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Related Experiment Video

Updated: Jun 22, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Experimental quantum process discrimination.

Anthony Laing1, Terry Rudolph, Jeremy L O'Brien

  • 1Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol, BS8 1UB, United Kingdom.

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

Researchers can now distinguish between unknown quantum processes, even when they are not perfectly distinct. This breakthrough uses entanglement and classical communication for high-confidence quantum process discrimination.

Related Experiment Videos

Last Updated: Jun 22, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Computing

Background:

  • Distinguishing quantum processes is crucial for quantum information processing.
  • Nonorthogonal quantum processes pose a significant challenge for discrimination.
  • Current methods often lack unambiguous results for nonorthogonal processes.

Purpose of the Study:

  • To experimentally demonstrate unambiguous deterministic quantum process discrimination.
  • To show the feasibility of discriminating nonorthogonal quantum processes.
  • To explore methods utilizing entanglement, known unitaries, and classical communication.

Main Methods:

  • Utilizing properties of quantum entanglement for process discrimination.
  • Employing additional known unitary operations.
  • Leveraging classical communication channels.
  • Performing single-qubit measurements and applying unitary processes on photons.
  • Implementing multipartite unitaries acting nonseparably across distant locations.

Main Results:

  • Achieved unambiguous deterministic discrimination of nonorthogonal quantum processes.
  • Demonstrated successful discrimination using entanglement, known unitaries, and classical communication.
  • Attained a confidence level of greater than or equal to 97% for all tested processes.
  • Successfully discriminated single-qubit and multipartite unitary processes on photons.

Conclusions:

  • Quantum process discrimination of nonorthogonal processes is experimentally achievable.
  • Entanglement, known unitaries, and classical communication are effective tools for this task.
  • The developed methods offer high confidence and broad applicability in quantum information science.