Brunner, TRoux, FS2013-08-052013-08-052013-06Brunner, T and Roux, F.S. 2013. Robust entangled qutrit states in atmospheric turbulence. New Journal of Physics, vol. 15, pp 1-111367-2630http://arxiv.org/pdf/1211.3203v1.pdfhttp://hdl.handle.net/10204/6931Copyright: 2013 Institute of Physics. This is an open access journal. This journal authorizes the publication of the information herein contained.The entangled quantum state of a photon pair propagating through atmospheric turbulence suffers decay of entanglement due to the scintillation it experiences. Here we investigate the robustness against this decay for different qutrit states. We use an infinitesimal-propagation equation to obtain the density matrix as a function of the propagation distance and we use the tangle to quantify the entanglement between a pair of qutrits. The evolution of various initial states as they propagate through turbulence is considered. Using optimization of the initial parameters, we obtain expressions for bipartite qutrit states that retain their initial entanglement longer than the initially maximally entangled states.enFree-space quantum communicationEntangled statesAtmospheric turbulenceArticleBrunner, T., & Roux, F. (2013). Robust entangled qutrit states in atmospheric turbulence. http://hdl.handle.net/10204/6931Brunner, T, and FS Roux "Robust entangled qutrit states in atmospheric turbulence." (2013) http://hdl.handle.net/10204/6931Brunner T, Roux F. Robust entangled qutrit states in atmospheric turbulence. 2013; http://hdl.handle.net/10204/6931.TY - Article AU - Brunner, T AU - Roux, FS AB - The entangled quantum state of a photon pair propagating through atmospheric turbulence suffers decay of entanglement due to the scintillation it experiences. Here we investigate the robustness against this decay for different qutrit states. We use an infinitesimal-propagation equation to obtain the density matrix as a function of the propagation distance and we use the tangle to quantify the entanglement between a pair of qutrits. The evolution of various initial states as they propagate through turbulence is considered. Using optimization of the initial parameters, we obtain expressions for bipartite qutrit states that retain their initial entanglement longer than the initially maximally entangled states. DA - 2013-06 DB - ResearchSpace DP - CSIR KW - Free-space quantum communication KW - Entangled states KW - Atmospheric turbulence LK - https://researchspace.csir.co.za PY - 2013 SM - 1367-2630 T1 - Robust entangled qutrit states in atmospheric turbulence TI - Robust entangled qutrit states in atmospheric turbulence UR - http://hdl.handle.net/10204/6931 ER -