A reversible optical memory for twisted photons
L. Veissier (LKB - Jussieu), A. Nicolas (LKB - Jussieu), L. Giner (LKB, - Jussieu), D. Maxein (LKB - Jussieu), A.S. Sheremet (SPBSPU), E. Giacobino, (LKB - Jussieu), J. Laurat (LKB - Jussieu)
TL;DR
This paper demonstrates a reversible optical memory that stores and retrieves twisted photons carrying orbital angular momentum in a cold atomic ensemble, enabling advanced quantum information processing.
Contribution
It introduces a novel method for mapping and preserving the orbital angular momentum of light at the single-photon level using electromagnetically-induced transparency.
Findings
Successful reversible mapping of Laguerre-Gaussian modes
Preservation of the helical phase structure during storage
Potential for quantum information applications
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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