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Proceedings Paper

Two-color parametric down conversion
Author(s): David Castiel; Adam De La Zerda; Alex Hayat; Matty Katz; Tal Mor; Meir Orenstein; Gil Ratsaby; Nadav Yoran
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Paper Abstract

We propose a point to point quantum channel based on a two-color Spontaneous Parametric Down Conversion (SPDC), that may be applied for a Quantum Key Distribution (QKD) system to gain better security. We use one arm of the SPDC (770 nm - optimal for Si detection) and a Si counter at Alice's side to count the exact number of photons in each pulse. Whenever the arm contains exactly one photon, the correlated photon (1550nm - optimal for fiber transmission) in the other arm is sent via a fiber to Bob. In the experiment we used an Ar^{+} laser of 514.5nm wavelength and a BBO crystal to produce type-I photon pairs. We measured the spectrum of the SPDC and resolved specifically the 770 nm wavelength. The rate of correlated pairs (at 890-1050 nm) from our SPDC source was compared to a non-correlated source. We further developed an InGaAs single photon detector based on Geiger mode APD and achieved 10% quantum efficiency and 5 * 10^{-3} dark counts per 20nsec pulse at a temperature of -35 degrees Celsius.

Paper Details

Date Published: 25 May 2005
PDF: 6 pages
Proc. SPIE 5815, Quantum Information and Computation III, (25 May 2005); doi: 10.1117/12.603360
Show Author Affiliations
David Castiel, Technion - Israel Institute of Technology (Israel)
Adam De La Zerda, Technion - Israel Institute of Technology (Israel)
Alex Hayat, Technion - Israel Institute of Technology (Israel)
Matty Katz, Technion - Israel Institute of Technology (Israel)
Tal Mor, Technion - Israel Institute of Technology (Israel)
Meir Orenstein, Technion - Israel Institute of Technology (Israel)
Gil Ratsaby, Technion - Israel Institute of Technology (Israel)
Nadav Yoran, Technion - Israel Institute of Technology (Israel)


Published in SPIE Proceedings Vol. 5815:
Quantum Information and Computation III
Eric J. Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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