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  • Cross-phase modulation and entanglement in a compound gradient echo memory

    Author(s)
    Fu, Shuangshuang
    Carvalho, Andre R. R.
    Hush, Michael R.
    James, Matthew R.
    Griffith University Author(s)
    Ribeiro de Carvalho, Andre R.
    Year published
    2016
    Metadata
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    Abstract
    We present a theoretical model for a Kerr-like interaction between two registers of a compound gradient echo memory (GEM). This type of interaction is known to generate cross-phase modulation (XPM) between optical fields, an effect that is limited by the typically small values of nonlinearities in crystals. Here we show that in GEM systems the phase shift increases linearly with the interaction time and quadratically with the strength of the field. Increasing storage (interaction) times would then lead to stronger XPM effects even with fields with very low intensity. This interaction also generates two other effects: ...
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    We present a theoretical model for a Kerr-like interaction between two registers of a compound gradient echo memory (GEM). This type of interaction is known to generate cross-phase modulation (XPM) between optical fields, an effect that is limited by the typically small values of nonlinearities in crystals. Here we show that in GEM systems the phase shift increases linearly with the interaction time and quadratically with the strength of the field. Increasing storage (interaction) times would then lead to stronger XPM effects even with fields with very low intensity. This interaction also generates two other effects: entanglement between the registers, which depends on the strength of the interaction and its spatial profile, and an interaction-induced gradient. We show that the latter produces leakage during the storage stage depending on the shape of the stored pulses, an undesirable consequence that can be minimized by carefully designing the temporal profile of the input fields.
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    Journal Title
    Physical Review A
    Volume
    93
    Issue
    2
    DOI
    https://doi.org/10.1103/PhysRevA.93.023809
    Subject
    Optical Physics not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/342760
    Collection
    • Journal articles

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