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Area of Science:

  • Quantum Optics
  • Quantum Information Science
  • Atomic Physics

Background:

  • Quantum entanglement is a fundamental resource for quantum information processing.
  • Efficient generation of photon-entangled quantum memory is essential for quantum networking.
  • Existing protocols often face limitations in entanglement generation rates and operational complexity.

Purpose of the Study:

  • To demonstrate a novel protocol for in situ generation of multimode photon-memory entanglement.
  • To achieve high-rate bipartite entanglement between optical modes and an atomic ensemble quantum memory.
  • To leverage existing technologies for practical implementation.

Main Methods:

  • Parametric driving of an optical cavity coupled to an atomic ensemble quantum memory.
  • Generation of multimode photon-memory entanglement.
  • Discarding one entangled optical mode to achieve bipartite entanglement.

Main Results:

  • Successful in situ generation of multimode photon-memory entanglement.
  • High-rate bipartite photon-memory entanglement achieved, even after mode discarding.
  • Theoretical entanglement generation rates of tens of MHz demonstrated without fine-tuning.

Conclusions:

  • The proposed scheme offers significant advantages in entanglement generation rates compared to current protocols.
  • The protocol is realizable with existing technologies, including photonic resonators and rare-earth-ion doped quantum memories.
  • This photon-memory entanglement source is a versatile resource for quantum networking and interconnect applications.