Abstract
A scheme for control and read-out of diffracted spins waves to propagating light fields is presented. Diffraction is obtained via sinusoidally varying lights shifts and ideal one-to-one mapping to light is realized using a gradient echo quantum memory. We also show that dynamical control of the diffracted spin waves spatial orders can be implemented to realize a quantum pulse sequencer for temporal modes that have high time-bandwidth products. Full numerical solutions suggest that both co-propagating and counterpropagating light shift geometries can be used, making the proposal applicable to hot and cold atomic vapours as well as solid state systems with two-level atoms.
Highlights
After an input pulse with temporal width Δt enters the medium, polaritonic modes with increasing momentum k over time are created
We show that for specific durations of the grating imprint, the coupling of the spin wave to the output field is efficiently canceled and that diffraction can be temporally reversed by displacing the grating nodes
We suppose that the effective two-level atoms form a quasi one-dimensional ensemble along a direction z
Summary
After an input pulse with temporal width Δt enters the medium, polaritonic modes with increasing momentum k over time are created. We demonstrate that GEM can be used in conjunction with a grating to enable efficient coherent mapping between diffracted modes and propagating light fields.
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