Superpositions of the orbital angular momentum for applications in quantum experiments
Alipasha Vaziri; Gregor Weihs; Anton Zeilinger; Alipasha Vaziri; Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria; Gregor Weihs; Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria; Anton Zeilinger; Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria
Журнал:
Journal of Optics B: Quantum and Semiclassical Optics
Дата:
2002-04-01
Аннотация:
Two different experimental techniques for preparing and analysing superpositions of Gaussian and Laguerre–Gaussian modes are presented. These involve exploiting an interferometric method in one case and using computer-generated holograms in the other. It is shown that by shifting a hologram with respect to an incoming Gaussian beam, different superpositions of the Gaussian and the Laguerre–Gaussian beam can be produced. An analytical expression connecting the relative phase, the amplitudes of the modes and the displacement of the hologram is given. The application of such orbital angular momenta superpositions in quantum experiments such as quantum cryptography is discussed.
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