13 September 2016 Free-space quantum key distribution with a high generation rate potassium titanyl phosphate waveguide photon-pair source
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Abstract
A high generation rate photon-pair source using a dual element periodically-poled potassium titanyl phosphate (PP KTP) waveguide is described. The fully integrated photon-pair source consists of a 1064-nm pump diode laser, fiber-coupled to a dual element waveguide within which a pair of 1064-nm photons are up-converted to a single 532-nm photon in the first stage. In the second stage, the 532-nm photon is down-converted to an entangled photon-pair at 800 nm and 1600 nm which are fiber-coupled at the waveguide output. The photon-pair source features a high pair generation rate, a compact power-efficient package, and continuous wave (CW) or pulsed operation. This is a significant step towards the long term goal of developing sources for high-rate Quantum Key Distribution (QKD) to enable Earth-space secure communications. Characterization and test results are presented. Details and preliminary results of a laboratory free space QKD experiment with the B92 protocol are also presented.
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Jeffrey D. Wilson, Dalton W. Chaffee, Nathaniel C. Wilson, John D. Lekki, Roger P. Tokars, John J. Pouch, Tony D. Roberts, Philip R. Battle, Bertram Floyd, Alexander J. Lind, John D. Cavin, Spencer R. Helmick, "Free-space quantum key distribution with a high generation rate potassium titanyl phosphate waveguide photon-pair source", Proc. SPIE 9980, Quantum Communications and Quantum Imaging XIV, 99800U (13 September 2016); doi: 10.1117/12.2237742; https://doi.org/10.1117/12.2237742
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