Quantum Probabilities for the Causal Ordering of Events

Author:

Anastopoulos Charis1ORCID,Plakitsi Maria-Electra2

Affiliation:

1. Department of Physics, University of Patras, 26500 Patras, Greece

2. Department of Electrical and Computing Engineering, University of Patras, 26500 Patras, Greece

Abstract

We develop a new formalism for constructing probabilities associated with the causal ordering of events in quantum theory, where an event is defined as the emergence of a measurement record on a detector. We start with constructing probabilities for the causal ordering events in classical physics, where events are defined in terms of worldline coincidences. Then, we show how these notions generalize to quantum systems, where there exists no fundamental notion of trajectory. The probabilities constructed here are experimentally accessible, at least in principle. Our analysis here clarifies that the existence of quantum orderings of events do not require quantum gravity effects: it is a consequence of the quantum dynamics of matter, and it appears in the presence of a fixed background spacetime.

Publisher

MDPI AG

Subject

General Medicine

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