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Giuseppe Ortolano1,2, Pauline Boucher1, Ivo Pietro Degiovanni1

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This study introduces a quantum strategy for process conformance testing, outperforming classical methods. Experiments confirm a quantum advantage in realistic settings using optical twin beams.

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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.