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Long-lived light storage in a room temperature atomic vapor based on coherent population oscillations

Marie-Aude Maynard, Fabien Bretenaker, Fabienne Goldfarb

Published Jun 14, 2014• 0 citations
OpenAlex

Abstract

We report the experimental observation of Coherent Population Oscillation (CPO) based light storage in an atomic vapor cell at room temperature. Using the ultranarrow CPO between the ground levels of a $\Lambda$ system selected by polarization in metastable $^4$He, such a light storage is experimentally shown to be phase preserving. As it does not involve any atomic coherences it has the advantage of being robust to dephasing effects such as small magnetic field inhomogeneities. The storage time is limited by the population lifetime of the ground states of the $\Lambda$ system.

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We report the experimental observation of Coherent Population Oscillation (CPO) based light storage in an atomic vapor cell at room temperature. Using the ultranarrow CPO between the ground levels of a Λ\LambdaΛ system selected by polarization in metastable 4^44He, such a light storage is experimentally shown to be phase preserving. As it does not involve any atomic coherences it has the advantage of being robust to dephasing effects such as small magnetic field inhomogeneities. The storage time is limited by the population lifetime of the ground states of the Λ\LambdaΛ system.
We report the experimental observation of coherent population oscillation (CPO-) based light storage in an atomic vapor cell at room temperature. Using the ultranarrow CPO between the ground levels of a $\ensuremath{\Lambda}$ system selected by polarization in metastable 4He^{4}\mathrm{He}4He, such a light storage is experimentally shown to be phase preserving. As it does not involve any atomic coherences it has the advantage of being robust to dephasing effects such as small magnetic field inhomogeneities. The storage time is limited by the population lifetime of the ground states of the $\ensuremath{\Lambda}$ system.
We report on the storage of light via the phenomenon of coherent population oscillation (CPO) in an atomic cesium vapor at room temperature. In the experiment the optical information of a probe field is stored in the CPO of two ground states of a $\ensuremath{\Lambda}$ three-level system formed by the Zeeman sublevels of the hyperfine transition $F=3\ensuremath{\rightarrow}{F}^{\ensuremath{'}}=2$ of the cesium D2{D}_{2}D2​ line. We show directly that this CPO-based memory is very insensitive to stray magnetic field inhomogeneities and presents a lifetime which is limited mainly by atomic motion. A theoretical simulation of the measured spectra was also developed and is in very good agreement with the experiment.
We study the propagation and storage of a quantum field using ultranarrow coherent population oscillations (CPOs) in a $\mathrm{\ensuremath{\Lambda}}$-type atomic medium. The predictions for classical fields are checked experimentally in a vapor at room temperature. We derive the evolution of its squeezing spectrum in the presence of a large classical pump field which enables CPOs to exist. We show that the spontaneous emission of the residual population pumped into the excited state progressively destroys the quantum noise properties of the quantum field along propagation. The output quantum field therefore tends to be a coherent state, discarding the possibility to store quantum states of light with CPO.
We theoretically study the propagation and storage of a classical field in a Λ-type atomic medium using coherent population oscillations (CPOs). We show that the propagation eigenmodes strongly relate to the different CPO modes of the system. Light storage in such modes is discussed by introducing a "populariton" quantity, a mixture of populations and field, by analogy to the dark state polariton used in the context of electromagnetically induced transparency light storage protocol. As experimentally shown, this memory relies on populations and is then-by contrast with usual Raman coherence optical storage protocols-robust to dephasing effects.
It is well known that ultranarrow electromagnetically induced transparency (EIT) resonances can be observed in atomic gases at room temperature. We report here the experimental observation of another type of ultranarrow resonance, as narrow as the EIT ones, in a $\ensuremath{\Lambda}$ system selected by light polarization in metastable 4{}^{4}4He at room temperature. It is shown to be due to coherent population oscillations in an open two-level system (TLS). For perpendicular linearly polarized coupling and probe beams, this system can be considered as two coupled open TLSs, in which the ground-state populations exhibit antiphase oscillations. We also predict theoretically that in the case of two parallel polarizations, the system would behave like a closed TLS, and the narrow resonance associated with these oscillations would disappear.