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Realization of High-Fidelity Perfect Entanglers between Remote Superconducting Quantum Processors.

Juan Song1,2,3, Shuang Yang1, Pei Liu1,4

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Researchers achieved high-fidelity entangling gates between remote superconducting qubits, a crucial step for scalable quantum computing. This breakthrough overcomes limitations in distributed quantum information processing systems.

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Area of Science:

  • Quantum Computing
  • Superconducting Qubits
  • Quantum Information Processing

Background:

  • Superconducting qubits are leading candidates for quantum computing but face scalability challenges.
  • Distributed quantum computing offers a path to larger systems.
  • Direct universal quantum gates between remote qubits are essential but unrealized.

Purpose of the Study:

  • To demonstrate direct high-fidelity entangling gates between remote superconducting quantum processors.
  • To overcome limitations in current distributed quantum computing architectures.

Main Methods:

  • Utilized standing-wave modes in a connecting coaxial cable to link two superconducting quantum processors.
  • Separated the processors by a distance of 30 cm.
  • Employed cross-entropy benchmarking to assess gate fidelity.

Main Results:

  • Achieved high-fidelity controlled-not (CNOT) gates with (99.15±0.02)% fidelity.
  • Achieved high-fidelity controlled-z (CZ) gates with (98.03±0.04)% fidelity.
  • Demonstrated superior fidelity and efficiency compared to state transfer and feedback-based protocols.

Conclusions:

  • This work represents a significant advancement in enabling universal distributed quantum information processing.
  • The demonstrated direct entangling gates are critical for the development of future large-scale quantum systems.
  • Overcomes key challenges in scaling superconducting qubit systems for practical quantum computation.