Universality of local weak interactions and its application for interferometric alignment.
basic_science · Level V
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- Record sourced from PubMed, PMID 30723153.
- Also identified by DOI 10.1073/pnas.1812970116 and PMC identifier 6386691.
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Abstract
The modification of the effect of interactions of a particle as a function of its preselected and postselected states is analyzed theoretically and experimentally. The universality property of this modification in the case of local interactions of a spatially preselected and postselected particle has been found. It allowed us to define an operational approach for the characterization of the presence of a quantum particle in a particular place: the way it modifies the effect of local interactions. The experiment demonstrating this universality property provides an efficient interferometric alignment method, in which the position of the beam on a single detector throughout one phase scan yields all misalignment parameters.