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@ARTICLE{Lam:907162,
      author       = {Lam, Manolo R. and Peter, Natalie and Groh, Thorsten and
                      Alt, Wolfgang and Robens, Carsten and Meschede, Dieter and
                      Negretti, Antonio and Montangero, Simone and Calarco,
                      Tommaso and Alberti, Andrea},
      title        = {{D}emonstration of {Q}uantum {B}rachistochrones between
                      {D}istant {S}tates of an {A}tom},
      journal      = {Physical review / X},
      volume       = {11},
      number       = {1},
      issn         = {2160-3308},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2022-01871},
      pages        = {011035},
      year         = {2021},
      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.},
      cin          = {PGI-8},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-8-20190808},
      pnm          = {5221 - Advanced Solid-State Qubits and Qubit Systems
                      (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5221},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000620021000001},
      doi          = {10.1103/PhysRevX.11.011035},
      url          = {https://juser.fz-juelich.de/record/907162},
}