Controlling and measuring a superposition of position and momentum

Takafumi Ono, Nigam Samantarray, John G. Rarity

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

1 Citation (Scopus)


We present an observation of quantum interference between position and momentum with photons. We prepared a superposition of position and momentum states by using slits, lenses, and an interferometer. The precise control and measuring of propagation time of the photon results in a clear quantum interference of 85% visibility. The generated quantum state is then used to verify the violation of particle propagation inequality proposed by Hofmann [Phys. Rev. A 96, 020101(R) (2017)2469-992610.1103/PhysRevA.96.020101], resulting in 5.9% below the statistically predicted lower bound. We believe that this result is a major step towards further developments in quantum theory, such as fundamental modifications to the interpretation of quantum mechanics.

Original languageEnglish
Article number012215
JournalPhysical Review A
Issue number1
Publication statusPublished - 25 Jul 2023

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© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the ""Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.


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