Afshar's Experiment does not show a Violation of Complementarity

A recent experiment performed by S. Afshar [first reported by M. Chown, New Scientist {\bf 183}, 30 (2004)] is analyzed. It was claimed that this experiment could be interpreted as a demonstration of a violation of the principle of complementarity in quantum mechanics. Instead, it is shown here that it can be understood in terms of classical wave optics and the standard interpretation of quantum mechanics. Its performance is quantified and it is concluded that the experiment is suboptimal in the sense that it does not fully exhaust the limits imposed by quantum mechanics.Comment: 6 pages, 6 figure

Quantitative conditional quantum erasure in two-atom resonance fluorescence

We present a conditional quantum eraser which erases the a priori knowledge or the predictability of the path a photon takes in a Young-type double-slit experiment with two fluorescent four-level atoms. This erasure violates a recently derived erasure relation which must be satisfied for a conventional, unconditional quantum eraser that aims to find an optimal sorting of the system into subensembles with particularly large fringe visibilities. The conditional quantum eraser employs an interaction-free, partial which-way measurement which not only sorts the system into optimal subsystems with large visibility but also selects the appropriate subsystem with the maximum possible visibility. We explain how the erasure relation can be violated under these circumstances.Comment: Revtex4, 12pages, 4 eps figures, replaced with published version, changes in Sec. 3, to appear in Physical Review

El impacto del capital social sobre la performance del proyecto empresarial de un emprendedor: el rol del acceso a la información

El presente trabajo ahonda en la temática del capital social y del entrepreneurship. Dado que bajo las condiciones competitivas de las economías modernas los recursos directamente controlados por los emprendedores no son suficientes para asegurar a sus pequeñas empresas la supervivencia y el crecimiento, en algunas oportunidades necesitan suplementarlo personalmente usando su capital social (Aldrich y Davis, 2000). El objetivo principal de este trabajo es analizar como el capital social de un emprendedor impacta sobre determinadas vías de acceso a recursos valiosos, fundamentalmente sobre el acceso a la información, impactando positivamente en la performance de su proyecto empresarial. Para llevar adelante la investigación se realiza un trabajo de contraste empírico a partir de la información primaria obtenida para este proyecto con una muestra de emprendedores argentinos.Fil: Fornoni, Mariel. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina.Fil: Ribeiro Soriano, Domingo. Universitat de València; España.Fil: Vila, José E. Universitat de València; España