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Multipartite entanglement detection via structure factors.

Philipp Krammer1, Hermann Kampermann, Dagmar Bruss

  • 1Faculty of Physics, University of Vienna, A-1090 Vienna, Austria.

Physical Review Letters
|October 2, 2009
PubMed
Summary
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We found a link between quantum entanglement in many-body systems and their diffraction patterns using structure factors. This allows for creating new entanglement witnesses for quantum information science.

Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Quantum entanglement is a key resource in quantum information.
  • Diffractive properties of many-body systems are experimentally accessible.

Purpose of the Study:

  • To establish a relationship between entanglement and diffractive properties.
  • To develop general analytical constructions for multiqubit entanglement witnesses.

Main Methods:

  • Utilizing structure factors as the link between entanglement and diffraction.
  • Developing entanglement witnesses based on two-point correlations.
  • Analyzing properties of detected states and witness robustness against noise.

Main Results:

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  • A direct relation between many-body entanglement and diffractive properties is established.
  • General analytical constructions for multiqubit entanglement witnesses are provided.
  • Witnesses based on two-point correlations are shown to be effective and robust.

Conclusions:

  • Diffractive properties offer a novel pathway to quantify and detect quantum entanglement.
  • The developed entanglement witnesses are versatile and applicable to various physical systems.
  • The findings advance the understanding and manipulation of entanglement in complex quantum systems.