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Semideterministic Entanglement between a Single Photon and an Atomic Ensemble.

Jun Li1, Ming-Ti Zhou1, Chao-Wei Yang1

  • 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

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|November 9, 2019
PubMed
Summary
This summary is machine-generated.

Researchers created high-efficiency atom-photon entanglement using Rydberg blockade, a key step for quantum networks. This method achieves 50% intrinsic efficiency, paving the way for robust quantum repeaters.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Entanglement between single photons and matter qubits is crucial for quantum repeaters and networks.
  • Current methods using atomic ensembles suffer from low entanglement creation probabilities.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel scheme for efficient atom-photon entanglement.
  • To overcome the limitations of low efficiency in existing entanglement generation protocols.

Main Methods:

  • Utilizing Rydberg blockade to generate two collective atomic excitations in distinct internal states.
  • Introducing momentum as a degree of freedom and employing Raman coupling to entangle these excitations.
  • Retrieving one excitation to create entanglement between a single photon's polarization and the remaining atomic excitation's momentum.

Main Results:

  • Achieved a 50% intrinsic efficiency for atom-photon entanglement generation.
  • Measured a high fidelity of 0.901(8) for the created entanglement.
  • Verified the retrieved optical field consists of genuine single photons.

Conclusions:

  • The demonstrated scheme significantly enhances the efficiency of atom-photon entanglement.
  • This high-efficiency, heralded entanglement is suitable for building robust quantum repeaters and networks.
  • The method provides a promising pathway for scalable quantum communication architectures.