Superpositions of the Orbital Angular Momentum for Applications in Quantum Experiments

Details Superpositions of the Orbital Angular Momentum for Applications in Quantum Experiments Superpositions of the Orbital Angular Momentum for Applications in Quantum Experiments

2001-11-06

arxiv.org/abs/quant-ph/0111033v2

Physics

Quantum Physics

18 pages, 4 figures. to appear in Journal of Optics B

Scientific paper

10.1088/1464-4266/4/2/367

Two different experimental techniques for preparation and analyzing superpositions of the Gaussian and Laguerre-Gassian modes are presented. This is done exploiting an interferometric method on the one hand and using computer generated holograms on the other hand. It is shown that by shifting the hologram with respect to an incoming Gaussian beam different superpositions of the Gaussian and the Laguerre-Gaussian beam can be produced. An analytical expression between the relative phase and 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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