ua nt - p h / 05 03 10 8 v 1 1 0 M ar 2 00 5 Local Instruction - Set Model for the Experiment of Pan et al

We present a modified local realistic model, based on instruction sets that can be used to approximately reproduce the data of the Pan et al experiment. The data of our model are closer to the results of the actual experiment by Pan et al than the predictions of their quantum mechanical model. As a consequence the experimental results can not be used to support their claim that quantum nonlocality has been proven. The discussions of Einstein-Podolsky-Rosen (EPR) [1] and Bohr [2] relating to the completeness of quantum mechanics have resulted in significant theoretical [3, 4, 5] and experimental [6, 7, 8] work on EPR-type experiments. At present there is general agreement on the quantum mechanical models (QMM) of the investigated experiments. Nevertheless, several theoretical aspects such as the mathematical nature and properties of parameters used in objective local models [9] are still in discussion. These parameters are considered to represent the physical elements that determine the measurement result in the actual experiments. They may for example characterize quantum particles emitted from a source that is independent from the remote measuring equipment. Or an objective local model may consist of parameters that define the source information and the measuring equipment properties at the time of measurement [10]. In spite of the complexities involved in these discussions, it is universally agreed that as a minimum, an EPR give the following definition of locality:“Since at the time of measurement the two systems no longer interact, no real change can take place in the second system in consequence of anything that may be done to the first system.”[1]