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Efficient Experimental Verification of Quantum Gates with Local Operations.

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Quantum gate verification (QGV) now efficiently checks quantum gate functionality, overcoming the dimensionality curse. This method uses minimal measurements, proving robust for quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing Verification

Background:

  • Verifying quantum gates is essential for reliable quantum information processing.
  • The dimensionality curse makes verification challenging for large quantum systems.
  • Theoretical advances suggest optimal sample complexity for gate verification using local operations.

Purpose of the Study:

  • To propose a quantum gate verification (QGV) method robust to imperfections.
  • To experimentally demonstrate efficient QGV for 2-qubit CNOT and 3-qubit Toffoli gates.
  • To address the dimensionality curse in quantum device verification.

Main Methods:

  • Developed a variant of quantum gate verification (QGV).
  • Utilized only local state preparations and measurements for experiments.
  • Applied QGV to a 2-qubit controlled-not gate and a 3-qubit Toffoli gate.

Main Results:

  • Achieved efficient QGV with low sample complexity.
  • Verified a CNOT gate with fidelity >= 99% using 1600 measurements (95% confidence).
  • Verified a Toffoli gate with fidelity >= 97% using 2600 measurements (95% confidence).

Conclusions:

  • QGV offers a solution to the dimensionality curse in quantum gate verification.
  • The proposed method is experimentally feasible and robust to practical imperfections.
  • This work advances the verification of large-scale quantum devices.