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DTSTART;TZID=Europe/Berlin:20250508T100000
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CREATED:20250508T130905Z
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SUMMARY:Atomic Cooperative Arrays: Bio Inspired Quantum Optics and Quantum Chemistry on Neutral Atom Array Quantum Computers
DESCRIPTION:Colloquium by Susanne Yelin\, Physics Department\, Harvard University\, Cambridge\, United States of America \nTuesday\, 08. May and Friday\, 09.May 2025 \nLUH\, Building 3406\, Room 317\, Callinstr. 36\, 30167 Hannover \nAbstract: \nWhat is the potential of dense — cooperative — emitter arrays? These arrays\, already known for their use in metrology and quantum information as efficient waveguides and mirrors\, are now being studied in alternative geometries. Inspired by nature\, we investigate chiral and helical structures\, as well as ring‑shaped arrays.\nIn addition\, we introduce a digital‑analog simulation framework for strongly correlated spin models using reconfigurable qubit arrays. Our toolbox — built on Floquet engineering and hardware‑optimized multi‑qubit gates — enables programmable real‑time Hamiltonian evolution\, with an implementation proposal on Rydberg atom platforms. By combining snapshot measurements and single‑ancilla control\, we extract excitation spectra and finite‑temperature susceptibilities from a single dataset. We illustrate this approach by computing key catalytic energy levels in a polynuclear transition‑metal complex and magnetic response in a two‑dimensional spin lattice. \nAccess data for the transfer:\nZoom Access: https://us04web.zoom.us/j/932734874
URL:https://qvls.de/event/atomic-cooperative-arrays-bio-inspired-quantum-optics-and-quantum-chemistry-on-neutral-atom-array-quantum-computers/2025-05-08/
LOCATION:Niedersachsen
CATEGORIES:Bildung
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DTSTART;TZID=Europe/Berlin:20250508T160000
DTEND;TZID=Europe/Berlin:20250508T173000
DTSTAMP:20260525T092842
CREATED:20250508T131139Z
LAST-MODIFIED:20250508T131139Z
UID:10002244-1746720000-1746725400@qvls.de
SUMMARY:Searching for new physics by measuring isotope shifts and parity violation in trapped ions
DESCRIPTION:Colloquium by Diana Prado Lopes Aude Craik\, ETH\, Zürich\, Switzerland \nPTB Braunschweig\, Vieweg- Bau\, Room 234\, Braunschweig \nTitle: Searching for new physics by measuring isotope shifts and parity violation in trapped ions \nAbstract: \nIsotope shift (IS) spectroscopy of atoms and ions has been proposed as a method to search for a fifth fundamental force mediated by a hypothetical new boson in the intermediate mass range (100eV to 10MeV). The existence of this force would cause neutron-number-dependent (and hence\, isotope dependent) shifts in atomic transition frequencies. To distinguish these shifts from standard model (SM) shifts (relating\, for example\, to differences in the Coulomb potential of the nucleus between isotopes)\, one measures isotopes shifts on at least two transitions between three or more distinct pairs of isotopes. The data can then be plotted on a „King plot“\, which displays a nonlinearity if physics beyond first-order SM effects has contributed to the measured isotope shifts. \nAt the TIQI group at ETH\, we measured isotope shifts on the 729nm electric quadrupole transition between pairs of co-trapped calcium ions at 100mHz precision\, two orders of magnitude below the previous best measurement. We combined our measurements with IS measurements made by the group of Piet Schmidt on the 570nm transition in Ca14+ and improved nuclear mass measurements made by the group of Klaus Blaum\, to produce the first sub-Hz King plot [1]. King plots in calcium had previously remained linear up to the 10Hz level — our improved precision now reveals a large King non-linearity. Whilst the second-order mass shift is an expected SM source of nonlinearity\, a decomposition analysis of the nonlinearity pattern\, combined with input from our theory collaborators\, reveals evidence for at least one other contributing source. I will discuss the implications of these results both to our understanding of nuclear structure and to the search for new physics. \nFinally\, I will outline an endeavor I am now starting in my new group at ETH to perform a stringent test of the electroweak sector of the Standard Model by measuring parity violation in barium ions using entanglement-enhanced spectroscopy [2]. \n[1] A. Wilzewski et al.\, https://arxiv.org/abs/2412.10277 (2024)\n[2] D. P. L. Aude Craik\, https://arxiv.org/abs/2503.20003 (2025) \nAccess data for the transfer:\nZoom Access: https://us04web.zoom.us/j/932734874\nThis talk is part of the „Virtual Seminar on Precision Physics and Fundamental Symmetries“ series and of the SFB DQ-mat colloquium series: https://indico.cern.ch/category/12183/
URL:https://qvls.de/event/searching-for-new-physics-by-measuring-isotope-shifts-and-parity-violation-in-trapped-ions/
LOCATION:Niedersachsen
CATEGORIES:Bildung
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