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Related Experiment Videos

Superconducting Grid-Bus Surface Code Architecture for Hole-Spin Qubits.

Simon E Nigg1, Andreas Fuhrer2, Daniel Loss1

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.

Physical Review Letters
|April 22, 2017
PubMed
Summary
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We developed a scalable hybrid quantum computing architecture using superconducting resonators and nanowire qubits. This design achieves high gate fidelities, nearing the 99% fault tolerance threshold for quantum error correction.

Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Developing scalable quantum computing architectures is crucial for realizing fault-tolerant quantum computation.
  • Hybrid quantum systems offer potential advantages by combining different qubit modalities.
  • The 2D surface code requires high-fidelity quantum gates for effective error correction.

Purpose of the Study:

  • To present a novel scalable hybrid architecture for implementing the 2D surface code.
  • To combine superconducting resonators with hole-spin qubits in nanowires for quantum information processing.
  • To demonstrate a pathway towards fault-tolerant quantum computing using tunable qubit-resonator interactions.

Main Methods:

  • Designed a square lattice of capacitively coupled coplanar waveguide resonators, each hosting a nanowire hole-spin qubit.

Related Experiment Videos

  • Utilized tunable direct Rashba spin-orbit coupling and static electric fields for qubit control and frequency tuning.
  • Implemented an entangling two-qubit gate via a third-order virtual photon transfer process in the dispersive regime.

    • Main Results:

    • Achieved tunable qubit frequencies and couplings via electric field control.
    • Simulated gate fidelities approaching the 99% fault tolerance threshold using state-of-the-art coherence times.
    • Demonstrated the feasibility of a hybrid architecture for scalable quantum computation.

    Conclusions:

    • The proposed hybrid architecture offers a promising route for scalable quantum computing.
    • The demonstrated high gate fidelities are essential for implementing surface code error correction.
    • This work paves the way for building robust quantum processors based on hybrid quantum systems.