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000907162 1001_ $$0P:(DE-HGF)0$$aLam, Manolo R.$$b0
000907162 245__ $$aDemonstration of Quantum Brachistochrones between Distant States of an Atom
000907162 260__ $$aCollege Park, Md.$$bAPS$$c2021
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000907162 520__ $$aTransforming an initial quantum state into a target state through the fastest possible route—a quantum brachistochrone—is a fundamental challenge for many technologies based on quantum mechanics. In two-level systems, the quantum brachistochrone solutions are long known. These solutions, however, are not applicable to larger systems, especially when the target state cannot be reached through a local transformation. Here, we demonstrate fast coherent transport of an atomic wave packet over a distance of 15 times its size—a paradigmatic case of quantum processes going beyond the two-level system. Our measurements of the transport fidelity reveal the existence of a minimum duration—a quantum speed limit—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 on a fundamental limit of quantum state dynamics and are expected to find relevant applications in quantum sensing and quantum computing.
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000907162 7001_ $$0P:(DE-HGF)0$$aPeter, Natalie$$b1
000907162 7001_ $$0P:(DE-HGF)0$$aGroh, Thorsten$$b2
000907162 7001_ $$0P:(DE-HGF)0$$aAlt, Wolfgang$$b3
000907162 7001_ $$0P:(DE-HGF)0$$aRobens, Carsten$$b4
000907162 7001_ $$0P:(DE-HGF)0$$aMeschede, Dieter$$b5
000907162 7001_ $$0P:(DE-HGF)0$$aNegretti, Antonio$$b6
000907162 7001_ $$0P:(DE-HGF)0$$aMontangero, Simone$$b7
000907162 7001_ $$0P:(DE-Juel1)176280$$aCalarco, Tommaso$$b8$$ufzj
000907162 7001_ $$0P:(DE-HGF)0$$aAlberti, Andrea$$b9$$eCorresponding author
000907162 773__ $$0PERI:(DE-600)2622565-7$$a10.1103/PhysRevX.11.011035$$gVol. 11, no. 1, p. 011035$$n1$$p011035$$tPhysical review / X$$v11$$x2160-3308$$y2021
000907162 8564_ $$uhttps://juser.fz-juelich.de/record/907162/files/PhysRevX.11.011035.pdf$$yOpenAccess
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000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$aInstitut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany $$b0
000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Institut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany$$b1
000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Institut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany$$b2
000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Institut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany$$b3
000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Institut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany$$b4
000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Institut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany$$b5
000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Zentrum für Optische Quantentechnologien, Fachbereich Physik, and The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, 22761 Hamburg, Germany$$b6
000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Dipartimento di Fisica e Astronomia “G. Galilei,” Universit`a degli Studi di Padova, and Istituto Nazionale di Fisica Nucleare, 35131 Padova, Italy$$b7
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000907162 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a Institut für Angewandte Physik, Universität Bonn, 53115 Bonn, Germany$$b9
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