Trespassing On Einstein's Lawn (2014) - Plot & Excerpts
Thus, a quantum mechanical description of a certain system (state and/or values of physical quantities) cannot be taken as an ‘absolute’ (observer-independent) description of reality, but rather as a formalization, or codification, of properties of a system relative to a given observer.… In quantum mechanics, ‘state’ as well as ‘value of a variable’—or ‘outcome of a measurement’—are relational notions.” As I read Carlo Rovelli’s paper, a gospel choir sang “Hallelujah” in my head. How had I never heard of this before? It was so simple. It was so brilliant. It was exactly what we needed. As Wheeler had emphasized in his journals, the central problem of quantum mechanics was coauthorship—the problem of the second observer. Or, as Wheeler put it, “What happens when several observers are ‘working on’ the same universe?” It was precisely this problem that Rovelli had set out to solve in his 1997 paper “Relational Quantum Mechanics,” which I had stumbled upon amid a desperate search of the physics literature for some new insight into the quantum mystery.
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