Related Experiment Video
Updated: Dec 15, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
Self-amplifying memory based on multiple cascading four-wave mixing via recoil-induced resonance
Abstract:
We report on a new, to the best of our knowledge, type of optical memory that allows for the amplification of the optical signal carrying the stored information during its reading process. The memory mechanism is demonstrated in an ensemble of cold cesium atoms and is based on the multiple parametric four-wave mixing exploring the external atomic degrees of freedom via recoil-induced resonances. We have particularly demonstrated the storage of light carrying orbital angular momentum with a fourfold amplifying factor for the retrieved signal during the reading process. Memory lifetimes of the order of hundreds of microseconds have been measured, and possible applications for this self-amplifying memory are discussed.
Related Concept Videos
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
Amplifying Signals via Enzymatic Cascade
Cascaded Op Amps
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
NMR Spectrometers: Resolution and Error Correction
Sound Waves: Resonance
Atomic Nuclei: Nuclear Relaxation Processes

