Causally agnostic interferometric measurements operationally define multipartite quantum states over spacetime regions, merging density operators, QSOT, and process matrices while revealing indistinguishable dynamics and new spatiotemporal correlations.
Multiple-time states and multiple-time measurements in quantum mechanics
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abstract
We discuss experimental situations that consist of multiple preparation and measurement stages. This leads us to a new approach to quantum mechanics. In particular, we introduce the idea of multi-time quantum states which are the appropriate tools for describing these experimental situations. We also describe multi-time measurements and discuss their relation to multi-time states. A consequence of our new formalism is to put states and operators on an equal footing. Finally we discuss the implications of our new approach to quantum mechanics for the problem of the flow of time.
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Temporal state tomography reconstructs multi-time quantum processes from temporal quasiprobability distributions via a Bloch-type representation and derives the associated sample complexity.
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Probing Quantum States Over Spacetime Through Interferometry
Causally agnostic interferometric measurements operationally define multipartite quantum states over spacetime regions, merging density operators, QSOT, and process matrices while revealing indistinguishable dynamics and new spatiotemporal correlations.
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Temporal State Tomography via Quantum Snapshotting the Temporal Quasiprobabilities
Temporal state tomography reconstructs multi-time quantum processes from temporal quasiprobability distributions via a Bloch-type representation and derives the associated sample complexity.