Reversible Quantum Interface for Tunable Single-sideband Modulation

TL;DR

This paper demonstrates a reversible quantum interface using EIT in Cesium vapor that allows for noise-free, tunable single-sideband and dual-sideband quantum state storage and retrieval.

Contribution

It introduces a method for storing and reading out non-commuting light variables with no added noise, including tunable single-sideband and dual-sideband configurations.

Findings

Successful storage and retrieval of quantum states without noise.

Comparison of single-sideband and dual-sideband storage methods.

Demonstration of tunable, reversible quantum state mapping.

Abstract

Using Electromagnetically Induced Transparency (EIT) in a Cesium vapor, we demonstrate experimentally that the quantum state of a light beam can be mapped into the long lived Zeeman coherences of an atomic ground state. Two non-commuting variables carried by light are simultaneously stored and subsequentely read-out, with no noise added. We compare the case where a tunable single sideband is stored independently of the other one to the case where the two symmetrical sidebands are stored using the same EIT transparency window.