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Gatemon Qubit on a Germanium Quantum-Well Heterostructure.

Elyjah Kiyooka1, Chotivut Tangchingchai1, Leo Noirot1

  • 1Université Grenoble Alpes,CEA, Grenoble INP, IRIG, PHELIQS, 38000 Grenoble, France.

Nano Letters
|December 17, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel gatemon qubit using a germanium (Ge) quantum well, demonstrating gate-tunable superconducting properties. This breakthrough validates a new platform for advanced quantum computing components.

Keywords:
2D materialsJosephson junctiongermaniumsuperconducting qubit

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Superconducting Circuits

Background:

  • Gatemons are superconducting qubits that utilize a gate-tunable semiconducting weak link.
  • Existing superconducting qubits often rely on Josephson junctions, but gate-tunability offers enhanced control.
  • Germanium-based heterostructures are emerging as promising platforms for quantum devices.

Purpose of the Study:

  • To engineer and characterize a gatemon qubit device utilizing a Ge/SiGe heterostructure.
  • To investigate the superconducting proximity effect in a Ge quantum well for qubit applications.
  • To demonstrate gate-voltage tunability of qubit properties and assess coherence times.

Main Methods:

  • Fabrication of a gatemon device with an aluminum microwave circuit on a Ge/SiGe heterostructure.
  • Utilizing the two-dimensional hole gas in the Ge quantum well as a gate-tunable weak link.
  • Performing Rabi oscillation and Ramsey interference measurements to probe qubit dynamics.

Main Results:

  • Demonstrated a gate-tunable qubit frequency over a 3.5 GHz range.
  • Achieved relaxation times (T1) up to 119 ns and Ramsey coherence times (T2*) up to 70 ns.
  • Reproduces results from similar Ge/SiGe heterostructure platforms, confirming device viability.

Conclusions:

  • The Ge/SiGe heterostructure platform successfully hosts a functional gatemon qubit.
  • This work validates a novel approach for creating gate-tunable superconducting weak links.
  • The platform shows potential for developing gatemons and parity-protected cos(2ϕ) qubits.