Scientific article
Open access

Anomalous Weak Values Without Post-Selection

Published inQuantum, vol. 3, 194
Publication date2019

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.

Citation (ISO format)
ABBOTT, Alastair et al. Anomalous Weak Values Without Post-Selection. In: Quantum, 2019, vol. 3, p. 194. doi: 10.22331/q-2019-10-14-194
Main files (1)
Article (Accepted version)
ISSN of the journal2521-327X

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Creation12/02/2019 3:28:00 PM
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