Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 7: Bosonic Quantum Gases II (joint session Q/A)
A 7.5: Talk
Monday, March 11, 2024, 18:00–18:15, Aula
Site-resolved current and kinetic energy measurements using optical superlattices — •Alexander Impertro1,2,3, Simon Karch1,2,3, Julian Wienand1,2,3, SeungJung Huh1,2,3, Christian Schweizer1,2,3, Immanuel Bloch1,2,3, and Monika Aidelsburger1,2,3 — 1Department of Physics, Ludwig-Maximilians-Universität München, Schellingstr. 4, D-80799 Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), 80333 Munich — 3Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
Quantum gas microscopes naturally realize a measurement of the particle number density in an optical lattice. Further information about the underlying quantum state can only be obtained by measuring additional, complementary observables. Here, we demonstrate how optical superlattice potentials can be used to measure the expectation values of the current and the kinetic energy operator. Our scheme is based on driving programmable rotations in isolated double wells to rotate the measurement basis in an arbitrary direction. Furthermore, we show that a local control enables to perform spatially varying rotations, which can be used both to read out complex correlators as well as to engineer interesting quantum states. The presented scheme will pave the way for a more flexible state tomography and state engineering in optical lattices, and in particular to detect exotic quantum many-body phases that have no signatures in the density.
Keywords: quantum simulation; current measurement; optical lattices; state tomography; state engineering