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SiGe quantum wells with oscillating Ge concentrations for quantum dot qubits.

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We introduce the "Wiggle Well" for quantum-dot spin qubits, achieving large, tunable valley splittings. This novel heterostructure enhances qubit performance by leveraging Ge concentration fluctuations within silicon-germanium quantum wells.

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Area of Science:

  • Quantum computing
  • Materials science
  • Condensed matter physics

Background:

  • Quantum-dot spin qubits in Si/SiGe quantum wells necessitate substantial valley splitting for scalability.
  • Current methods for enhancing valley splitting often involve complex fabrication processes like sharp interfaces or barrier modifications.

Purpose of the Study:

  • To propose and experimentally demonstrate a new "Wiggle Well" heterostructure for enhancing valley splitting in quantum-dot spin qubits.
  • To investigate the impact of Ge concentration oscillations within the quantum well on qubit formation and valley splitting.

Main Methods:

  • Fabrication and characterization of the "Wiggle Well" heterostructure with Ge concentration oscillations.
  • Experimental measurement of valley splitting in single-electron quantum dots within the Wiggle Well.
  • Theoretical analysis using tight-binding calculations to understand the origin of observed valley splittings.

Main Results:

  • Successful formation and manipulation of single-electron quantum dots in the Wiggle Well without significant performance degradation.
  • Observation of large and widely tunable valley splittings, ranging from 54 to 239 μeV.
  • Attribution of enhanced valley splitting primarily to amplified random Ge concentration fluctuations rather than deterministic oscillations.

Conclusions:

  • The Wiggle Well heterostructure provides a robust method for enhancing valley splitting in Si/SiGe quantum wells.
  • The observed tunability and magnitude of valley splitting are promising for advancing the development of scalable quantum-dot spin qubit devices.
  • Future qubit designs can benefit from this approach to reliably achieve the necessary energy splittings for improved qubit performance.