Measuring Incompatible Observables by Exploiting Sequential Weak Values

F. Piacentini, A. Avella, M. P. Levi, M. Gramegna, G. Brida, I. P. Degiovanni, E. Cohen, R. Lussana, F. Villa, A. Tosi, F. Zappa, M. Genovese

Research output: Contribution to journalArticle (Academic Journal)peer-review

45 Citations (Scopus)
274 Downloads (Pure)

Abstract

One of the most intriguing aspects of quantum mechanics is the impossibility of measuring at the same time observables corresponding to noncommuting operators, because of quantum uncertainty. This impossibility can be partially relaxed when considering joint or sequential weak value evaluation. Indeed, weak value measurements have been a real breakthrough in the quantum measurement framework that is of the utmost interest from both a fundamental and an applicative point of view. In this Letter, we show how we realized for the first time a sequential weak value evaluation of two incompatible observables using a genuine single-photon experiment. These (sometimes anomalous) sequential weak values revealed the single-operator weak values, as well as the local correlation between them.
Original languageEnglish
Article number170402
Number of pages6
JournalPhysical Review Letters
Volume117
Issue number17
DOIs
Publication statusPublished - 20 Oct 2016

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