Year: 2017
Type: article
Abstract: We propose that measurements of time-of-arrival correlations in multipartite systems can sharply distinguish between different approaches to the time-of-arrival problem. To show this, we construct a positive-operator-valued measure for two distinct time-of-arrival measurements in a bipartite system, and we prove that the resulting probabilities differ strongly from ones defined in terms of probability currents. We also prove that time-of-arrival correlations are entanglement witnesses, a result suggesting the use of temporal observables for quantum information processing tasks. Finally, we construct the probabilities for sequential time-of-arrival measurements on a single particle. We derive the state-reduction rule for time-of-arrival measurements; it differs significantly from the standard one, because time-of-arrival measurements are not defined at a single predetermined moment of time.
Source: Physical Review A
Authors: Charis Anastopoulos, Ntina Savvidou
Institution: University of Patras
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2550892593