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Rephasing efficiency of sequences of phased pulses in spin-echo and light-storage experiments
摘要： We investigate the rephasing efficiency of sequences of phased pulses for spin echoes and light storage by electromagnetically induced transparency (EIT). We derive a simple theoretical model and show that the rephasing efficiency is very sensitive to the phases of the imperfect rephasing pulses. The obtained efficiency differs substantially for spin echoes and EIT light storage, which is due to the spatially retarded coherence phases after EIT light storage. Similar behavior is also expected for other light-storage protocols with spatial retardation or for rephasing of collective quantum states with an unknown or undefined phase, e.g., as relevant in single-photon storage. We confirm the predictions of our theoretical model by experiments in a Pr3+:Y2SiO5 crystal.
关键词： phased pulses,rephasing efficiency,electromagnetically induced transparency,light storage,EIT,spin echoes,Pr3+:Y2SiO5 crystal
更新于2025-09-23 15:23:52
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Formation of a Stationary Light Pulse in a Doppler-Broadened EIT Medium
摘要： A number of experiments have been performed on light slowing and stopping in the electromagnetically induced transparency (EIT) media of hot atomic gases where the Doppler-shift may add detunings to the field frequencies in an inhomogeneous fashion. We provide here a theoretical analysis as to the effect of such a Doppler-broadened environment on the dynamics of the system in comparison to a cold atomic medium. We will show that one of the most critical factors in the formation of a stationary light pulse is the enhancement of the excited-state decay rate caused by the collisions between the atoms of the medium and the molecules of the buffer gas.
关键词： Light Slowing,Light Storage,Doppler-broadened environment,SLP,EIT medium
更新于2025-09-09 09:28:46