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Efficient entanglement of three remote single-atom quantum-network nodes

Matthias Seubert, Leonardo Ruscio

Featured July 4, 2026

Original Paper

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Simply

Connecting three quantum computers far apart is super hard, but this paper shows a clever way to link three tiny atom-based quantum memories together very efficiently, creating a super-connected quantum state that lasts a long time.

In depth
The study demonstrates the efficient generation, distribution, and storage of a three-qubit entangled state across three independent laboratories, each housing a single atom coupled to an optical resonator. The authors achieve this by sequentially entangling the atoms pairwise using two distinct heralded techniques: photonic entanglement swapping and heralded state transfer into a memory node, resulting in an unprecedented entanglement generation efficiency for a three-node network.

Key Takeaways

  • 1
    The paper achieves three-qubit entanglement across remote single-atom nodes with an unprecedented efficiency of 0.16% and a nominal rate of ~10/s.
  • 2
    The authors demonstrate a sequential entanglement protocol combining heralded photonic entanglement swapping and heralded state transfer to build the three-node Greenberger-Horne-Zeilinger (GHZ) state.
  • 3
    The generated GHZ state exhibits a high entanglement fidelity of 77(1)% and a lifetime exceeding 200 µs, while violating Mermin’s inequality and closing the detection loophole.

Conceptual Flow

HIGH LEVEL
1
Methodology: Building a Three-Node Quantum Link

The scientists connected three quantum memory stations by sending special light particles between them, one link at a time, to make them all 'talk' to each other.

Central Memory
End Memory A
End Memory B
Connect with Light
Three Linked Memories
2
Results: Stronger, Faster Quantum Connections

They made the connections much stronger and faster than before, proving the linked memories were truly 'tangled' and could hold their special connection for a useful amount of time.

Old Connection Speed
Old Connection Strength
New Way of Linking
Much Faster Speed
Much Stronger Link
Longer Lasting Link