Quantum hologram of macroscopically entangled light via the mechanism of diffuse light storage

TL;DR

This paper proposes a quantum memory scheme that uses diffuse light storage in disordered atomic gases to create a quantum hologram of entangled light, enabling long-term storage and potential quantum information processing.

Contribution

It introduces a novel quantum memory method combining diffuse light trapping with stimulated Raman conversion in disordered gases for entangled state storage.

Findings

Successful mapping of entangled light onto atomic spins

Potential for long-lived quantum holograms

Applicability to macroscopic Bell states

Abstract

In the present paper we consider a quantum memory scheme for light diffusely propagating through a spatially disordered atomic gas. The diffuse trapping of the signal light pulse can be naturally integrated with the mechanism of stimulated Raman conversion into a long-lived spin coherence. Then the quantum state of the light can be mapped onto the disordered atomic spin subsystem and can be stored in it for a relatively long time. The proposed memory scheme can be applicable for storage of the macroscopic analog of the $\Psi^{(-)}$ Bell state and the prepared entangled atomic state performs its quantum hologram, which suggests the possibility of further quantum information processing.