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Entanglement between light and an optical atomic excitation.

L Li1, Y O Dudin, A Kuzmich

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.

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Researchers created entanglement between light and atoms using Rydberg states in an optical lattice. This breakthrough enables faster, more reliable quantum networks with many nodes for quantum logic operations.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Entanglement generation and distribution are key goals for quantum networks.
  • Previous methods using spontaneous emission are probabilistic and slow, limiting networks to two nodes.
  • Atom-photon entanglement protocols are improved by optical cavities or Rydberg states.

Purpose of the Study:

  • To report the generation of entanglement between light fields and atoms in Rydberg states.
  • To overcome limitations of probabilistic entanglement generation for scalable quantum networks.

Main Methods:

  • Utilizing an ultracold atomic gas confined in an optical lattice.
  • Employing state-insensitive confinement for both ground and Rydberg atomic states.
  • Inhibiting dephasing of optical atomic coherence.

Main Results:

  • Successfully generated entanglement between light fields and atoms in Rydberg states.
  • Demonstrated state-insensitive confinement in an optical lattice, protecting atomic coherence.
  • Overcame probabilistic nature of spontaneous emission for faster entanglement generation.

Conclusions:

  • The developed method enables functional, many-node quantum networks.
  • Paves the way for deterministic quantum logic operations between atomic memories.
  • Advances the development of scalable and robust quantum communication and computation infrastructure.