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

Shuangshuang Fu, André R. R. Carvalho, Michael R. Hush, and Matthew R. James
Phys. Rev. A 93, 023809 – Published 4 February 2016

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: 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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  • Received 30 August 2015
  • Revised 4 January 2016

DOI:https://doi.org/10.1103/PhysRevA.93.023809

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Shuangshuang Fu1,2,*, André R. R. Carvalho3,4,†, Michael R. Hush5,‡, and Matthew R. James2,4,§

  • 1School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
  • 2Research School of Engineering, The Australian National University, Canberra, ACT 0200, Australia
  • 3Department of Quantum Science, Research School of Physics and Engineering, Australian National University, Canberra, Australia
  • 4ARC Centre for Quantum Computation and Communication Technology, The Australian National University, ACT 0200, Australia
  • 5School of Engineering and Information Technology, University of New South Wales at ADFA, Canberra, ACT 2600, Australia

  • *shuangshuang.fu@ustb.edu.cn
  • andre.carvalho@anu.edu.au
  • M.Hush@adfa.edu.au
  • §matthew.james@anu.edu.au

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Issue

Vol. 93, Iss. 2 — February 2016

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