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arXiv:physics/0503166 · Chinese Physics Letters

Super-Resolution of Interference Pattern with Independent Laser Beams

Xiong Jun, Huang Feng, De-Zhong Cao, Hong-Guo Li, Sun Xu-Juan, Kaige Wang

Published Oct 27, 2005• 4 citations
arXivHTMLPDF

Abstract

We propose a scheme to achieve super-resolution of interference pattern with independent laser beams. We perform an experimental observation of a double-slit interference with two orthogonally polarized laser beams. The resolution of the interference pattern measured by a two-photon detection is doubled provided the two beams illuminate the double-slit with certain incident angles. The scheme is simple and can favour both high intensity and perfect visibility.

DOI
10.1088/0256-307x/22/11/027

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Using coherent states, linear optics, and NNN-photon detection we demonstrate the synthesis of arbitrary interference patterns and establish that neither the shape nor the visibility of NNN-photon interference patterns can be used as a quantum signature in general. Specific examples include saw-curve and rectangle-curve interference patterns and phase super-resolution with period shortening of up to 60 times compared to ordinary interference. The former two have visibility close to 100% and the latter has visibility in excess of 57%.
We report a quantum eraser experiment which actually uses a Young double slit to create interference. The experiment can be considered an optical analogy of an experiment proposed by Scully, Englert, and Walther [Nature (London) 351, 111 (1991)]. One photon of an entangled pair is incident on a Young double slit of appropriate dimensions to create an interference pattern in a distant detection region. Quarter-wave plates, oriented so that their fast axes are orthogonal, are placed in front of each slit to serve as which-path markers. The quarter-wave plates mark the polarization of the interfering photon and thus destroy the interference pattern. To recover interference, we measure the polarization of the other entangled photon. In addition, we perform the experiment under ``delayed erasure'' circumstances.