Characterization of EIT-based continuous variable quantum memories

TL;DR

This paper models and analyzes EIT-based quantum memories for continuous variable light fields, considering realistic noise and decoherence, and identifies parameters for quantum-limited operation.

Contribution

It provides a comprehensive multi-modal quantum model of EIT memories including noise effects and benchmarks their quantum performance.

Findings

Numerical simulations of storage and retrieval processes.

Analytical insights into noise and decoherence effects.

Parameters identified for surpassing the quantum limit.

Abstract

We present a quantum multi-modal treatment describing Electromagnetically Induced Transparency (EIT) as a mechanism for storing continuous variable quantum information in light fields. Taking into account the atomic noise and decoherences of realistic experiments, we model numerically the propagation, storage, and readout of signals contained in the sideband amplitude and phase quadratures of a light pulse. An analytical treatment of the effects predicted by this more sophisticated model is then presented. Finally, we use quantum information benchmarks to examine the properties of the EIT-based memory and show the parameters needed to operate beyond the quantum limit.