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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5207

Title: Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence
Authors: Hamadou Ibrahim, A
Roux, FS
Konrad, T
Keywords: Orbital angular momentum
Free space quantum communication
Quantum communications
Quantum imaging
Atmospheric turbulence
Issue Date: Aug-2011
Publisher: SPIE
Citation: Hamadou 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 2011
Series/Report no.: Workflow request;7328
Abstract: 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.
Description: Quantum Communications and Quantum Imaging IX, San Diego, California, USA, 24-25 August 2011
URI: http://hdl.handle.net/10204/5207
ISBN: 9780819487735
Appears in Collections:Laser physics and technology
General science, engineering & technology

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