Foreword
Dear Ion Trappers,
As we wrap up 2024, we’d like to thank all our members for staying in touch and sharing their news, events, publications, and opportunities with us throughout the year. Your contributions are what make this newsletter a vibrant hub for our community. Looking ahead, 2025 has been officially declared the International Year of Quantum Science and Technology by the United Nations, marking the centenary of quantum mechanics and celebrating its transformative impact. We’re eager to hear about your projects and events—keep writing to us! You can visit the ITN website (https://iontraps.net/) to download current and archived issues and send us your submissions directly using the provided forms. Wishing all the ion trappers a joyful holiday season and an exciting start to the new year!
Events
The International Conference on Quantum Technology for High-Energy Physics (QT4HEP 2025), will be held at CERN Main Auditorium and Science Gateway from January 20 to 24, 2025. Details
The TII Quantum Technology Symposium will take place at the Hilton Abu Dhabi Yas Island from January 27 to 29, 2025. Details
The Multiparameter Quantum Sensing and Metrology Seminar will be held at the Physics Center in Bad Honnef, Germany, from February 3 to 6, 2025. Detail
The Winter School for Quantum Information Processing with Trapped Ions will take place in Hannover, Germany from February 24 to 28, 2025. Send your application mit optional letter of recommendation from a supervisor/teacher/professor to info@qvls.de by January 19th, 2025. Speakers to include Klemens Hammerer, Tobias Osborne, Christian Ospelkaus and Robert Raußendorf.
The 88th Annual Conference of the DPG and DPG Spring Meeting (SAMOP) will take place on the campus of the University of Bonn from March 9 to 14, 2025. Details
The 26th International Conference on Laser Spectroscopy (ICAPS March Meeting) will be held as a hybrid event online and in Anaheim, California from March 16 to 21, 2025. Details
The Joint Conference of the IEEE, IFCS & EFTF will be held in Querétaro, Mexico, from May 12 to 16, 2025. Details
The 10th International Conference on Precision Physics and Fundamental Physical Constants (FFK2025) will be held at the University of Warsaw in Poland from May 26 to 30, 2025. Details
The 26th International Conference on Laser Spectroscopy (ICOLS 2025) will take place on the Elba Island in Tuscany, Italy, from June 2 to 7, 2025. Details
The 56th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics (DAMOP) will be held in Portland, Oregon from June 16 to 20, 2025. Details
The 27th Laser World of Photonics will take place in Munich, Germany from June 24 to 27, 2025. Details
The 15th European Conference on Atoms Molecules and Photons (ECAMP15) will take place in Innsbruck, Austria from June 30 to July 4 2025. Details
The Summer School on Quantum Matter out of Equilibrium will be held in Granada (Spain) from September 1st to 5th 2025. Details
European Conference on Trapped Ions (ECTI) will be held in the Netherlands from 8 to 12 September 2025. Details to follow.
The 2nd DPG Fall Meeting on Quantum Physics will take place in Göttingen, Germany from September 8 to 12, 2025. Details
Online Seminars
Virtual Seminar on Precision Physics and Fundamental Symmetries – LINK: Thursdays
The “Virtual AMO Seminar” – LINK: Fridays, 7 pm (UTC)
The “Quantum Science Seminar” – LINK: Thursdays, 5 pm
Jobs
IonQ is seeking an experienced ion trapper to work on ion trap technology in our College Park, MD, USA office. The position requires being on site in Maryland and authorization to work in the USA.
Contact: David Scherer at scherer@ionq.co
Details
Highly motivated PhD students and postdoctoral researchers are sought to join the experiments and theory team of the ERC Synergy project “Open 2D Quantum Simulator (OPEN-2QS)”, with the project starting on May 1st, 2025.Trapped ions excited to Rydberg states will be used to build a quantum simulator for open system quantum dynamics, enabling the study of novel states of matter like quantum glasses through fast interactions and long-time stability.
Contacts: Mainz (experiment), Ferdinand Schmidt-Kaler (fsk@uni-mainz.de)
Stockholm (experiment), Markus Hennrich (markus.hennrich@fysik.su.se)
Tübingen (theory), Igor Lesanovsky (igor.lesanovsky@uni-tuebingen.de)
Details
Senior Theoretical Scientist (QEC) – A full-time position with Oxford Ionics, either based in Oxford or remotely in Europe. Play a key role in developing and refining the QEC strategies for our cutting-edge trapped-ion quantum computing systems.
Contact: Elliot Dower (elliot.dower@oxionics.com).
Details
A 12-month post-doctoral position is available at the Time and Frequency department at FEMTO-ST in Besançon.
Contact: Clément Lacroûte, clement.lacroute@femto-st.fr
Details
The Trapped Ion Quantum Information group at ETH Zürich is seeking for post-doctoral and PhD researchers across a range of topics in the group, but focussed particularly in the areas of Penning Trap Quantum Computing, Quantum Metrology of Hydrogen Molecular Ions, and Multi-Zone Trapped Ion Quantum Information. The TIQI group welcomes applications from underrepresented groups, as well as from a diverse range of backgrounds, in particular from outside the direct realm of trapped ions.
Contact: tiqi-application@lists.phys.ethz.ch.
A 3-year postdoc position available in collaboration with Prof. Steve Worm’s group at the DESYin Zeuthen to work on optical clocks
Contact: Steven Worm (steven.worm@desy.de).
Details
For a 3-year postdoc opportunity at MIT & Texas A&M, the NEPTUNE project [PRL 133, 033003 (2024)] seeks candidates with hands-on experience in Penning traps.
Contact: Jonas Karthein (karthein@tamu.edu).
Details
Several PostDoc and PhD positions available at PTB in Braunschweig and Leibniz University Hannover in the Quantum Logic Spectroscopy Group of Piet Schmidt . Topics include laboratory and transportable aluminium ion clocks, multi-ion calcium clock using dynamical decoupling and entanglement, as well as highly charged ion clocks.
Contact: Dr. Piet Schmidt (Piet.Schmidt@quantummetrology.de)
PhD and postdoc positions available at the University of Basel (Switzerland) on the topics of developing molecular-ion quantum technologies for precision measurements as well as cold ion-neutral interactions and collisions.
Contact: stefan.willitsch@unibas.ch
Details
PhD and postdoc positions available in the group of Tanja Mehlstäubler at PTB, working on optical clocks based on trapped ion Coulomb crystals. Topics include new interrogation protocols for multi-ensemble clocks, quantum-enhanced clock operation, ground-state cooling of mixed-species Coulomb crystals and tests of fundamental physics with precision spectroscopy.
Contact: Prof. Dr. Tanja Mehlstäubler (tanja.mehlstaeubler@quantummetrology.de).
Details
Multiple postdoc positions are available in the NIST Ion Storage Group in Colorado, USA. Topics include quantum simulation and sensing in a Penning trap, trapped-ion quantum computing, trapped-ion optical clocks, and quantum state control and precision spectroscopy of single molecular ions.
Contact: John Bollinger or any of the NIST Ion Storage group staff
Details
The research group of C. Ospelkaus at the University of Hannover is looking for a postdoctoral research associate on their Penning trap experiment, which aims to implement quantum logic spectroscopy of (anti-) protons for tests of the fundamental CPT symmetry as part of the BASE collaboration.
Contact: Dr. Christian Ospelkaus (christian.ospelkaus@iqo.uni-hannover.de)
A postdoc position is available at the Old Dominion University in Norfolk, Virginia, USA on a project trapping lutetium ions for precision measurements.
Contact: Dr. Matt Grau (mgrau@odu.edu).
two openings for PhD positions in the Molecular Systems group headed by Roland Wester at the University of Innsbruck. One position is part of a research project in collaboration with the University of Bordeaux on classical versus quantum effects in three-body collisions of cold trapped ions, funded through the Austrian Science Fund (FWF). The second position is part of a collaborative project on controlling
trapped charged nanoparticles, funded through the Austrian excellence cluster QuantA.
Contact: Prof. Dr. Roland Wester (roland.wester@uibk.ac.at).
Details
The Imperial College Particle Physics Group has a postgraduate studentship available to work on laser measurements of cold exotic helium atoms that contain antiprotons at the new ELENA facility of CERN in Geneva. This allows us to probe the matter-antimatter symmetry and determine the mass ratio between an antiproton and electron. We hope to be relatively flexible with regards to the exact PhD topic depending on the candidate’s interests. The studentship covers a maintenance bursary similar to standard STFC studentships.
Contact: m.hori@imperial.ac.uk
Publications
Benchmarking Bosonic Modes for Quantum Information with Randomized Displacements
Christophe H. Valahu, Tomas Navickas, Michael J. Biercuk, and Ting Rei Tan
PRX Quantum 5, 040337 (2024)
Characterization of ion-trap-induced ac magnetic fields
Manoj K. Joshi, Milena Guevara-Bertsch, Florian Kranzl, Rainer Blatt, and Christian F. Roos
Phys. Rev. A 110, 063101 (2024)
Domain formation and structural stabilities in mixed-species Coulomb crystals induced by sympathetically cooled highly charged ions
L.-A. Rüffert, E. A. Dijck, L. Timm, J. R. Crespo López-Urrutia, and T. E. Mehlstäubler
Phys. Rev. A 110, 063110 (2024)
Experiments with the four-dimensional surface code on a quantum charge-coupled device quantum computer
Noah Berthusen, Joan Dreiling, Cameron Foltz, John P. Gaebler, Thomas M. Gatterman, Dan Gresh, Nathan Hewitt, Michael Mills, Steven A. Moses, Brian Neyenhuis, Peter Siegfried, and David Hayes
Phys. Rev. A 110, 062413 (2024)
Fermi Polaron in Atom-Ion Hybrid Systems
Renato Pessoa, S. A. Vitiello, and L. A. Peña Ardila
Phys. Rev. Lett. 133, 233002 (2024)
Fractal ground state of mesoscopic ion chains in periodic potentials
Raphaël Menu, Jorge Yago Malo, Vladan Vuletić, Maria Luisa Chiofalo, and Giovanna Morigi
Phys. Rev. B 110, 224103 (2024)
Hardware-efficient variational quantum algorithm in a trapped-ion quantum computer
J.-Z. Zhuang, Y.-K. Wu, and L.-M. Duan
Phys. Rev. A 110, 062414 (2024)
Ion-mediated interaction and controlled-phase-gate operation between two atomic qubits
Subhra Mudli, Subhanka Mal, Sinchan Snigdha Rej, Anushree Dey, and Bimalendu Deb
Phys. Rev. A 110, 062618 (2024)
Laser-assisted motional-mode spectroscopy in a Penning trap and the generalized invariance theorem
J. Berrocal, A. Hernández, D. Porras, and D. Rodríguez
Phys. Rev. A 110, 063107 (2024) –
Phonon-mediated quantum gates in trapped ions coupled to an ultracold atomic gas
Lorenzo Oghittu, Arghavan Safavi-Naini, Antonio Negretti, and Rene Gerritsma
Phys. Rev. A 110, 063307 (2024) –
Precision determination of the oscillating-magnetic-field-induced second-order Zeeman shift of a single- 40 Ca + -ion optical clock
Zixiao Ma, Baolin Zhang, Yao Huang, Ruming Hu, Mengyan Zeng, Kelin Gao, and Hua Guan
Phys. Rev. A 110, 063102 (2024)
Probing Critical States of Matter on a Digital Quantum Computer
Reza Haghshenas, Eli Chertkov, Matthew DeCross, Thomas M. Gatterman, Justin A. Gerber, Kevin Gilmore, Dan Gresh, Nathan Hewitt, Chandler V. Horst, Mitchell Matheny, Tanner Mengle, Brian Neyenhuis, David Hayes, and Michael Foss-Feig
Phys. Rev. Lett. 133, 266502 (2024)
Solving an Industrially Relevant Quantum Chemistry Problem on Quantum Hardware
Ludwig Nützel, Alexander Gresch, Lukas Hehn, Lucas Marti, Robert Freund, Alex Steiner, Christian Marciniak, Timo Eckstein, Nina Stockinger, Stefan WolfShow full author list
2024 Quantum Sci. Technol.
Thermometry of trapped ions based on bichromatic driving
Xie-Qian Li, Yi Tao, Ting Chen, Wei Wu, Yi Xie, Chun-Wang Wu, and Ping-Xing Chen
Phys. Rev. Applied 22, 064022 (2024)
Trapped-ion quantum simulation of electron transfer models with tunable dissipation
VISAL SO, MIDHUNA DURAISAMY SUGANTHI, ABHISHEK MENON, MINGJIAN ZHU, ROMAN ZHURAVEL, PETER G. WOLYNES, JOSÉ N. ONUCHIC
SCIENCE ADVANCES 20 Dec 2024 Vol 10, Issue 51
Preprints
A 3-dimensional scanning trapped-ion probe
Authors: Tobias Sägesser, Shreyans Jain, Pavel Hrmo, Alexander Ferk, Matteo Simoni, Yingying Cui, Carmelo Mordini, Daniel Kienzler, Jonathan Home
An Optical Interconnect for Modular Quantum Computers
Authors: Daisuke Sakuma, Amin Taherkhani, Tomoki Tsuno, Toshihiko Sasaki, Hikaru Shimizu, Kentaro Teramoto, Andrew Todd, Yosuke Ueno, Michal Hajdušek, Rikizo Ikuta, Rodney Van Meter, Shota Nagayama
BOSS: Blocking algorithm for optimizing shuttling scheduling in Ion Trap
Authors: Xian Wu, Chenghong Zhu, Jingbo Wang, Xin Wang
Coherent enhancement of collection of light from linear ion crystals
Authors: T. D. Tran, D. Babjak, A. Kovalenko, K. Singh, M. T. Pham, P. Obšil, A. Lešundák, O. Číp, L. Slodička
Complete Rabi oscillations in the ion-laser interaction
Authors: M. A. García-Márquez, H. M. Moya-Cessa, I. Ramos-Prieto, F. Soto-Eguibar
Detection states of ions in a Paul trap via conventional and quantum machine learning algorithms
Authors: Ilia Khomchenko, Andrei Fionov, Artem Alekseev, Daniil Volkov, Ilya A. Semerikov, Nikolay N. Kolachevsky, Aleksey K. Fedorov
Development of a High-Voltage Output DAC System for Fast Ion-Shuttling
Authors: T. Oshio, R. Nishimoto, T. Higuchi, K. Hayasaka, K. Koike, S. Morisaka, T. Miyoshi, R. Ohira, U. Tanaka
Dynamical Aharonov-Bohm cages and tight meson confinement in a Z2-loop gauge theory
Authors: Enrico C. Domanti, Alejandro Bermudez, Luigi Amico
Fast mixed-species quantum logic gates for trapped-ion quantum networks
Authors: Zain Mehdi, Varun D. Vaidya, Isabelle Savill-Brown, Phoebe Grosser, Alexander K. Ratcliffe, Haonan Liu, Simon A. Haine, Joseph J. Hope, C. Ricardo Viteri
Fault-Tolerant Implementation of the Deutsch-Jozsa Algorithm
Authors: Divyanshu Singh, Shiroman Prakash
Measurements and simulations of rate coefficients for the deuterated forms of the H2 + + H2 and H3 + + H2 reactive systems at low temperature
Authors: Miguel Jiménez-Redondo, Olli Sipilä, Pavol Jusko, Paola Caselli
Observing dynamical localization on a trapped-ion qudit quantum processor
Authors: Gonzalo Camacho, Claire L. Edmunds, Michael Meth, Martin Ringbauer, Benedikt Fauseweh
Perfect revivals of Rabi oscillations and hybrid Bell states in a trapped ion
Authors: Juan Mauricio Torres, Christian Ventura-Velázquez, Ivan Arellano-Melendez
Power-optimized amplitude modulation for robust trapped-ion entangling gates: a study of gate-timing errors
Authors: Luke Ellert-Beck, Wenchao Ge
Precise Determination of Excited State Rotational Constants and Black-Body Thermometry in Coulomb Crystals of Ca+ and CaH+
Authors: Swapnil Patel, Kenneth R. Brown
Probing Entanglement Scaling Across a Quantum Phase Transition on a Quantum Computer
Authors: Qiang Miao, Tianyi Wang, Kenneth R. Brown, Thomas Barthel, Marko Cetina
Programmable simulation of high-order exceptional point with a trapped ion
Authors: Yue Li, Yang Wu, Yuqi Zhou, Mengxiang Zhang, Xingyu Zhao, Yibo Yuan, Xu Cheng, Yi Li, Xi Qin, Xing Rong, Yiheng Lin, Jiangfeng Du
Quantum circuit and mapping algorithms for wavepacket dynamics: case study of anharmonic hydrogen bonds in protonated and hydroxide water clusters
Authors: Debadrita Saha, Philip Richerme, Srinivasan S. Iyengar
Quantum computation over the vibrational modes of a single trapped ion
Authors: Alexandre C. Ricardo, Gubio G. de Lima, Amanda G. Valério, Tiago de S. Farias, Celso J. Villas-Boas
Quantum computing architecture with Rydberg gates in trapped ions
Authors: Han Bao, Jonas Vogel, Ulrich Poschinger, Ferdinand Schmidt-Kaler
Quantum-Enhanced Multi-Parameter Sensing in a Single Mode
Authors: Christophe H. Valahu, Matthew P. Stafford, Zixin Huang, Vassili G. Matsos, Maverick J. Millican, Teerawat Chalermpusitarak, Nicolas C. Menicucci, Joshua Combes, Ben Q. Baragiola, Ting Rei Tan
Quantum Frequency Conversion of μs-long Photons from the Visible to the Telecom-C-Band
Authors: Soeren Wengerowsky, Stefano Duranti, Lukas Heller, Hugues de Riedmatten
Quantum tomography of a third-order exceptional point in a dissipative trapped ion
Authors: Y. -Y. Chen, K. Li, L. Zhang, Y. -K. Wu, J. -Y. Ma, H. -X. Yang, C. Zhang, B. -X. Qi, Z. -C. Zhou, P. -Y. Hou, Y. Xu, L. -M. Duan
Single-qubit gates with errors at the 10−7 level
Authors: M. C. Smith, A. D. Leu, K. Miyanishi, M. F. Gely, D. M. Lucas
Spin Phonon Relaxation Dynamics from a Conical Intersection of Trapped Rydberg Ions
Authors: Manish Chaudhary, Rejish Nath, Weibin Li
Two-qubit gate protocols with microwave-dressed Rydberg ions in a linear Paul trap
Authors: Joseph W. P. Wilkinson, Katrin Bolsmann, Thiago L. M. Guedes, Markus Müller, Igor Lesanovsky