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Autonomous Distribution of Programmable Multiqubit Entanglement in a Dual-Rail Quantum Network.

J Agustí1,2,3, X H H Zhang1,2,3, Y Minoguchi4

  • 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany.

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We present a scalable method to create distributed multiqubit entangled states using waveguide quantum electrodynamics (QED). This technique enables efficient entanglement distribution across quantum networks without complex pulse control.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Communication

Background:

  • Preparing and distributing multiqubit entangled states is crucial for advancing quantum networks and quantum computing.
  • Existing methods often require precise control and multiple entanglement sources, limiting scalability.

Purpose of the Study:

  • To propose and analyze a scalable, autonomous scheme for generating spatially distributed multiqubit entangled states.
  • To enable efficient distribution of multipartite entangled states across large quantum networks.

Main Methods:

  • Utilizing a dual-rail waveguide quantum electrodynamics (QED) setup.
  • Employing correlated photons from a nondegenerate parametric amplifier to illuminate qubit arrays.
  • Adjusting local qubit-photon detunings to control the degree of multipartite entanglement.

Main Results:

  • The scheme generates different classes of pure entangled steady states.
  • Preparation time scales at most linearly with system size in numerical simulations.
  • Potential for speedup with increased amplifier bandwidth.

Conclusions:

  • This autonomous scheme provides a novel route for distributing ready-to-use multipartite entangled states.
  • It bypasses the need for precise pulse control and relies on a single entanglement source.
  • The method is suitable for building large-scale quantum networks.