12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

Validation of a numerical simulation to study the decoherence of quantum orbital angular momentum entanglement due to atmospheric turbulence

15 Jul 2011, 08:45


Oral Presentation Track C - Lasers, Optics and Spectroscopy LOS


Mr Alpha Hamadou Ibrahim (CSIR, National Laser Center)


The orbital angular momentum (OAM) state of light has been the object of much interest within the quantum information community lately mainly because it can be used to implement higher dimensional entanglement. Unfortunately, the OAM cannot be used for quantum communication through optical fibers in use today because these fibers support only modes with zero OAM values. One can alternatively use free-space communication. However, one needs to understand how atmospheric turbulence affects quantum entanglement. In recent years, numerical simulation has become a very important and successful approach for solving complex problems and to gain more insight into scientific phenomena. In this work, we present a numerical simulation to study the decoherence of quantum entanglement between a pair of qubits due to atmospheric turbulence. The qubits are photons entangled in their OAM mode. The photons propagate in a turbulent atmosphere modeled by a series of consecutive phase screens based on the Kolmogorov theory of turbulence and the concurrence is used as entanglement measure. We validate our simulation scheme with the formula derived in "Nature Physics 4 99 - 102 (2008)" stating that the entanglement reduction under a one-sided noisy channel is independent of the initial state and completely determined by the channels action on a maximally entangled state.

Level (Hons, MSc, <br> &nbsp; PhD, other)? PhD
Consider for a student <br> &nbsp; award (Yes / No)? Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? No

Primary author

Mr Alpha Hamadou Ibrahim (CSIR, National Laser Center)


Dr Filippus Roux (CSIR, National Laser Center) Prof. Thomas Konrad (University of Kwazulu-Natal)

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