Magnetically tuned, robust and efficient filtering system for spatially multimode quantum memory in warm atomic vapors

Abstract

Warm atomic vapor quantum memories are simple and robust, yet suffer from a number of parasitic processes which produce excess noise. For operating in a single-photon regime precise filtering of the output light is essential. Here we report a combination of magnetically tuned absorption and Faraday filters, both light-direction-insensitive, which stop the driving lasers and attenuate spurious fluorescence and four-wave mixing while transmitting narrowband Stokes and anti-Stokes photons generated in write-in and readout processes. We characterize both filters with respect to adjustable working parameters. We demonstrate a significant increase in the signal to noise ratio upon applying the filters seen qualitatively in measurements of correlation between the Raman-scattered photons.

9 pages, 12 figures

References in corpus (21)

• The Quantum Internet
• Quantum Storage of Photonic Entanglement in a Crystal
• Efficient and long-lived quantum memory with cold atoms inside a ring cavity
• Generation of spatially broadband twin beams for quantum imaging
• Unconditional Room Temperature Quantum Memory
• Multimode Memories in Atomic Ensembles
• Interfacing GHz-bandwidth heralded single photons with a room-temperature Raman quantum memory
• A reversible optical memory for twisted photons
• Collisional decoherence during writing and reading quantum states
• Shot-by-shot imaging of Hong-Ou-Mandel interference with an intensified sCMOS camera
• Efficient spatially-resolved multimode quantum memory
• Temporally multiplexed storage of images in a Gradient Echo Memory
• Interference and nonlinear properties of four-wave-mixing resonances in thermal vapor: Analytical results and experimental verification
• Hamiltonian design in readout from room-temperature Raman atomic memory
• Generation and delayed retrieval of spatially multimode Raman scattering in warm rubidium vapors
• Atomic filtering for hybrid continuous-variable/discrete-variable quantum optics
• Storage of orbital angular momenta of light via coherent population oscillation
• Photon counts statistics of squeezed and multi-mode thermal states of light on multiplexed on-off detectors
• A Simple and Efficient Absorption Filter for Single Photons from a Cold Atom Quantum Memory
• Eigenmode description of Raman scattering in atomic vapors in the presence of decoherence
• Spontaneous and parametric processes in warm rubidium vapours

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