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Proceedings Paper

New results on single-photon upconversion
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Paper Abstract

The process of up-conversion is shown to enable superior single-photon detectors in the infrared, compared to InGaAs and germanium Avalanche Photodiodes (APDs) (normally used for IR single photon detection). After up-converting an infrared photon to a visible one in a non-linear crystal-Periodically Poled Lithium Niobate (PPLN)-we use a silicon APD to efficiently detect the frequency up-shifted IR photon. We have demonstrated this process at the "high-intensity" level and at the single-photon level, where the up-converted state is effectively a superposition of the single photon Fock state and the vacuum state. We achieve an 80% conversion efficiency over the width of the pulse, and show that this process is coherent, a necessary ingredient for many applications.

Paper Details

Date Published: 19 October 2004
PDF: 8 pages
Proc. SPIE 5551, Quantum Communications and Quantum Imaging II, (19 October 2004); doi: 10.1117/12.564880
Show Author Affiliations
Aaron P. VanDevender, Univ. of Illinois/Urbana-Champaign (United States)
Paul G. Kwiat, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 5551:
Quantum Communications and Quantum Imaging II
Ronald E. Meyers; Yanhua Shih, Editor(s)

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