High Efficiency Raman Memory by Suppressing Radiation Trapping

Abstract

Raman interactions in alkali vapours are used in applications such as atomic clocks, optical signal processing, generation of squeezed light and Raman quantum memories for temporal multiplexing. To achieve a strong interaction the alkali ensemble needs both a large optical depth and a high level of spin-polarisation. We implement a technique known as quenching using a molecular buffer gas which allows near-perfect spin-polarisation of over $99.5\%$ in caesium vapour at high optical depths of up to $\sim 2\times 10^5$; a factor of 4 higher than can be achieved without quenching. We use this system to explore efficient light storage with high gain in a GHz bandwidth Raman memory.

11 pages, 6 figures

References in corpus (7)

• Universal Approach to Optimal Photon Storage in Atomic Media
• Strong low-frequency quantum correlations from a four-wave mixing amplifier
• Optimal light storage in atomic vapor
• A Cavity-Enhanced Room-Temperature Broadband Raman Memory
• Interfacing GHz-bandwidth heralded single photons with a room-temperature Raman quantum memory
• Optimal light storage with full pulse shape control
• Suppression of the four-wave mixing amplification via Raman absorption

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• Direct Observation of Broadband Nonclassical States in a Room-temperature Light-matter Interface
• Room Temperature Atomic Frequency Comb Memory for Light
• Multiplexed random-access optical memory in warm cesium vapor
• Robustness of intra-atomic frequency comb based quantum memory against fluctuating environment
• Optimizing the Rydberg EIT spectrum in a thermal vapor