A quantum evolution over several instants can be represented as a single vector in a tensor product of Hilbert spaces using the entangled history formalism, resolving Aharonov's challenge.
From this model, we can use quantum tomography to know what the unknown state it is
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Discrete-Time Modelling of Quantum Evolutions, the Energy-Time Uncertainty Relation and General Extensions in the Entangled History Formalism
A quantum evolution over several instants can be represented as a single vector in a tensor product of Hilbert spaces using the entangled history formalism, resolving Aharonov's challenge.