Preservation of quantum correlations in femtosecond light pulse train within atomic ensemble

TL;DR

This paper demonstrates the preservation and manipulation of multimode quantum correlations from femtosecond pulse trains within an atomic ensemble quantum memory, enabling advanced quantum information processing.

Contribution

It introduces a method to map and restore multimode quantum correlations in a single atomic cell using non-resonance Raman interaction with SPOPO light.

Findings

Quantum correlations can be preserved during storage and retrieval.

The restored pulse train maintains multimode squeezed supermodes.

Mapping enables manipulation of quantum states within the memory.

Abstract

In this paper, we examined a possibility of preservation of a substantially multimode radiation in a single cell of quantum memory. As a light source we considered a synchronously pumped optical parametric oscillator (SPOPO). As it was shown in [1-4], SPOPO radiation has a large number of the correlated modes making it attractive for the purposes of the quantum communication and computing. We showed that these correlations can be mapped on the longitudinal spin waves of the memory cell and be restored later in the readout light. The efficiencies of the writing and readout depend on the mode structure of the memory determined by a mechanism of the light-matter interaction under consideration (the non-resonance Raman interaction) and by the profile of the driving light field. We showed that like the initial light pulse train, the restored one can be represented by a set of squeezed supermodes. The mapping of the quantum multimode correlations on the material medium offers opportunities to manipulate the quantum states within the memory cell followed by the reading of the transformed state.