Hamadou Ibrahim, ARoux, FSKonrad, T2011-10-072011-10-072011-08Hamadou Ibrahim, A, Roux, FS and Konrad, T. 2011. Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence. Quantum Communications and Quantum Imaging IX, San Diego, California, USA, 24-25 August 20119780819487735http://hdl.handle.net/10204/5207Quantum Communications and Quantum Imaging IX, San Diego, California, USA, 24-25 August 2011he orbital angular momentum (OAM) state of light can potentially be used to implement higher dimensional entangled systems for quantum communication. Unfortunately, optical fibers in use today support only modes with zero OAM values. Free-space quantum communication is an alternative to traditional way of communicating through optical fibers. However the refractive index fluctuation of the atmosphere gives rise to random phase aberrations on a propagating optical beam. To transmit quantum information successfully through a free-space optical channel, one needs to understand how atmospheric turbulence influences quantum entanglement. Here, we present a numerical study of the evolution of quantum entanglement between a pair of qubits. The qubits consist of photons entangled in the OAM basis. The photons propagate in a turbulent atmosphere modeled by a series of consecutive phase screens based on the Kolmogorov theory of turbulence. Maximally entangled initial states are considered, and the concurrence is used as a measure of entanglement. We show how the evolution of entanglement is influenced by various parameters such as the beam waist, the strength of the turbulence and the wavelength of the beam. We restricted our analysis to the OAM values l = ±1 and we compared our results to previous work.enOrbital angular momentumFree space quantum communicationQuantum communicationsQuantum imagingAtmospheric turbulenceConference PresentationHamadou Ibrahim, A., Roux, F., & Konrad, T. (2011). Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence. SPIE. http://hdl.handle.net/10204/5207Hamadou Ibrahim, A, FS Roux, and T Konrad. "Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence." (2011): http://hdl.handle.net/10204/5207Hamadou Ibrahim A, Roux F, Konrad T, Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence; SPIE; 2011. http://hdl.handle.net/10204/5207 .TY - Conference Presentation AU - Hamadou Ibrahim, A AU - Roux, FS AU - Konrad, T AB - he orbital angular momentum (OAM) state of light can potentially be used to implement higher dimensional entangled systems for quantum communication. Unfortunately, optical fibers in use today support only modes with zero OAM values. Free-space quantum communication is an alternative to traditional way of communicating through optical fibers. However the refractive index fluctuation of the atmosphere gives rise to random phase aberrations on a propagating optical beam. To transmit quantum information successfully through a free-space optical channel, one needs to understand how atmospheric turbulence influences quantum entanglement. Here, we present a numerical study of the evolution of quantum entanglement between a pair of qubits. The qubits consist of photons entangled in the OAM basis. The photons propagate in a turbulent atmosphere modeled by a series of consecutive phase screens based on the Kolmogorov theory of turbulence. Maximally entangled initial states are considered, and the concurrence is used as a measure of entanglement. We show how the evolution of entanglement is influenced by various parameters such as the beam waist, the strength of the turbulence and the wavelength of the beam. We restricted our analysis to the OAM values l = ±1 and we compared our results to previous work. DA - 2011-08 DB - ResearchSpace DP - CSIR KW - Orbital angular momentum KW - Free space quantum communication KW - Quantum communications KW - Quantum imaging KW - Atmospheric turbulence LK - https://researchspace.csir.co.za PY - 2011 SM - 9780819487735 T1 - Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence TI - Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence UR - http://hdl.handle.net/10204/5207 ER -