Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 40: Poster: Quantum Computation: Hardware Platforms

FM 40.5: Poster

Dienstag, 24. September 2019, 16:30–18:30, Tents

Static and dynamic quantum speed limit of single neutral atoms in optical lattices — •Manolo Rivera1, Thorsten Groh1, Natalie Peter1, Jan Uckert1, Gal Ness4, Carsten Robens1, Wolfgang Alt1, Dieter Meschede1, Antonio Negretti2, Tommaso Calarco3, Simone Montagero3, and Andrea Alberti11Institut für Angewandte Physik, Bonn, Germany — 2Zentrum für Optische Quantentechnologien, Hamburg, Germany — 3Institut für komplexe Quantensysteme, Ulm, Germany — 4Physics Department, Technion - IIT, Haifa, Israel

We report on fast, high-fidelity transport of single atoms in spin-dependent optical lattices with a high-precision polarization synthesizer, which allows us to displace the lattice potentials with angstrom precision. The transport sequences computed from quantum optimal control theory are believed to reach the fundamental speed limit of our optical lattice system (dynamical quantum speed limit), corresponding to one lattice site in  30µ s. During transport operations close to the quantum speed limit the atoms are excited, but are then refocused to the ground state at the end of the transport. This is confirmed by measuring the fraction of atoms in the ground state after transport using a novel detection scheme based on microwave sideband spectroscopy. Our transport sequences preserve the coherence of the two spin states, this has been shown by single atom interferometry. Additionally we verify the Mandelstam-Tamm inequality which poses a lower bound to the time evolution between an initial state to an orthogonal state in the static lattice (static quantum speed limit).

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