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Cryogenic multiplexing using selective area grown nanowires.

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Researchers developed a scalable method using selective area growth of semiconductor nanowires to create integrated quantum circuits. This allows for large-scale characterization of quantum devices, improving materials and device development with statistical certainty.

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Area of Science:

  • Quantum Technology
  • Nanomaterials Science
  • Semiconductor Device Physics

Background:

  • Bottom-up grown nanomaterials are crucial for quantum technologies.
  • Characterizing large numbers of these quantum devices at scale presents significant challenges.
  • Efficient integration and characterization methods are needed for advancing quantum technologies.

Purpose of the Study:

  • To demonstrate large-scale integrated circuits using selective area growth of semiconductor nanowires.
  • To enable large-scale characterization of numerous quantum devices.
  • To establish feasibility of cross-bar gating for scaling quantum circuits.

Main Methods:

  • Harnessing selective area growth (SAG) for semiconductor nanowire fabrication.
  • Designing and fabricating a circuit with 512 quantum devices and multiplexer/demultiplexer pairs.
  • Operating the integrated circuit under deep cryogenic conditions.
  • Performing statistical characterization of large arrays of quantum dots.

Main Results:

  • Demonstrated a large-scale integrated circuit with 512 quantum devices using SAG nanowires.
  • Successfully operated the circuit under deep cryogenic conditions.
  • Established the feasibility of applying cross-bar gating strategies for efficient scaling.
  • Achieved statistical characterization of large quantum dot arrays.

Conclusions:

  • Selective area growth enables scalable fabrication and characterization of quantum devices.
  • Multiplexers are key for efficient scaling of quantum circuits by reducing wiring complexity.
  • Systematic characterization of numerous devices enhances statistical certainty in materials and device development for quantum technologies.