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International Journal of Theoretical Physics

Quantum Control of Atom-Photon Entanglement via Structure Light in a Three-Level Medium

Ali Mehdinejad

Published Jun 1, 2022• 20 citations
Publisher
DOI
10.1007/s10773-022-05148-0

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Abstract In recent years, photon drag has attracted enormous attention owing to both fundamental and practical interests. In this paper, we investigate dragging effect in quantum systems with closed-loop interaction. First, we demonstrate an enhanced photon drag in a moving atomic medium with a three-level Λ-type structure. By incorporating the interference of spontaneous emissions, the properties of the atomic medium can be easily controlled by the relative phase of applied fields so that a large group index along with a transparency or even a gain can be achieved. As the photon drag is proportional to the group index, the enhancement can be also found in the dragging of light. Such enhanced dragging effect can be applied for the efficient modulators of light, position control, and the detection of slow motion. We then investigate the Fresnel’s light drag effect in another closed-loop structure, i.e. chiral molecules with a cyclic three-level Δ-type configuration, and show that left- and right-handed chiral molecules exhibit different dragging effects. This provides a possible way to probe the molecular chirality, which may find applications in the sorting and separation of chiral molecules.
We theoretically study the control of a weak quantum light in a resonant three-level condensed medium derived by a pair of resonant counterpropagating laser fields. We analytically demonstrate that the adiabatic switching on of one of the control fields generates an entangled state of photon wave packets moving together at subnormal slow velocity in the medium with relative amplitudes determined by the control laser fields. An abrupt switching-off the control field makes the entangled wave packets propagate in the opposite direction with temporally reversed profiles relative to each other. We have analyzed the quantum control of the entanglement generation in terms of the adiabatic and nonadiabatic switching operations of the coupling laser pulse.