Abstract
A weak measurement performed on a pre- and post-selected quantum system can result in an average value that lies outside of the observable's spectrum. This effect, usually referred to as an ``anomalous weak value'', is generally believed to be possible only when a non-trivial post-selection is performed, i.e., when only a particular subset of the data is considered. Here we show, however, that this is not the case in general: in scenarios in which several weak measurements are sequentially performed, an anomalous weak value can be obtained without post-selection, i.e., without discarding any data. We discuss several questions that this raises about the subtle relation between weak values and pointer positions for sequential weak measurements. Finally, we consider some implications of our results for the problem of distinguishing different causal structures. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000372259Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
QuantumBand
Seiten / Artikelnummer
Verlag
Verein zur Förderung des Open Access Publizierens in den QuantenwissenschaftenOrganisationseinheit
03781 - Renner, Renato / Renner, Renato
Förderung
165843 - Fully quantum thermodynamics of finite-size systems (SNF)