@article{2021-lam-alberti-phys-rev-x-fe-in-phy-v11-p011035,
	Abstract = {<p>
	Transforming an initial quantum state into a target state through the fastest possible route&mdash;a quantum brachistochrone&mdash;is a fundamental challenge for many technologies based on quantum mechanics. Here, we demonstrate fast coherent transport of an atomic wave packet over a distance of 15 times its size&mdash;a paradigmatic case of quantum processes where the target state cannot be reached through a local transformation. Our measurements of the transport fidelity reveal the existence of a minimum duration&mdash;a quantum speed limit&mdash;for the coherent splitting and recombination of matter waves. We obtain physical insight into this limit by relying on a geometric interpretation of quantum state dynamics. These results shed light upon a fundamental limit of quantum state dynamics and are expected to find relevant applications in quantum sensing and quantum computing.</p>},
	Author = {Lam, M. R. AND Peter, N. AND Groh, T. AND Alt, W. AND Robens, C. AND Meschede, D. AND Negretti, A. AND Montangero, S. AND Calarco, T. AND Alberti, A.},
	Journal = {Phys. Rev. X (Featured in Physics)},
	Pages = {011035},
	Title = {{Demonstration of quantum brachistochrones between distant states of an atom}},
	Volume = {11},
	Year = {2021}
}