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X-WR-CALNAME:QVLS | Quantum Valley Lower Saxony
X-ORIGINAL-URL:https://qvls.de
X-WR-CALDESC:Veranstaltungen für QVLS | Quantum Valley Lower Saxony
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260108T160000
DTEND;TZID=Europe/Berlin:20260108T173000
DTSTAMP:20260407T051225
CREATED:20260108T173111Z
LAST-MODIFIED:20260108T173832Z
UID:10002661-1767888000-1767893400@qvls.de
SUMMARY:Trapped ion spectroscopy using tweezers and an ultracold buffer gas
DESCRIPTION:Colloquium by Rene Gerritsma (University van Amsterdam\, Niederlande) at PTB Braunschweig\, Vieweg- Bau\, Room 133\, 38116 Braunschweig \nOptical tweezers offer new opportunities to control and manipulate trapped ions with applications in quantum information processing\, metrology and precision spectroscopy [1-3]. I will highlight our experimental progress towards implementing this system in the lab with emphasis on optimizing tweezer delivery and eliminating aberrations by using a single ion as a probe [4]. The ion of choice is Yb+\, which possesses a complex level structure owing to large configuration interactions and spin-orbit coupling. We identify several optical transitions and metastable states that were not studied in single ions before and examine their use in laser cooling\, quantum information\, precision spectroscopy and atomic clocks [5\,6]. Finally\, we use an ultracold atomic buffer gas to perform spectroscopy on ions that may not be directly laser cooled. The buffer gas is used both for hyperfine structure-resolved state preparation and detection in the isotopes 171Yb+ and 173Yb+ to demonstrate the principle. I will discuss how the scheme may be extended to more complex ions [7]. \n[1] J. D. Arias Espinoza et al.\, Phys. Rev. A 104\, 013302 (2021).\n[2] M. Mazzanti et al.\, Phys. Rev. Research 5\, 033036 (2023).\n[3] L.P.H. Gallagher et al.\, arXiv:2502.19345 (2025).\n[4] M. Mazzanti et al.\, Phys. Rev. A 110\, 043105 (2024).\n[5] N. Diepeveen et al.\, Phys. Rev. A 110\, 042809 (2024).\n[6] Z.E.D. Ackerman et al.\, in prep.\n[7] E. Kovlakov et al.\, in prep. \nAccess data for the transfer: \nZoom Access: https://us04web.zoom.us/j/932734874
URL:https://qvls.de/event/trapped-ion-spectroscopy-using-tweezers-and-an-ultracold-buffer-gas/
CATEGORIES:Bildung
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260113T140000
DTEND;TZID=Europe/Berlin:20260113T153000
DTSTAMP:20260407T051225
CREATED:20260108T173318Z
LAST-MODIFIED:20260108T173807Z
UID:10002662-1768312800-1768318200@qvls.de
SUMMARY:Quantum technologies with trapped ions: From quantum computing to quantum sensing
DESCRIPTION:Colloquium by Ass.-Prof. Dr. Philipp Schindler (Universität Innsbruck\, Österreich) at PTB Braunschweig\, Vieweg- Bau\, Room 133\, 38116 Braunschweig  \nTrapped ions are one of the most mature platforms for quantum technologies. In this talk\, I will summarize our work on building compact and scalable quantum computing demonstrators. In these systems\, we implement proof of concept experiments for quantum error correction. I will further present applications for quantum enhanced sensing of forces that act on single ions for molecular spectroscopy as well as for electron microscopy. \nAccess data for the transfer: \nZoom Access: https://us04web.zoom.us/j/932734874
URL:https://qvls.de/event/quantum-technologies-with-trapped-ions-from-quantum-computing-to-quantum-sensing/
CATEGORIES:Bildung
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260115T100000
DTEND;TZID=Europe/Berlin:20260115T110000
DTSTAMP:20260407T051225
CREATED:20260108T174039Z
LAST-MODIFIED:20260108T174039Z
UID:10002663-1768471200-1768474800@qvls.de
SUMMARY:Quantum Control of a single H2+ molecular ion
DESCRIPTION:Colloquium by Dr. Daniel Kienzler (ETH Zürich\, Schweiz) at PTB Braunschweig\, Kohlrausch- Bau\, Hörsaal Room 135\, 38116 Braunschweig \nAbstract: \nI will present our latest results\, implementing pure quantum state preparation\, coherent manipulation\, and non-destructive state readout of the hydrogen molecular ion H2+ [1]. The hydrogen molecular ion is the simplest stable molecule\, and its structure can be calculated ab initio to high precision. However\, challenging properties such as high reactivity\, low mass\, and the absence of rovibrational dipole transitions have thus far strongly limited spectroscopic studies of H2+.  \nWe trap a single H2+ molecule together with a single beryllium ion using a cryogenic Paul trap apparatus\, achieving trapping lifetimes of 11 h and ground-state cooling of the shared axial motion [2]. With this platform\, we have recently implemented Quantum Logic Spectroscopy of H2+. We utilize helium buffer-gas cooling or 2+1 REMPI to prepare selected rotational states of H2+ in its vibrational ground state. We combine this with quantum-logic operations between the molecule and the beryllium ion for the preparation of single hyperfine states and non-destructive readout\, achieving a combined state-preparation and readout fidelity of 66.5(8)%. We demonstrate Rabi flopping on several hyperfine transitions using stimulated Raman transitions and microwaves.  I will further present recent progress on high-precision hyperfine spectroscopy of ortho-H2+ (rotation L=1\, vibration ν=0)\, where we achieve a precision of 50 mHz with a 6-minute averaging time and estimate a preliminary accuracy on the order of 100 mHz. This could provide a stringent test of state-of-the-art molecular theory and put an improved bound on a possible new tensor force between the two constituent protons of H2+ [3].  \nOur results pave the way for many high-precision spectroscopy studies of H2+\, which would enable tests of QED\, metrology of fundamental constants\, and the implementation of an optical molecular clock based on the simplest molecule in nature.    \n1. D. Holzapfel et al.\, Phys. Rev. X 15\, 031009 (2025). \n2. N. Schwegler et al.\, Phys. Rev. Lett. 131\, 133003 (2023). \n3. N. F. Ramsey\, Physica 96A\, 285 (1979). \nAccess data for the transfer: \nZoom Access: https://us04web.zoom.us/j/932734874
URL:https://qvls.de/event/quantum-control-of-a-single-h2-molecular-ion/
CATEGORIES:Bildung
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260115T141500
DTEND;TZID=Europe/Berlin:20260115T160000
DTSTAMP:20260407T051225
CREATED:20260109T114041Z
LAST-MODIFIED:20260109T114041Z
UID:10002664-1768486500-1768492800@qvls.de
SUMMARY:Vortrag: Topology in multi-terminal superconducting structures
DESCRIPTION:by Wolfgang Belzig\nDepartment of Physics\, University of Konstanz \nSeminarraum 268\nAppelstraße 2\,\n30167 Hannover
URL:https://qvls.de/event/vortrag-topology-in-multi-terminal-superconducting-structures/
LOCATION:Appelstraße 2\, 30167 Hannover\, Appelstraße 2\, Hannover\, Lower Saxony\, 30167\, Germany
CATEGORIES:Bildung,DE,Forschung
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260123T160000
DTEND;TZID=Europe/Berlin:20260123T170000
DTSTAMP:20260407T051225
CREATED:20260116T132418Z
LAST-MODIFIED:20260119T104220Z
UID:10002665-1769184000-1769187600@qvls.de
SUMMARY:Virtual talk by Carlo Rovelli: The Relational Interpretation of Quantum Mechanics
DESCRIPTION:The student´s initiative for Inclusion\, Support\, and Exchange QVLS RISE announces their kick-off event\, featuring a virtual talk by the renowned theoretical physicist:\nThe Relational Interpretation of Quantum Mechanics\nRovelli is a professor of theoretical physics at the University of Aix Marseille and widely known for developing the relational interpretation of quantum mechanics (https://link.springer.com/article/10.1007/BF02302261). In his 45min talk\, he will introduce the key ideas behind this interpretation and discuss its implications. \nBeyond his influential contributions to Loop Quantum Gravity\, Rovelli is also celebrated for bridging physics and philosophy\, offering profound insights into how we approach and understand nature. Furthermore\, he is well-known for his distinguished ability to communicate abstract topics from theoretical physics to a broad audience\, reflected also by his bestseller books ”The order of time’’  and ”Seven brief lessons on physics’’. \nPlease register via the form on https://qvls.de/en/rise/ to get the WebEx meeting link! \nImage: By Fronteiras do Pensamento – Carlo Rovelli no Fronteiras do Pensamento São Paulo 2017\, CC BY-SA 2.0\, https://commons.wikimedia.org/w/index.php?curid=62518717
URL:https://qvls.de/event/virtual-talk-by-carlo-rovelli-the-relational-interpretation-of-quantum-mechanics/
CATEGORIES:Bildung,Forschung
ATTACH;FMTTYPE=image/jpeg:https://qvls.de/wp-content/uploads/2026/01/carlo-rovelli-no-fronteiras-do-pensamento-sao-paulo-2017-34781380545.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260129T160000
DTEND;TZID=Europe/Berlin:20260129T173000
DTSTAMP:20260407T051225
CREATED:20260123T110405Z
LAST-MODIFIED:20260213T140408Z
UID:10002667-1769702400-1769707800@qvls.de
SUMMARY:A Laser Cooled Primary Cesium Clock in Space
DESCRIPTION:Colloquium by Christophe Salomon – Laboratoire Kastler Brossel\, France\nAbstract: \nOn April 21\, 2025\, the Atomic Clock Ensemble in Space (ACES) was launched towards the International Space Station by a SpaceX Falcon rocket. Within one week\, the ACES payload was installed on an external platform of the European module Columbus and turned on by the ACES control center located in CNES Toulouse (FR) via the Columbus and ISS control centers. \nACES is an ESA-CNES fundamental physics mission carrying two atomic clocks\, a cold atom clock\, PHARAO\, designed for operating in microgravity\, and a Space Hydrogen Maser (SHM). These clocks are connected to a worldwide network of microwave or optical clocks in national metrology institutes with advanced time transfer systems\, operating either in the microwave domain or in the optical domain with short laser pulses. The ACES mission is currently in the commissioning phase\, where the onboard clocks and time transfer links are turned on and characterized. \nIn this talk\, we will start by recalling the scientific objectives of the mission and give the current status of the main instruments. We will present the first signals of the PHARAO clock in microgravity and preliminary frequency comparisons with cesium and rubidium fountain clocks located at Paris Observatory. The commissioning phase will end with the full deployment and operation of 7 ground terminals located on three continents\, four in Europe (PTB\, NPL\, Paris Observatory\, Wetzell Observatory)\, two in the USA (JPL and NIST) and one in Japan (NICT). \nIntercontinental time and frequency comparisons of microwave and optical clocks with increased accuracy as compared to GPS time comparison systems will enable new tests in fundamental physics and provide additional support for a future redefinition of the second based on optical clocks. \nLocation: Leibniz University Hannover\, Building 1101\, Room D326\, Welfengarten 1\, 30167 Hannover\, Germany \nAccess data for the transfer: \nZoom Access: https://us04web.zoom.us/j/932734874
URL:https://qvls.de/event/a-laser-cooled-primary-cesium-clock-in-space/
CATEGORIES:Bildung,Forschung
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260129T183000
DTEND;TZID=Europe/Berlin:20260129T203000
DTSTAMP:20260407T051225
CREATED:20260126T095940Z
LAST-MODIFIED:20260126T100230Z
UID:10002668-1769711400-1769718600@qvls.de
SUMMARY:Start der Reihe „Science Talk 2026“ im phaeno: Quantum World to Play Along
DESCRIPTION:Wir freuen uns\, den Start der Reihe „Science Talk 2026“ bei der phaeno gGmbH zu unterstützen\, die mit der Veranstaltung „Quantum World to Play Along“ eröffnet wird. \nReferentin ist Prof. Dr. Stefanie Kroker vom Institut für Halbleitertechnik der Technischen Universität Braunschweig. In ihrem Vortrag zeigt sie\, wie komplexe Quantenforschung in greifbare Technologien umgesetzt und einem breiteren Publikum zugänglich gemacht werden kann. \nDer Science Talk findet bei der phaeno gGmbH statt und wird in Zusammenarbeit mit dem Volkswagen Konzern organisiert. Gemeinsam schaffen die Partner einen Raum für den offenen Austausch zwischen Forschung\, Industrie und Öffentlichkeit. \nBei QVLS | Quantum Valley Lower Saxony unterstützen wir nachdrücklich Formate\, die Spitzenforschung sichtbar\, verständlich und diskutierbar machen. Veranstaltungen wie die Science Talk-Reihe spielen eine wichtige Rolle dabei\, wissenschaftliches Fachwissen mit der Gesellschaft zu verbinden und Studierende\, Absolventen und Wissenschaftsbegeisterte gleichermaßen zu inspirieren. \nDie Science Talk-Reihe ist auch 2026 offen für neue Beiträge. Forscher\, die ihre Arbeit einem breiten Publikum vorstellen möchten\, werden gebeten\, sich mit Tatevik Oganisyan in Verbindung zu setzen. \n29. Januar 2026 | 18:30 Uhr \nphaeno Science Theater \nDer science talk wird hybrid in Präsenz und als Youtube-Livestream angeboten\, um sie auch einem breiteren interessierten Publikum außerhalb der Region zugänglich zu machen. \nDer Eintritt ist frei und eine Anmeldung ist nicht erforderlich.
URL:https://qvls.de/event/start-der-reihe-science-talk-2026-im-phaeno-quantum-world-to-play-along/
CATEGORIES:Bildung
ATTACH;FMTTYPE=image/jpeg:https://qvls.de/wp-content/uploads/2026/01/phaeno-science-talk-29-januar-2026.jpeg
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