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Network Quantum Steering.

Benjamin D M Jones1,2,3, Ivan Šupić3,4, Roope Uola3

  • 1H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom.

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Researchers explored network steering in quantum networks with independent sources. They demonstrated a novel effect where unsteerable states can exhibit network steering, while also showing limitations via network local hidden state models.

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Area of Science:

  • Quantum Information Science
  • Foundations of Quantum Mechanics

Background:

  • Large-scale quantum networks offer technological advancements and insights into quantum foundations like nonlocality.
  • Independent sources in quantum networks lead to network nonlocality, even with fixed measurements.

Purpose of the Study:

  • Introduce network steering and network local hidden state (NLHS) models for independent sources in quantum networks.
  • Investigate the demonstration and limitations of network steering.

Main Methods:

  • Leveraging concepts from Bell nonlocality and quantum steering.
  • Utilizing entanglement swapping to activate network steering.
  • Constructing NLHS models to identify limitations.

Main Results:

  • Demonstrated network steering using established Bell nonlocality and quantum steering results.
  • Showcased a novel network steering effect with unsteerable states via entanglement swapping.
  • Provided no-go results for network steering in certain scenarios by constructing NLHS models.

Conclusions:

  • Network steering is a distinct phenomenon from Bell nonlocality and quantum steering.
  • Entanglement swapping can activate network steering in previously unsteerable states.
  • NLHS models delineate the boundaries of network steering in independent-source quantum networks.