Physics – Quantum Physics
Scientific paper
2012-04-18
Physics
Quantum Physics
11 pages, 9 figures
Scientific paper
Three-level atomic gradient echo memory (lambda-GEM) is a proposed candidate for efficient quantum storage and for linear optical quantum computation with time-bin multiplexing. In this paper we investigate the spatial multimode properties of a lambda-GEM system. Using a high-speed triggered CCD, we demonstrate the storage of complex spatial modes and images. We also present an in-principle demonstration of spatial multiplexing by showing selective recall of spatial elements of a stored spin wave. Using our measurements, we consider the effect of diffusion within the atomic vapour and investigate its role in spatial decoherence. Our measurements allow us to quantify the spatial distortion due to both diffusion and inhomogeneous control field scattering and compare these to theoretical models.
Buchler Ben C.
Higginbottom Daniel B.
Hosseini Mahdi
Lam Ping Koy
Pinel Olivier
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