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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

One-way autocompensating quantum cryptography via auto-phase-matched spontaneous parametric down-converstion

Zachary Walton, Ayman F. Abouraddy, Mark C. Booth, Alexander V. Sergienko, Bahaa E. A. Saleh, Malvin Carl Teich

Published Feb 3, 2004• 0 citations
Publisher

Abstract

We present a new quantum cryptography implementation that uses frequency-correlated photon pairs to combine one-way operation with an autocompensating feature that has hitherto only been available in implementations that require the signal to make a round trip between the users. Furthermore, we describe a new scheme for creating frequency-correlated photon pairs (auto-phase-matched spontaneous parametric down-conversion). The new scheme offers several advantages over previous schemes, including the ability to generate frequency-correlated photon pairs regardless of the dispersion characteristics of the system.

DOI
10.1117/12.503748

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A quantum cryptography implementation is presented that uses entanglement to combine one-way operation with an autocompensating feature that has hitherto only been available in implementations that require the signal to make a round trip between the users. Using the concept of advanced waves, it is shown that this proposed implementation is related to the round-trip implementation in the same way that Ekert's two-particle scheme is related to the original one-particle scheme of Bennett and Brassard. The practical advantages and disadvantages of the proposed implementation are discussed in the context of existing schemes.
Entangled photon pairs have attracted many interests from the view of quantum science and technologies. However, there are still several technical issues remaining in the conventional generation method, such as complexity and inefficiency. Here we propose a simple scheme to generate frequency-entangled photon pairs via spontaneous parametric down-conversion in periodically poled stoichiometric lithium tantalite. Our method will open a way to construct a compact and efficient source of entangled photons for quantum sensing.
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Quantum Imaging Laboratory, Department of Electrical & Computer Engineering,Boston University, 8 Saint Mary’s Street, Boston, Massachusetts 02215-2421A new method for generating entangled photons with controllable frequency correlation via spon-taneous parametric down-conversion (SPDC) is presented. The method entails initiating counter-propagating SPDC in a single-mode nonlinear waveguide by pumping with a pulsed beam perpen-dicular to the waveguide. The method offers several advantages over other schemes, including theability to generate frequency-correlated photon pairs regardless of the dispersion characteristics ofthe system.