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Highly-efficient quantum memory for polarization qubits in a spatially-multiplexed cold atomic ensemble.

Pierre Vernaz-Gris1,2, Kun Huang3,4, Mingtao Cao1

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Researchers developed a highly efficient quantum memory for polarization qubits, achieving over 99% fidelity and 68% retrieval efficiency. This breakthrough advances quantum information processing and networks.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Quantum memory is crucial for quantum information applications.
  • Efficient storage and retrieval of optical qubits remain a challenge.
  • Existing quantum memories for qubits have limited efficiency.

Purpose of the Study:

  • To develop a quantum memory with high fidelity and efficiency for polarization qubits.
  • To demonstrate a reversible qubit mapping with high information retrieval.
  • To overcome limitations in current quantum memory technologies.

Main Methods:

  • Utilized electromagnetically-induced transparency (EIT) in laser-cooled cesium atoms.
  • Employed spatially multiplexed dual-rail storage for qubits encoded in weak coherent states.
  • Maintained high optical depth across both storage rails.

Main Results:

  • Achieved an average conditional fidelity above 99% for stored polarization qubits.
  • Demonstrated a storage and retrieval efficiency of approximately 68%.
  • Showcased reversible qubit mapping with more retrieved than lost information.

Conclusions:

  • The developed quantum memory offers unprecedented efficiency and fidelity for optical qubits.
  • This technology serves as an efficient node for quantum networks and photonic circuits.
  • The method successfully balances multiplexing with high storage efficiency.