Ulrich Warring
Research Associate
Gustav-Mie-Building; Room: 04 017
T 7645
+49 761 203
E ulrich.warring
[at] physik.uni-freiburg.de
My research journey has taken me through various esteemed institutions: At the Max-Planck-Institute for Nuclear Physics in Heidelberg, I delved into high-resolution laser spectroscopy on the osmium anion. My interests then expanded at the University of Colorado and the National Institute of Standards and Technology in Boulder, USA, where I explored microwave quantum control of trapped ions. Now, in Freiburg, I'm developing advanced quantum control techniques, working alongside the team led by Tobias Schaetz. We focus on demonstrations of methodologies applicable in quantum metrology, simulation and computation. We are working towards ultimate control in artificial quantum systems, build-up atom by atom.
Teaching and mentoring gotten closer to my heart since I am in Freiburg. Over the years, I've organized seminars, mentored both undergraduate and graduate students in lab work, and contributed to beginners and advanced experimental physics courses. I value the exchange of ideas and knowledge, and I'm always eager to collaborate and learn from fellow researchers and students.
Please don't hesitate to connect with me.
Research
Bermuda |
Paula |
DiamondOne |
- Advanced Lab Course for B.Sc. and M.Sc. programs – since 2014 (link)
- Lab class for the applied M.Sc. program – since 2018 (link)
- Atomic Physics: From Nobel Prizes to Applications – Term Paper of the M.Sc. Physics and Applied Physics – Winter 2021/2022 (link)
- Aufzucht von Schrödinger's Kätzchen: Vom Gedankenexperiment zur vollen Quantenkontrolle von einzelnen Atomen – Seminar für B.Sc. – Sommer 2020 (link)
Publications
- F. Hasse, D. Palani, R.Thomm, U. Warring, T. Schaetz, Phase-Stable Traveling Waves Stroboscopically Matched for Super-Resolved Observation of Trapped-Ion Dynamics, IN REVIEW – http://arxiv.org/abs/2309.15580 (2023)
- D. Palani, F. Hasse, P. Kiefer, F. Boeckling, J.-P. Schroeder, U. Warring, and T.Schaetz, High-fidelity transport of trapped-ion qubits in a multilayer array Phys. Rev. A 107, L050601 (2023)
- M. Wittemer, J.-P. Schröder, F. Hakelberg, P. Kiefer, C. Fey, R. Schuetzhold, U. Warring, T. Schaetz, Trapped-ion toolkit for studies of quantum harmonic oscillators under extreme conditions Philosophical Transactions of the Royal Society A, 378:20190230 (2020)
- U. Warring, F. Hakelberg, P. Kiefer, M. Wittemer, T. Schaetz, Trapped Ion Architecture for Multi‐Dimensional Quantum Simulations Adv. Quantum Technol. 2020, 1900137
- P. Kiefer, F. Hakelberg, M. Wittemer, A. Bermúdez, D. Porras, U. Warring, T. Schaetz, Floquet-engineered vibrational dynamics in a two-dimensional array of trapped ions Phys. Rev. Lett. 123, 213605 (2019)- arXiv:1907.06376 (2019)
- M. Wittemer, F. Hakelberg, P. Kiefer, J.-P. Schröder, C. Fey, R. Schützhold, U. Warring, T. Schaetz, Phonon pair creation by inflating quantum fluctuations in an ion trap Phys. Rev. Lett. 123, 180502 (2019) - arXiv:1903.05523 (2019)
- F. Hakelberg, P. Kiefer, M. Wittemer, U. Warring, T. Schaetz, Interference in a Prototype of a two-dimensional Ion Trap Array Quantum Simulator Phys.Rev.Lett 123 100504 (2019) - arXiv:1812.0855
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F. Hakelberg, P. Kiefer, M. Wittemer, T. Schaetz, U. Warring, Hybrid setup for stable magnetic fields enabling robust quantum control Sci. Rep. 8, 4404 (2018) - arXiv:1710.10092 (2017)
- M. Wittemer, G. Clos, H.-P. Breuer, U. Warring, T. Schaetz, Measurement of quantum memory effects and its fundamental limitations Phys. Rev. A 97, 020102(R) (2018) - arXiv: 1702.07518 (2017)
- G. Clos, D. Porras, U. Warring, and T. Schaetz, Time-resolved observation of thermalization in an isolated quantum system, Phys. Rev. Lett. 117, 170401 (2016)
- H. Kalis, F. Hakelberg, M. Wittemer, M. Mielenz, U. Warring, and T. Schaetz, Motional-mode analysis of trapped ions, Phys.Rev.A 94, 023401 (2016)
- M. Mielenz, H. Kalis, M. Wittemer, F. Hakelberg, R. Schmied, M. Blain, P. Maunz, D.L. Moehring, D. Leibfried, U. Warring, and T. Schaetz, Arrays of individually controlled ions suitable for two-dimensional quantum simulations, Nat. Commun. 7, 11839 (2016)
- A. Kellerbauer, A. Fischer, and U. Warring, Measurement of the Zeeman effect in an atomic anion: Prospects for laser cooling of Os−, Phys. Rev. A 89 , 043430 (2014).
- G. Clos, M. Enderlein, U. Warring, T. Schaetz, and D. Leibfried, Decoherence-assisted spectroscopy of a single Mg+ ion, Phys. Rev. Lett. 112 , 113003 (2014).
- U. Warring, C. Ospelkaus, Y. Colombe, R. Jördens, D. Leibfried, and D.J. Wineland, Individual-ion addressing with microwave field gradients,Phys. Rev. Lett. 110 , 173002 (2013).
- C. L. Arrington, K. S. McKay, E. D. Baca, J. J. Coleman, Y. Colombe, P. Finnegan, D. A. Hite, A. E. Hollowell, R. Jördens, J. D. Jost, D. Leibfried, A. M. Rowen, U. Warring, M. Weides, A. C. Wilson, D. J. Wineland, and D. P. Pappas, Micro-fabricated stylus ion trap, Rev. Sci. Instrum. 84, 085001 (2013).
- R. Bowler, U. Warring, J. W. Britton, B. C. Sawyer, and J. Amini, Arbitrary waveform generator for quantum information processing with trapped ions, Rev. Sci. Instrum. 84 , 033108 (2013).
- U. Warring, C. Ospelkaus, Y. Colombe, K.R. Brown, J.M. Amini, M. Carsjens, D. Leibfried, and D.J. Wineland, Techniques for microwave near-field quantum control of trapped ions, Phys. Rev. A 87 , 013437 (2013).
- D.A. Hite, Y. Colombe, A.C. Wilson, K.R. Brown, U. Warring, R. Jördens, J.D. Jost, K.S. McKay, D.P. Pappas, D. Leibfried, and D.J. Wineland, 100-Fold Reduction of Electric-Field Noise in an Ion Trap Cleaned with In-Situ Argon-Ion-Beam Bombardment,Phys. Rev. Lett. 109 , 103001 (2012).
- C. Ospelkaus, U. Warring, Y. Colombe, K.R. Brown, J.M. Amini, D. Leibfried, and D.J. Wineland,Microwave quantum logic gates for trapped ions, Nature 476 , 181184 (2011).
- A. Kellerbauer, C. Canali, A. Fischer, U. Warring, and S. Fritzsche, Isotope shift of the electric-dipole transition in Os-, Phys. Rev. A 84 , 062510 (2011).
- P. Gross, I. D. Lindsay, C. J. Lee, M. Nittmann, T. Bauer, J. Bartschke,U. Warring, A. Fischer, A. Kellerbauer, and K.-J. Boller, Frequency control of a 1163 nm singly resonant OPO based on MgO:PPLN,Opt. Lett. 35 , 820 (2010).
- A. Fischer, C. Canali, U. Warring, A. Kellerbauer, and S. Fritzsche, First Optical Hyperfine Structure Measurement in an Atomic Anion, Phys. Rev. Lett. 104 , 073004 (2010).
- U. Warring, M. Amoretti, C. Canali, A. Fischer, R. Heyne, J.O. Meier, C. Morhard, and A. Kellerbauer,High-Resolution Laser Spectroscopy on the Neg. Osmium Ion, Phys. Rev. Lett. 102 , 043001 (2009).
- M. Kowalska, S. Naimi, J. Agramunt, A. Algora, G. Audi, D. Beck, B. Blank, K. Blaum, C. Bhm, M. Breitenfeldt, E. Estevez, L. M. Fraile, S. George, F. Herfurth, A. Herlert, A. Kellerbauer, D. Lunney, E. Minaya-Ramirez, D. Neidherr, B. Olaizola, K. Riisager, M. Rosenbusch, B. Rubio, S. Schwarz, L. Schweikhard, and U. Warring, Preparing a journey to the east of 208Pb with ISOLTRAP: Isobaric purication at A = 209 and new masses for 211-213Fr and 211Ra, Eur. Phys. J. A 42 , 351 (2009).
- A. Kellerbauer, M. Amoretti, A.S. Belov, G. Bonomi, I. Boscolo, R.S. Brusa, M. Buchner, V.M. Byakov, L. Cabaret, C. Canali, C. Carraro, F. Castelli, S. Cialdi, M. de Combarieu, D. Comparat, G. Consolati, N. Djourelov, M. Doser, G. Drobychev, A. Dupasquier, G. Ferrari, P. Forget, L. Formaro, A. Gervasini, M.G. Giammarchi, S.N. Gninenko, G. Gribakin, S.D. Hogan, M. Jacquey, V. Lagomarsino, G. Manuzio, S. Mariazzi, V.A. Matveev, J.O. Meier, F. Merkt, P. Nedelec, M.K. Oberthaler, P. Pari, M. Prevedelli, F. Quasso, A. Rotondi, D. Sillou, S.V. Stepanov, H.H. Stroke, G. Testera, G.M. Tino, G. Trenec, A. Vairo d, J. Vigue, H. Walters, U. Warring, S. Zavatarelli, and D.S. Zvezhinskij, Proposed antimatter gravity measurement with an antihydrogen beam, Nucl. Instrum. Meth. B 266 , 351 (2008).
Popular Science Article
- C. Ospelkaus, U. Warring, und Y. Colombe, Qubits in der Mikrowelle, Physik in Unserer Zeit 45, 72 (2014).
- Workshop for Quantum Simulations of Open Quantum Systems, A FRIAS Junior Research Conference, 13.-15. Nov. 2013, in collaboration with Florian Mintert (http://www.frias.uni-freiburg.de/qsoqs).