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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Opening up three quantum boxes causes classically undetectable wavefunction collapse.

Richard E George1, Lucio M Robledo, Owen J E Maroney

  • 1Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom. ucanrge@live.ucl.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|February 16, 2013
PubMed
Summary
This summary is machine-generated.

This study uses a quantum game with nitrogen vacancy centers to show quantum mechanics predictions differ from classical ones. The experiment rules out classical models, demonstrating quantum noncontextuality without measurement disturbance.

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Area of Science:

  • Quantum Mechanics
  • Quantum Information Science
  • Experimental Physics

Background:

  • Quantum measurements can disturb systems, often explained by quantum back-action adding noise to classical signals.
  • The "three-box" quantum game provides a framework to test quantum mechanics against classical predictions.
  • Nitrogen vacancy centers in diamond offer sophisticated quantum control and measurement capabilities.

Purpose of the Study:

  • To experimentally implement the "three-box" quantum game using nitrogen vacancy centers.
  • To investigate scenarios where quantum measurement back-action does not disturb the classical description.
  • To test quantum noncontextuality and exclude classical explanations for observed phenomena.

Main Methods:

  • Utilized state-of-the-art control and measurement of a nitrogen vacancy center in diamond.
  • Implemented the "three-box" quantum game protocol.
  • Quantified residual measurement disturbance and compared experimental results with quantum and classical predictions.

Main Results:

  • Quantum and classical mechanics made contradictory predictions for the experimental procedure.
  • Measurement-induced disturbance could not explain the discrepancy from a classical perspective.
  • Data ruled out classical models by over 7.8 standard deviations.
  • Excluded macroscopic state definiteness from the system.

Conclusions:

  • The experiment successfully tested quantum noncontextuality, addressing the measurement detectability loophole.
  • Demonstrated a quantum system where measurement back-action does not mask quantum effects.
  • Provided strong evidence against classical explanations for quantum phenomena in this context.