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A universal quantum information processor for scalable quantum communication and networks.

Xihua Yang1, Bolin Xue1, Junxiang Zhang2

  • 1Department of Physics, Shanghai University, Shanghai 200444, China.

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Summary
This summary is machine-generated.

This study proposes a universal quantum information processor using atomic coherence. It efficiently generates and manipulates multipartite entanglement for quantum networks and communication.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Atomic Physics

Background:

  • Multipartite entanglement is crucial for quantum computation, communication, and networks.
  • Efficient generation, distribution, and control of entanglement are essential for practical quantum information processing.

Purpose of the Study:

  • To present a theoretical proposal for a universal quantum information processor (QIP).
  • To achieve efficient and convenient manipulation of multipartite entanglement using atomic coherence.

Main Methods:

  • Utilizing atomic coherence generated via electromagnetically induced transparency (EIT) in a Λ-type atomic configuration.
  • Employing EIT-based nondegenerate four-wave mixing processes.
  • Using only coherent light fields for deterministic entanglement operations.

Main Results:

  • Demonstrated that atomic coherence can function as a universal QIP with capabilities of a quantum beam splitter, frequency converter, entangler, and repeater.
  • Showcased efficient and flexible generation, exchange, distribution, and manipulation of light-light, atom-light, and atom-atom multipartite entanglement.
  • Achieved deterministic entanglement operations using only coherent light fields.

Conclusions:

  • The proposed EIT-based method offers a convenient and efficient way to realize a universal QIP.
  • This approach significantly facilitates quantum information processing operations.
  • Holds promising applications for scalable quantum communication and quantum networks.