A reversible optical memory for twisted photons

Abstract

We report on an experiment in which orbital angular momentum of light is mapped at the single-photon level into and out of a cold atomic ensemble. Based on the dynamic electromagnetically-induced transparency protocol, the demonstrated optical memory enables the reversible mapping of Laguerre-gaussian modes with preserved handedness of the helical phase structure. The demonstrated capability opens the possibility to the storage of qubits encoded as superpositions of orbital angular momentum states and to multi-dimensional light-matter interfacing.

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• Quantum memories: emerging applications and recent advances
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• Spatially dependent electromagnetically induced transparency
• Vectorial light-matter interaction -- exploring spatially structured complex light fields
• Azimuthal modulation of electromagnetically induced transparency using structured light
• Optomechanics based on angular momentum exchange between light and matter
• Quantum state tomography of orbital angular momentum photonics qubits via a projection-based technique
• Identifying orbital angular momentum of light in quantum wells
• Storage of orbital angular momenta of light via coherent population oscillation
• Information processing at the speed of light
• Narrow band amplification of light carrying orbital angular momentum
• Magnetically tuned, robust and efficient filtering system for spatially multimode quantum memory in warm atomic vapors
• An Upper Bound on the Rate of Information Transfer in Optical Vortex Beams
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• Storing vector-vortex states of light in intra-atomic frequency comb
• Mechanical memory for photons with orbital angular momentum
• Cavity Optomechanical Quantum Memory for Twisted Photons Using a Ring BEC
• Parallel two-qubit entangling gates via a quantum nondemolition interaction controlled by rotation
• Holographically controlled three-dimensional atomic population patterns