Marsh, Brendan
Depictions of Quantum Reality in Kent's Interpretation of Quantum Theory.
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Abstract
At present, quantum theory leaves unsettled which quantities ontologically, physically exist in a quantum system. Do observables such as energy and position have meaningful values only at the precise moment of measurement, as in the Copenhagen interpretation? Or is position always definite and guided by the wave function, as in de BroglieBohm pilot wave theory? In the language of Bell, what are the ``beables" of quantum theory and what values may they take in space and time? This is the quantum reality problem. A definitive answer requires not just describing which physical quantities exist in a quantum system, but describing what configurations of those quantities in space and time are allowed, and with what probability those configurations occur. Adrian Kent sets out a new vision of quantum theory along these lines. His interpretation supplements quantum theory to infer the value of physical quantities in spacetime from the asymptotic latetime behavior of the quantum system. In doing so, a Lorentzcovariant and singleworld solution to the quantum reality problem is achieved. In this paper, the framework of Kent's interpretation is presented from the ground up. After a broad overview, a derivation of the generalized AharonovBergmannLebowitz (ABL) rule is provided before applying Kent's interpretation to toy model systems, in both relativistic and nonrelativistic settings. By adding figures and discussion, a broad introduction is provided to Kent's proposed interpretation of quantum theory.
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