Raman Quantum Memory of Photonic Polarised Entanglement

TL;DR

This paper demonstrates two types of Raman quantum memories capable of storing photonic polarised entanglement, advancing quantum network capabilities with high-speed, broadband properties.

Contribution

It introduces two novel Raman quantum memory implementations for photonic entanglement, addressing previous challenges in storing polarised entangled states.

Findings

Successful storage of hybrid entanglement of path and polarization.

Effective Raman storage of two-particle photonic entangled states.

Promising performance metrics for quantum information applications.

Abstract

Quantum entanglement of particles is regarded as a fundamental character in quantum information, in which quantum state should be given for whole system instead of independently describing single particle. Constructing quantum memory of photonic entanglement is essential for realizing quantum networks, which had been performed previously by many memory protocols. Of which Raman quantum memory gives advantages in broadband and high-speed properties, resulting in huge potential in quantum network and quantum computation. However, Raman quantum memory of photonic polarised entanglement is a challenge work and still missing. Here, we report two Raman quantum memories based on gas atomic ensembles: 1. Heralded Raman quantum memory of hybrid entanglement of path and polarization of single photon. 2. Raman storage of two-particle photonic polarised entangled state. Our experimental performances of these two different Raman quantum storages of photonic entanglement show a very promising prospective in quantum information science.