Entanglement between Lowly and Highly Lying Atomic Spin Waves

Understand

Establishing a quantum interface between different physical systems is of special importance for developing the practical versatile quantum networks.

• Entanglement between low- and high-lying atomic spin waves is essential for building up Rydberg-based quantum information engineering, otherwhile be more helpful to study the dynamics behavior of entanglement under external pertur- bations.
• Here, we report on the successful storage of a single photon as a high-lying atomic spin wave in quantum regime.
• Via storing a K-vector entanglement between single photon and lowly lying spin wave, we thereby experimentally realize the entanglement between low- and high-lying atomic spin waves in two separated atomic systems.