Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 40: Poster: Quantum Computation: Hardware Platforms

FM 40.5: Poster

Tuesday, September 24, 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 Alberti¹ — ¹Institut 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).