Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Spatially multimode Raman scattering: Optical memory and new, direct method for measuring diffusion

Radosław Chrapkiewicz, Wojciech Wasilewski

Published May 1, 2013• 0 citations
Publisher

Abstract

Here we present results of measuring spatially multimode collective Raman scattering in warm Rubidium vapors. It is the first to our knowledge generation, storing and retrieval of spatially multimode light in such process. We also suggest a new, direct method of measuring diffusion coefficients by measuring decoherence of collective excitations in the dark.

DOI
10.1109/cleoe-iqec.2013.6801654

Related papers

Generation and delayed retrieval of spatially multimode Raman scattering in warm rubidium vapors

Radosław Chrapkiewicz, Wojciech Wasilewski

We apply collective Raman scattering to create, store and retrieve spatially multimode light in warm rubidium-87 vapors. The light is created in a spontaneous Stokes scattering process. This is accompanied by the creation of counterpart collective excitations in the atomic ensemble - the spin waves. After a certain storage time we coherently convert the spin waves into the light in deterministic anti-Stokes scattering. The whole process can be regarded as a delayed four-wave mixing which produces pairs of correlated, delayed random images. Storage of higher order spatial modes up to microseconds is possible owing to usage of a buffer gas. We study the performance of the Raman scattering, storage and retrieval of collective excitations focusing on spatial effects and the influence of decoherence caused by diffusion of rubidium atoms in different buffer gases. We quantify the number of modes created and retrieved by analyzing statistical correlations of intensity fluctuations between portions of the light scattered in the far field.

arXiv:1405.4404•Optics Express•Dec 19, 2012•28 citations

Multi-Spatial-Mode Optical Memory with Collective Raman Scattering Interface

Radosław Chrapkiewicz, Wojciech Wasilewski

We show that quantum memories can be implemented in atomic ensembles in a multi-spatial-mode regime using collective Raman scattering. It can be accomplished by optimization of diffusional decoherence which we measure by a novel method.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting•Jan 1, 2013•0 citations

Multimode quantum state tomography of slow light in rubidium vapor

Andrew M. C. Dawes, Noah T. Holte, Hunter A. Dassonville

Slow and stopped light systems form an important piece of the photonics puzzle by acting as memory devices. When used with few-photon light levels, these devices are fundamental to applications in quantum information science, quantum computing, and quantum communication. We report on our progress implementing a technique 1 for measuring the quantum state of light that has been stored in a warm-vapor slow-light system. This technique does not require careful mode matching can in fact be used to optimize the measured eld mode without a prior knowledge of the stored light.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Feb 21, 2014•0 citations

Spatially Multimode Holographic Quantum Memory for Single and Multiple Photons Generation

Michał Dąbrowski, Radosław Chrapkiewicz, Wojciech Wasilewski

We experimentally demonstrate μs-lifetime holographic quantum memory capable of intrinsic generation, storage and retrieval up to 60 photons, based on Raman interaction in warm rubidium-87 vapors. Such a multimode memory could practically enhance rates of single and multiple photons generation.

Conference on Lasers and Electro-Optics•Jan 1, 2017•1 citation

Direct observation of atomic diffusion in warm rubidium ensembles

Michaø ParniakWojciech Wasilewski

We present a robust method for measuring diffusion coefficients of warm atoms in buffer gases. Using optical pumping, we manipulate the atomic spin in a thin cylinder inside the cell. Then, we observe the spatial spread of optically pumped atoms in time using a camera, which allows us to determine the diffusion coefficient. As an example, we demonstrate measurements of diffusion coefficients of rubidium in neon, krypton and xenon acting as buffer gases. We have determined the normalized (273 K, 760 Torr) diffusion coefficients to be 0.18 ± 0.03 cm 2 /s for neon, 0.07 ± 0.01 cm 2 /s for krypton and 0.052 ± 0.006 cm 2 /s for xenon.

•Jan 1, 2014•0 citations

Direct observation of atomic diffusion in warm rubidium ensembles

Michal P. Parniak, Wojciech Wasilewski

We present a robust method for measuring diffusion coefficients of warm atoms in buffer gases. Using optical pumping, we manipulate the atomic spin in a thin cylinder inside the cell. Then, we observe the spatial spread of optically pumped atoms in time using a camera, which allows us to determine the diffusion coefficient. As an example, we demonstrate measurements of diffusion coefficients of rubidium in neon, krypton and xenon acting as buffer gases. We have determined the normalized (273 K, 760 Torr) diffusion coefficients to be 0.18 ± 0.03 cm 2 /s for neon, 0.07 ± 0.01 cm 2 /s for krypton and 0.052 ± 0.006 cm 2 /s for xenon.

arXiv:1308.2528•Applied Physics B•Nov 15, 2013•17 citations
Here we present results of measuring spatially multimode collective Raman scattering in warm Rubidium vapors. It is the first to our knowledge generation, storing and retrieval of spatially multimode light in such process. We also suggest a new, direct method of measuring diffusion coefficients by measuring decoherence of collective excitations in the dark.
We apply collective Raman scattering to create, store and retrieve spatially multimode light in warm rubidium-87 vapors. The light is created in a spontaneous Stokes scattering process. This is accompanied by the creation of counterpart collective excitations in the atomic ensemble - the spin waves. After a certain storage time we coherently convert the spin waves into the light in deterministic anti-Stokes scattering. The whole process can be regarded as a delayed four-wave mixing which produces pairs of correlated, delayed random images. Storage of higher order spatial modes up to microseconds is possible owing to usage of a buffer gas. We study the performance of the Raman scattering, storage and retrieval of collective excitations focusing on spatial effects and the influence of decoherence caused by diffusion of rubidium atoms in different buffer gases. We quantify the number of modes created and retrieved by analyzing statistical correlations of intensity fluctuations between portions of the light scattered in the far field.
Slow and stopped light systems form an important piece of the photonics puzzle by acting as memory devices. When used with few-photon light levels, these devices are fundamental to applications in quantum information science, quantum computing, and quantum communication. We report on our progress implementing a technique 1 for measuring the quantum state of light that has been stored in a warm-vapor slow-light system. This technique does not require careful mode matching can in fact be used to optimize the measured eld mode without a prior knowledge of the stored light.
We present a robust method for measuring diffusion coefficients of warm atoms in buffer gases. Using optical pumping, we manipulate the atomic spin in a thin cylinder inside the cell. Then, we observe the spatial spread of optically pumped atoms in time using a camera, which allows us to determine the diffusion coefficient. As an example, we demonstrate measurements of diffusion coefficients of rubidium in neon, krypton and xenon acting as buffer gases. We have determined the normalized (273 K, 760 Torr) diffusion coefficients to be 0.18 ± 0.03 cm 2 /s for neon, 0.07 ± 0.01 cm 2 /s for krypton and 0.052 ± 0.006 cm 2 /s for xenon.
We present a robust method for measuring diffusion coefficients of warm atoms in buffer gases. Using optical pumping, we manipulate the atomic spin in a thin cylinder inside the cell. Then, we observe the spatial spread of optically pumped atoms in time using a camera, which allows us to determine the diffusion coefficient. As an example, we demonstrate measurements of diffusion coefficients of rubidium in neon, krypton and xenon acting as buffer gases. We have determined the normalized (273 K, 760 Torr) diffusion coefficients to be 0.18 ± 0.03 cm 2 /s for neon, 0.07 ± 0.01 cm 2 /s for krypton and 0.052 ± 0.006 cm 2 /s for xenon.