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arXiv · 2207.07270

Controlling and measuring a superposition of position and momentum

Takafumi Ono·Nigam Samantarray·John G. Rarity
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Abstract

The dynamics of a particle propagating in free space is described by its position and momentum, where quantum mechanics prohibits the simultaneous identification of two non-commutative physical quantities. Recently, a lower bound on the probability of finding a particle after propagating for a given time has been derived for well-defined initial constraints on position and momentum under the assumption that particles travel in straight lines. Here, we investigate this lower limit experimentally with photons. We prepared a superposition of position and momentum states by using slits, lenses and an interferometer, and observed a quantum interference between position and momentum. The lower bound was then evaluated using the initial state and the result was 5.9\% below this classical bound.

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Takafumi Ono, Nigam Samantarray, John G. Rarity. 2022-07-15. Controlling and measuring a superposition of position and momentum. https://doi.org/10.1103/physreva.108.012215

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