  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 Broglie-Bohm 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 late-time behavior of the quantum
system. In doing so, a Lorentz-covariant and single-world 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 Aharonov-Bergmann-Lebowitz (ABL) rule is provided
before applying Kent's interpretation to toy model systems, in both
relativistic and non-relativistic settings. By adding figures and discussion, a
broad introduction is provided to Kent's proposed interpretation of quantum
theory.
