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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Simultaneous Trapping of Two Optical Pulses in an Atomic Ensemble as Stationary Light Pulses

U-Shin Kim, Yoon-Ho Kim

Published Aug 4, 2024• 0 citations
Publisher

Abstract

We observe the simultaneous trapping of two optical pulses in an atomic ensemble as stationary light pulses. The release efficiency is measured as 1.22 μs, which corresponds to an effective Q-factor of 2.9×109. © 2024 The Author(s)
DOI
10.1109/cleo-pr60912.2024.10676910

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Simultaneous Trapping of Two Optical Pulses in an Atomic Ensemble as Stationary Light Pulses

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The stationary light pulse (SLP) refers to a zero-group-velocity optical pulse in an atomic ensemble prepared by two counter-propagating driving fields. Despite the uniqueness of an optical pulse trapped within an atomic medium without a cavity, observations of SLP so far have been limited to trapping a single optical pulse due to the stringent SLP phase-matching condition, and this has severely hindered the development of SLP-based applications. Here, we first show theoretically that the SLP process in fact supports two phase-matching conditions and we then utilize the result to experimentally demonstrate simultaneous SLP trapping of two optical pulses for the duration from0.8 μs0.8\ \mu \mathsf{s}0.8 μsto2.0 μs2.0\ \mu \mathsf{s}2.0 μs. The characteristic dissipation time, obtained by the release efficiency measurement, is1.22 μs1.22\ \mu \mathsf{s}1.22 μs, which corresponds to an effective Q-factor of2.9×1092.9\times 10^{9}2.9×109[1]. As our SLP system reports a large effective N-atom cooperativity of8×1068\times 10^{6}8×106, our work is expected to bring forth interesting SLP-based applications, such as, efficient photon-photon interaction, spatially multi-mode coherent quantum memory, creation of exotic photonic gas states, etc.
The stationary light pulse (SLP) refers to a zero-group-velocity optical pulse in an atomic ensemble prepared by two counterpropagating driving fields. Despite the uniqueness of an optical pulse trapped within an atomic medium without a cavity, observations of SLP so far have been limited to trapping a single optical pulse due to the stringent SLP phase-matching condition, and this has severely hindered the development of SLP-based applications. In this Letter, we first show theoretically that the SLP process in fact supports two phase-matching conditions and we then utilize the result to experimentally demonstrate simultaneous SLP trapping of two optical pulses for the duration from 0.8 to 2.0 μs. The characteristic dissipation time, obtained by the release efficiency measurement from the SLP trapping state, is 1.22 μs, which corresponds to an effective Q factor of 2.9×10^{9}. Our Letter is expected to bring forth interesting SLP-based applications, such as, efficient photon-photon interaction, spatially multimode coherent quantum memory, creation of exotic photonic gas states, etc.
We present a detailed theoretical description of the generation of stationary light pulses by standing wave electromagnetically induced transparency in media comprised of stationary atoms. We show that, contrary to thermal gas media, the achievable storage times are limited only by the ground state dephasing rate of the atoms, making such media ideally suited for nonlinear optical interactions between stored pulses. Furthermore, we find significant quantitative and qualitative differences between the two types of media, which are important for quantum information processing schemes involving stationary light pulses.
We present a detailed theoretical description of the generation of stationary light pulses by standing-wave electromagnetically induced transparency in media comprised of stationary atoms such as ultracold gasses and solids. We show that, contrary to thermal gas media, the achievable storage times are limited only by the ground state dephasing rate of the atoms, making such media ideally suited for nonlinear optical interactions between stored pulses. Furthermore, we find significant quantitative and qualitative differences between the two types of media, which are important for quantum-information processing schemes involving stationary light pulses.