Two-color parametric down conversion

David Castiel; Adam De La Zerda; Alex Hayat; Matty Katz; Tal Mor; Meir Orenstein; Gil Ratsaby; Nadav Yoran

doi:10.1117/12.603360

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25 May 2005 Two-color parametric down conversion

David Castiel; Adam De La Zerda; Alex Hayat; Matty Katz; Tal Mor; Meir Orenstein; Gil Ratsaby; Nadav Yoran

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Proceedings Volume 5815, Quantum Information and Computation III; (2005) https://doi.org/10.1117/12.603360
Event: Defense and Security, 2005, Orlando, Florida, United States

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.

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David Castiel, Adam De La Zerda, Alex Hayat, Matty Katz, Tal Mor, Meir Orenstein, Gil Ratsaby, and Nadav Yoran "Two-color parametric down conversion", Proc. SPIE 5815, Quantum Information and Computation III, (25 May 2005); https://doi.org/10.1117/12.603360

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