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Interferometry with non-classical motional states of a Bose–Einstein condensate

Author

Listed:
  • S. van Frank

    (Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2)

  • A. Negretti

    (Zentrum für Optische Quantentechnologien, Universität Hamburg, The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149
    Institut für Quanteninformationsverarbeitung, Universität Ulm, Albert-Einstein-Allee 11)

  • T. Berrada

    (Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2)

  • R. Bücker

    (Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2
    Max Planck Institute for the Structure and Dynamics of Matter, Bldg. 99 (CFEL), Luruper Chaussee 149)

  • S. Montangero

    (Institut für Quanteninformationsverarbeitung, Universität Ulm, Albert-Einstein-Allee 11
    Center for Integrated Quantum Science and Technology (IQST), Universität of Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany)

  • J.-F. Schaff

    (Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2)

  • T. Schumm

    (Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2)

  • T. Calarco

    (Institut für Quanteninformationsverarbeitung, Universität Ulm, Albert-Einstein-Allee 11
    Center for Integrated Quantum Science and Technology (IQST), Universität of Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany)

  • J. Schmiedmayer

    (Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2)

Abstract

The Ramsey interferometer is a prime example of precise control at the quantum level. It is usually implemented using internal states of atoms, molecules or ions, for which powerful manipulation procedures are now available. Whether it is possible to control external degrees of freedom of more complex, interacting many-body systems at this level remained an open question. Here we demonstrate a two-pulse Ramsey-type interferometer for non-classical motional states of a Bose–Einstein condensate in an anharmonic trap. The control sequences used to manipulate the condensate wavefunction are obtained from optimal control theory and are directly optimized to maximize the interferometric contrast. They permit a fast manipulation of the atomic ensemble compared to the intrinsic decay processes and many-body dephasing effects. This allows us to reach an interferometric contrast of 92% in the experimental implementation.

Suggested Citation

  • S. van Frank & A. Negretti & T. Berrada & R. Bücker & S. Montangero & J.-F. Schaff & T. Schumm & T. Calarco & J. Schmiedmayer, 2014. "Interferometry with non-classical motional states of a Bose–Einstein condensate," Nature Communications, Nature, vol. 5(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5009
    DOI: 10.1038/ncomms5009
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