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Area of Science:

  • Quantum Computing
  • Materials Science
  • Microfabrication

Background:

  • High-coherence qubits are essential for fault-tolerant quantum computers.
  • Sapphire substrates support high-coherence qubits due to their low-loss dielectric properties.
  • Current limitations in sapphire processing restrict quantum processors to small scales or chiplet architectures.

Purpose of the Study:

  • To demonstrate a sapphire machining process compatible with high-coherence qubits.
  • To enable through-substrate electrical connections and signal routing in sapphire-based quantum processors.
  • To facilitate the scaling of quantum processing units (QPUs) using sapphire.

Main Methods:

  • Development of a specialized sapphire machining technique.
  • Integration of the machining process with intermediate-scale quantum processors.
  • Demonstration of through-substrate electrical connections for mode-mitigation and signal routing.

Main Results:

  • The demonstrated machining process is compatible with high-coherence qubits.
  • Through-substrate electrical connections were successfully achieved in sapphire.
  • The technique provides a pathway for scaling sapphire-based quantum processing units.

Conclusions:

  • The developed sapphire machining process overcomes previous limitations in scaling quantum processors.
  • This advancement allows for integrated mode-mitigation and signal routing in larger sapphire QPUs.
  • The process enables the use of sapphire-compatible materials for large-scale quantum computing applications.