
  • Gate-controlled environmental coupling significantly influences qubit relaxation.
  • This platform enables detailed studies of qubit-environment interactions.