Quantum conformance test

Area of Science:

• Quantum Information Science
• Quantum Metrology
• Statistical Inference

Background:

• Conformance testing is crucial for verifying processes, but classical methods face limitations.
• Processes are modeled by their output probability distributions, particularly pure loss channels.
• Hypothesis testing provides a framework for conformance assessment.

Purpose of the Study:

• To develop and experimentally validate a quantum protocol for process conformance testing.
• To demonstrate a quantum advantage over classical strategies in this task.
• To utilize readily available quantum resources for practical applications.

Main Methods:

• Formulating conformance testing as a hypothesis testing problem.
• Developing a quantum strategy using two-mode squeezed vacuum states.
• Employing photon counting measurements for data acquisition.
• Experimental implementation with optical twin beams.

Main Results:

• Theoretical demonstration of a quantum strategy outperforming classical approaches.
• Experimental validation of the theoretical predictions.
• Quantification of the quantum advantage in a realistic scenario.

Conclusions:

• A practical quantum protocol for conformance testing is established.
• Quantum strategies offer a demonstrable advantage over classical methods for process verification.
• Optical twin beams and photon counting are effective resources for quantum-enhanced metrology.