Abstract
We provide an entropy analysis for light storage and light retrieval. In this analysis, entropy extraction and reduction in a typical light storage experiment are identified. The spatiotemporal behavior of entropy is presented for D1 transition in cold sodium atoms. The governing equations are the reduced Maxwell field equations and the Liouville–von Neumann equation for the density matrix of the dressed atom.
Highlights
The light storage effect (LSE) has become a powerful technique that offers storing and restoring quantum information [1,2,3,4,5,6,7]
The constructed dynamical entropy for stationary illumination is based on populations of hf levels, as well as the dipole operator
We introduced J0 (ω) with zero eigenvalue to obtain an entropy SRy (Ω, v) associated with the Rayleigh scattered light
Summary
The light storage effect (LSE) has become a powerful technique that offers storing and restoring quantum information [1,2,3,4,5,6,7]. According to electromagnetically-induced transparency (EIT) [26,27,28], LSE is prominent when two fields that have a common excited state interact on different transitions. In order to reveal information about the mutual interaction of EIT pulses, coupling and probe, a delayed pulse in the coupling channel is applied. As the read field propagates, the generated restoring field in the probe channel increases with entropy production. The first (second) V configuration corresponds to the transitions between the excited hyperfine levels and lower (upper) ground hyperfine level
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