Heralded entanglement distribution between two absorptive quantum memories

Understand

Owing to the inevitable loss in communication channels, the distance of entanglement distribution is limited to approximately 100 kilometres on the ground.

• Quantum repeaters can circumvent this problem by using quantum memory and entanglement swapping.
• As the elementary link of a quantum repeater, the heralded distribution of two-party entanglement between two remote nodes has only been realized with built-in-type quantum memories.
• These schemes suffer from the trade-off between multiplexing capacity and deterministic properties and hence hinder the development of efficient quantum repeaters.