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Superconducting quantum circuits at the surface code threshold for fault tolerance.

R Barends1, J Kelly1, A Megrant2

  • 11] Department of Physics, University of California, Santa Barbara, California 93106, USA [2].

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|April 25, 2014
PubMed
Summary
This summary is machine-generated.

Superconducting qubits demonstrate high-fidelity quantum logic gates, reaching the fault-tolerance threshold for surface code error correction. This advance paves the way for scalable, fault-tolerant quantum computing using Josephson quantum technology.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Error Correction

Background:

  • Quantum computers promise to solve complex problems but require robust protection of fragile quantum states.
  • Quantum error correction, utilizing entanglement, safeguards logical states across multiple qubits.
  • Superconductivity enables large-scale quantum circuits and microfabrication for qubit development.

Purpose of the Study:

  • To demonstrate a universal set of logic gates in a superconducting multi-qubit processor.
  • To assess the fidelity of quantum gates for surface code error correction.
  • To advance Josephson quantum computing towards fault-tolerant architectures.

Main Methods:

  • Implementation of a five-qubit processor with nearest-neighbor coupling.
  • Execution of a universal set of logic gates on superconducting qubits.
  • Construction of a five-qubit Greenberger-Horne-Zeilinger state.

Main Results:

  • Achieved average single-qubit gate fidelity of 99.92%.
  • Reached two-qubit gate fidelity up to 99.4%.
  • Demonstrated Josephson quantum computing at the fault-tolerance threshold for surface code.

Conclusions:

  • Josephson quantum computing is a high-fidelity technology.
  • The demonstrated fidelities meet the requirements for surface code error correction.
  • This work represents a significant step towards scalable, fault-tolerant quantum circuits.