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We discuss experimental situations that consist of multiple preparation and measurement stages. This leads us to an alternative approach to quantum mechanics. In particular, we introduce the idea of multitime quantum states which are the appropriate tools for describing these experimental situations. We also describe multitime measurements and discuss their relation to multitime states. A consequence of our formalism is to put states and operators on an equal footing. Finally we discuss the implications of our approach to quantum mechanics for the problem of the flow of time.


This article was originally published in Physical Review A, volume 79, issue 5, in 2009. DOI: 10.1103/PhysRevA.79.052110

Peer Reviewed



American Physical Society



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