Hello all, I am writing an article on the definition of "observer" in a quantum mechanics context. From what I know about QM, most consider that an inanimate apparatus and even individual particles can function as the "observer" in quantum measurements. I also know that the 1991 experiment by Mandel, Wang, and Zou pretty much established that the experimental setup is what determines whether quanta behave as particles or waves, not what the experimenter actually determines or chooses to learn. However, I came across a 1996 talk by the late computer scientist Seymour Cray, who described a then-recent experiment which would seem to contradict this. A computer performed wave/particle duality experiments and stored the results in memory. This data then appeared to remain in macroscopic superposition until a human experimenter actually checked the files, thus suggesting (incredibly) that a machine cannot function as a quantum observer in the capacity that a human observer can. I have spent literally hours searching Google Scholar (and regular Google) for this experiment, turning up absolutely nothing. I am starting to think that Cray was mistaken, that this experiment never happened. http://americanhistory.si.edu/collections/comphist/montic/cray.htm" [Broken] of Cray's talk -- he discusses the experiment in the sections "Wave/Particle Duality and Computers" and "Giving Meaning to Binary Data." Whether you know anything about this experiment or not, any insight is greatly appreciated!