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Entangling Two Rydberg Superatoms via Single-Photon Interference.

Chao-Wei Yang1, Jun Li1, Peng-Fei Sun1

  • 1University of Science and Technology of China, University of Science and Technology of China, University of Science and Technology of China, Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, Hefei 230026, China, CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China, and Hefei National Laboratory, Hefei 230088, China.

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Researchers achieved remote entanglement between two Rydberg superatoms using single-photon interference. This method avoids noise issues, paving the way for high-rate entanglement in quantum networks.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Remote entanglement of matter qubits is crucial for quantum networks and repeaters.
  • Rydberg superatoms offer enhanced atom-photon coupling and nonlinearity for quantum applications.

Purpose of the Study:

  • To experimentally demonstrate remote entanglement between two Rydberg superatoms.
  • To utilize single-photon interference as the mechanism for entanglement generation.
  • To overcome limitations of existing entanglement schemes, such as high-order excitation noise.

Main Methods:

  • Generating collective excitations in atomic ensembles to create Rydberg superatoms.
  • Employing single-photon interference to link two spatially separated Rydberg superatoms.
  • Using independent control lasers for each setup, separated by 3 meters and connected via 20-meter fibers.

Main Results:

  • Successfully realized remote entanglement between two Rydberg superatoms.
  • Verified that the generated entanglement is free from high-order excitation noise.
  • Demonstrated a novel approach for entangling distant quantum systems.

Conclusions:

  • The single-photon interference method provides a viable route for high-fidelity remote entanglement of Rydberg superatoms.
  • This work addresses a key drawback in traditional entanglement schemes, improving scalability for quantum networks.
  • The findings pave the way for high-rate entanglement of long-distance separated Rydberg superatoms.