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Laser Optics & Photonics and Atomic & Plasma Science 2018
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 56
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
T
he spontaneous parametric down conversion (SPDC) process is widely
used in the fields of nonlinear optics and quantum key distribution. The
brightness, heralding efficiency and the fidelity are key parameters to be
maximized in the SPDC sources. While the heralding efficiency is determined
by the collection efficiency and the photon detection efficiencies (PDE) of
the single photon detectors, the entanglement quality and brightness of the
photon pairs created by spontaneous parametric down conversion process
are effected by various parameters. The difference in the arrival times of the
signal/idler pairs of two orthogonal polarizations reduces the fidelity of the
states by introducing decoherence. Another parameter affecting the fidelity
of the states is length tolerance of the nonlinear crystals. The decoherence
in the setup can be compensated by the use of a very narrow linewidth pump
laser. The limits of the trade-off between the crystal length tolerance and the
laser line width have been identified for target entanglement fidelity values.
The effect of different types of collection lenses has also been identified for
enhancement of the heralding efficiency values. A full analysis of parameters
for the optimization of SPDC sources is done via a set of numerical simulations.
Further recommendations have also been included in this work for reaching
very high brightness, heralding efficiency and entanglement fidelity values of
the entangled photon pair sources.
Biography
KadirDurakhasreceivedhisBScdegree inMiddleEastTechnical
University Physics Department in 2009 and he started his PhD
in National University of Singapore at the same year. After
receiving PhD in 2015 he worked for two years in Centre for
Quantum Technologies as Team Lead in a research group that
works on space-ground quantumkey distribution via a CubeSat.
Hismain research areas are QuantumCryptography, Photonics,
Quantum Electrodynamics and Quantum Information. He is
currently pursuing his Research in Ozyegin University with his
research group
.
kadir.durak@ozyegin.edu.trOptimization Of Entangled Photon Pair Sources
Kadir Durak, Esra Malyer and Can Eraydın
Ozyegin University, Turkey
Kadir Durak et al., Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-002