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Gatemon Benchmarking and Two-Qubit Operations.

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Summary
This summary is machine-generated.

Researchers demonstrate hybrid gatemon qubits using semiconductor nanowires for improved quantum control. These novel qubits show high fidelity for single and two-qubit gates, paving the way for scalable quantum computing.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconducting qubits are essential for quantum computation.
  • Conventional transmon qubits often rely on flux control.
  • Hybrid qubits integrating semiconductor Josephson junctions offer new control paradigms.

Purpose of the Study:

  • To investigate the performance of hybrid gatemon qubits with semiconductor nanowire Josephson junctions.
  • To demonstrate the feasibility of voltage-controlled qubit operations.
  • To assess the potential for scalable quantum processors using gatemon technology.

Main Methods:

  • Fabrication and characterization of a two-qubit gatemon circuit.
  • Measurement of qubit coherence and stability.
  • Application of randomized benchmarking for gate error analysis.
  • Demonstration of coherent capacitive coupling and swap operations.
  • Implementation and fidelity estimation of a two-qubit controlled-phase gate.

Main Results:

  • Achieved single-qubit gate errors below 0.7% for all gates, including voltage-controlled Z rotations.
  • Demonstrated coherent capacitive coupling between two gatemons.
  • Successfully performed coherent swap operations.
  • Attained a 91% fidelity for a two-qubit controlled-phase gate.

Conclusions:

  • Hybrid gatemon qubits with semiconductor nanowire Josephson junctions offer complete gate voltage control.
  • These qubits exhibit high coherence, stability, and low gate errors.
  • The demonstrated two-qubit operations confirm the potential of gatemon qubits for scalable quantum computing architectures.