English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this thesis, after a brief review of some concepts of Quantum Optics, weanalyze a three-level atomic system in the conditions of electromagneticallyinduced transparency (EIT), and we investigate the propagation of a gaussianpulse along a cigar-shaped cloud of both cold and hot atoms in EIT regime. Inparticular, we show that it is possible to amplify a slow propagating pulsewithout population inversion. We also analyze the regime of anomalous lightpropagation showing that it is possible to observe superluminal energypropagation. In these conditions, it is possible to imprint reversibly('write') the information carried by the photons onto the atoms, specificallyas a coherent pattern of atomic spins, and later the information stored in theatomic spins can be transferred back ('read') to the light field, implementingin this way a quantum memory. Besides, we analyze the propagation of a quantumfield in an EIT medium sustaining dark state polaritons (DSP) in aquasi-particle picture. Here, the decoherence effects in this quantum memoryfor photons, by analyzing the fidelity of the quantum state transfer, and theemergence of parastatistics in the quasi-particle picture in gain medium arediscussed. Finally, we introduce a polarization quantum memory for photons byusing a tripod atomic configuration in which two ideal EIT windows appear andthe two DSPs, scattering each other, show a solitonic behavior.

Storing Quantum Information via Atomic Dark Resonances