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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

All nonclassical correlations can be activated into distillable entanglement.

Marco Piani1, Sevag Gharibian, Gerardo Adesso

  • 1Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Canada.

Physical Review Letters
|June 28, 2011
PubMed
Summary

We developed a protocol where quantum correlations create bipartite entanglement. The relative entropy of quantumness quantifies this, showing mixed states maximize nonclassicality for entanglement distillation.

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Area of Science:

  • Quantum Information Science
  • Quantum Correlations
  • Entanglement Theory

Background:

  • Nonclassical correlations are fundamental to quantum mechanics.
  • Quantifying and utilizing these correlations for practical tasks like entanglement generation remains a key challenge.
  • The role of mixed states in nonclassicality is not fully understood.

Purpose of the Study:

  • To devise a protocol where general nonclassical multipartite correlations yield a physically relevant effect.
  • To establish an operational interpretation for the relative entropy of quantumness.
  • To explore the role of state mixedness in maximizing nonclassicality and entanglement distillation.

Main Methods:

  • Development of a novel protocol utilizing multipartite quantum correlations.
  • Application of the relative entropy of quantumness as a measure of nonclassical correlations.
  • Analysis of entanglement distillation from mixed entangled states using local ancillae.

Main Results:

  • Demonstrated that nonclassical multipartite correlations can directly produce bipartite entanglement.
  • Showed the equivalence between the relative entropy of quantumness and minimum distillable entanglement.
  • Highlighted that mixed entangled states can exhibit significantly higher nonclassicality than pure or separable states.

Conclusions:

  • The relative entropy of quantumness provides an operational measure for entanglement distillation.
  • State mixedness is crucial for maximizing nonclassical correlations and their utility.
  • This work offers a new perspective on harnessing nonclassical correlations for quantum information processing.