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Scalable and Modular Generation of W-State Entanglements via Memory-Enhanced Fusion.

Jixuan Shi1, Sheng Zhang1, Yukai Wu1,2

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|October 25, 2025
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Summary
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Researchers demonstrate scalable creation of large quantum entangled states using memory-enhanced fusion. This breakthrough advances distributed quantum information processing by connecting smaller entangled states efficiently.

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Area of Science:

  • Quantum Information Processing
  • Quantum Optics
  • Atomic Physics

Background:

  • Generating large-scale multipartite entangled states is crucial for quantum information processing.
  • Scaling up entanglement generation requires modular approaches to connect smaller states.

Purpose of the Study:

  • To achieve scalable and modular generation of large-scale multipartite entangled states.
  • To demonstrate a method for connecting smaller entangled states into a larger, shared state.

Main Methods:

  • Implemented memory-enhanced fusion of two tripartite W-state entanglements using photonic interconnects.
  • Utilized asynchronous preparation in spatially separated atomic quantum memories.
  • Employed on-demand fusion via single-photon interference.

Main Results:

  • Successfully created a heralded four-partite W-state entanglement shared across two remote quantum memory modules.
  • Demonstrated memory-enhanced scaling in entanglement fusion efficiencies.
  • Showcased a modular approach to building larger entangled states.

Conclusions:

  • The demonstrated memory-enhanced fusion provides a scalable pathway for generating large multipartite entangled states.
  • This method paves the way for large-scale distributed quantum information processing.
  • The modular approach is key to overcoming current limitations in system size.