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This study introduces a new method for verifying quantum devices by measuring quantum state fidelity using only local measurements. This protocol enables cross-platform comparisons of quantum simulators and computers.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Simulation

Background:

  • Verifying the performance of quantum devices is crucial for advancing quantum technologies.
  • Comparing quantum states across different experimental platforms presents a significant challenge.

Purpose of the Study:

  • To develop a protocol for cross-platform verification of quantum simulators and quantum computers.
  • To enable direct measurement of quantum state fidelity between separate experimental platforms.

Main Methods:

  • Utilizing local measurements in randomized product bases.
  • Employing classical communication of measurement results.
  • Directly measuring trace overlap (Tr[ρ₁ρ₂]) and purities (Tr[ρ₁₂²]) to determine fidelity.

Main Results:

  • Demonstrated a method to calculate the fidelity of two quantum states (ρ₁ and ρ₂) prepared on separate platforms.
  • Successfully measured experiment-theory fidelities for entangled 10-qubit states.
  • The protocol requires only local measurements, simplifying experimental complexity.

Conclusions:

  • The developed protocol provides a robust method for cross-platform verification of quantum devices.
  • This technique is applicable to both quantum simulators and quantum computers.
  • The method facilitates accurate fidelity assessment of complex quantum states, such as entangled 10-qubit states.