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Proceedings Paper

Femtosecond laser-pumped source of entangled photons for quantum cryptography applications
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Paper Abstract

We present an experimental setup for generation of entangled-photon pairs via spontaneous parametric down-conversion, based on the femtosecond-pulsed laser. Our entangled-photon source utilizes a 76-MHz-repetition-rate, 100-fs-pulsewidth, mode-locked, ultrafast femtosecond laser, which can produce, on average, more photon pairs than a cw laser of an equal pump power. The output infrared pump photons (λ = 810 nm) are first up-converted to blue light (λ = 405 nm) and, subsequently, down-converted in a 1.5-mm-thick, type-II BBO crystal via spontaneous down-conversion. The resulting entangled pairs are counted by a pair of high-quantum-efficiency, single-photon, silicon avalanche photodiodes. The total down-conversion efficiency of our system, corresponding criterion of the pump power for real entangled coincident events, has been calculated to be 0.86 × 10-9. Our apparatus is intended as an efficient source/receiver system for the quantum communications and quantum cryptography applications.

Paper Details

Date Published: 11 May 2007
PDF: 9 pages
Proc. SPIE 6583, Photon Counting Applications, Quantum Optics, and Quantum Cryptography, 65830K (11 May 2007); doi: 10.1117/12.723698
Show Author Affiliations
Dong Pan, Univ. of Rochester (United States)
William Donaldson, Univ. of Rochester (United States)
Roman Sobolewski, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 6583:
Photon Counting Applications, Quantum Optics, and Quantum Cryptography
Miloslav Dusek; Mark S. Hillery; Wolfgang P. Schleich; Ivan Prochazka; Alan L. Migdall; Alexandre Pauchard, Editor(s)

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