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Lecture notes in networks and systems

Coherence Domains in Condensed Matter as Storage “Devices” of Quantum Information

Luigi Maxmilian Caligiuri

Published Oct 13, 2022• 3 citations
Publisher
DOI
10.1007/978-3-031-18344-7_15

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We investigate the potential of atomic Bose-Einstein condensates as dynamic memory devices for coherent optical information processing. Specifically, the number of ultraslow pulses that can be simultaneously present within the storage time in the condensate has been analyzed. By modeling short-pulse propagation through the condensate, taking into account high-order dispersive properties, constraints on the information storage capacity are discussed. The roles of temperature, spatial inhomogeneity, the interatomic interactions, and the coupling laser on the pulse shape are pointed out. For a restricted set of parameters, it has been found that coherent optical information storage capacity would be optimized.
We have performed a temporal structure analysis of subpicosecond signals retrieved in the time domain from a spectral modulation engraved in a photochemical hole-burning material. Two situations are examined experimentally. The first one corresponds to a spectrally programmed stimulated-photon-echo configuration, and the second one corresponds to simple optical data storage. The results are obtained in a sample of octaethylporphine molecules embedded in a polystyrene matrix. Broadband stochastic excitations are used both to write the modulation inside the inhomogeneous width of the ground level of the zero-phonon line and then to read the spectral information. An original field cross-correlation technique is used to sample the retrieved signals.