Journal Article

FZJ-2022-01871

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Demonstration of Quantum Brachistochrones between Distant States of an Atom

Lam, M. R. ; Peter, N. ; Groh, T. ; Alt, W. ; Robens, C. ; Meschede, D. ; Negretti, A. ; Montangero, S. ; Calarco, T.FZJ* ; Alberti, A. (Corresponding author)

2021
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/31007  doi:10.1103/PhysRevX.11.011035

Abstract: Transforming 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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Contributing Institute(s):

1. Quantum Control (PGI-8)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)

Appears in the scientific report 2022

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