I met John Bell two and a half times. The two times, both memorable for me, were in what turned out to be in the last year of his life. The first was at a summer school in Erice in August 1989, where he delivered what came close to being the most spell-binding lecture I have ever heard. (The only competitors are Richard Feynman’s 1965 Messenger lectures at Cornell.) The text was subsequently published in a much quoted article in Physics World, “Against Measurement” . The article conveys his brilliance and his wit, but not, of course, the music of his voice.
KeywordsDensity Matrix Pure State Density Matrice Bell Inequality State Density Matrix
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