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PubMed · 12879912

Comment on "Interferometric phase-only optical encryption system that uses a reference wave".

Jesper Glückstad·Vincent R Daria·Peter J Rodrigo
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Abstract

We explain the vulnerability of the phase-only encryption procedure suggested by Seo and Kim [Opt. Lett. 28, 304 (2003)] and clarify issues regarding its robustness and degree of security compared with those of a previously reported phase-only encryption method.

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Jesper Glückstad, Vincent R Daria, Peter J Rodrigo. 2003-07-01. Comment on "Interferometric phase-only optical encryption system that uses a reference wave".. https://doi.org/10.1364/ol.28.001075

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Atomic populations and localization [lambda(A)] and delocalization [delta(A,B)] indices (LIs and DIs) are calculated for a large set of molecules at the Hartree-Fock (HF), MP2, MP4(SDQ), CISD, and QCISD levels with the 6-311++G(2d,2p) basis set. The HF method and the conventional correlation methods [MP2, MP4(SDQ), CISD, and QCISD] yield distinct sets of LIs and DIs. Yet, within the four conventional correlation methods the differences in atomic populations and LIs and DIs are small. Relative to HF, the conventional correlation methods [MP2, MP4(SDQ), CISD, QCISD] yield virtually the same LIs and DIs for molecules with large charge separations while LIs and DIs that differ significantly from the HF values--the LIs are increased and DIs decreased--are obtained for bonds with no or small charge separations. Such is the case in the archetypal homopolar molecules HC(triple bond)CH, H2C=CH2, CH3-CH3, and "protonated cyclopropane" C(3)H(7) (+), in which case the bonding may be atypical. Relative to HF, the typical effect of the conventional correlation methods is to decrease the DI between atoms.

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