Foreword
Dear Ion Trappers,
We’re truly grateful for the ongoing engagement from the iontrap community, who keep the conversation lively by sharing their latest news, events, jobs, publications, and editorials. Visit the ITN-Website (https://iontraps.net/) where you can download the current and archived issues and send us your submissions and events directly using the forms. Please continue to send us your thoughts; your contributions make our newsletter vibrant and enriching.
Events
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.
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
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 fully funded, 3.5-year PhD position is available in the Ion Trap Cavity-QED and Molecular Physics (ITCM) Group in the Department of Physics & Astronomy at the University of Sussex.
Contact: Prof Matthias Keller (m.k.keller@sussex.ac.uk).
Details
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
Comparing Shor and Steane error correction using the Bacon-Shor code
SHILIN HUANG, KENNETH R. BROWN, AND MARKO CETINA
SCIENCE ADVANCES
6 Nov 2024
Vol 10, Issue 45
Coriolis forces modify magnetostatic ponderomotive potentials
E. J. Kolmes, N. J. Fisch
Journal: Physics of Plasmas
Phys. Plasmas 31, 112107 (2024)
Cooling Trapped Ions with Phonon Rapid Adiabatic Passage
M. I. Fabrikant, P. Lauria, I. S. Madjarov, W. C. Burton, and R. T. Sutherland
Phys. Rev. X 14, 041046 (2024)
Coupling Trapped Ions to a Nanomechanical Oscillator
Moritz Weegen, Martino Poggio, and Stefan Willitsch
Phys. Rev. Lett. 133, 223201 (2024)
Digital-analog counterdiabatic quantum optimization with trapped ions
Shubham Kumar, Narendra N Hegade, Murilo Henrique de Oliveira, Enrique Solano, Alejandro Gomez Cadavid and F Albarrán-Arriagada
2025 Quantum Sci. Technol. 10 015023
Efficient digitized counterdiabatic quantum optimization algorithm within the impulse regime for portfolio optimization
Alejandro Gomez Cadavid, Iraitz Montalban, Archismita Dalal, Enrique Solano, and Narendra N. Hegade
Phys. Rev. Applied 22, 054037 (2024)
Enhancement of nonclassical properties of the two-mode squeezed vacuum state with a postselected von Neumann measurement
Janarbek Yuanbek, Yi-Fang Ren, Ahmad Abliz, and Yusuf Turek
Phys. Rev. A 110, 052611 (2024) –
How to Move Multiple Ions in Two Dimensions
Mark Buchanan
Physics 17, 159, November 1, 2024•
Individually addressed entangling gates in a two-dimensional ion crystal
Y.-H. Hou, Y.-J. Yi, Y.-K. Wu, Y.-Y. Chen, L. Zhang, Y. Wang, Y.-L. Xu, C. Zhang, Q.-X. Mei, H.-X. Yang, J.-Y. Ma, S.-A. Guo, J. Ye, B.-X. Qi, Z.-C. Zhou, P.-Y. Hou & L.-M. Duan
Nature Communications volume 15, Article number: 9710 (2024)
Low-crosstalk optical addressing system for atomic qubits based on multiple objectives and acoustooptic deflectors
Yi-Long Chen (陈一龙), Rui-Rui Li (李睿睿), Ran He (贺冉), Shu-Qian Chen (陈树谦), Wen-Hao Qi (亓文昊), Jin-Ming Cui (崔金明), Yun-Feng Huang (黄运锋), Chuan-Feng Li (李传锋), and Guang-Can Guo (郭光灿)
Phys. Rev. Applied 22, 054003 (2024)
Motional-state analysis of a trapped ion by ultranarrowband composite pulses
Marion Mallweger, Milena Guevara-Bertsch, Boyan T. Torosov, Robin Thomm, Natalia Kuk, Harry Parke, Christan F. Roos, Gerard Higgins, Markus Hennrich, and Nikolay V. Vitanov
Phys. Rev. A 110, 053103 (2024)
Open quantum dynamics with variational non-Gaussian states and the truncated Wigner approximation
Liam J. Bond, Bas Gerritsen, Jiří Minář, Jeremy T. Young, Johannes Schachenmayer, Arghavan Safavi-Naini
Journal: The Journal of Chemical Physics
J. Chem. Phys. 161, 184113 (2024)
Optimal quantum sensing of the nonlinear bosonic interactions using Fock states
Payman Mahmoudi, Atirach Ritboon, and Radim Filip
Phys. Rev. Research 6, 043215 (2024)
Quadratic Zeeman and electric quadrupole shifts in highly charged ions
Jan Gilles, Stephan Fritzsche, Lukas J. Spieß, Piet O. Schmidt, and Andrey Surzhykov
Phys. Rev. A 110, 052812 (2024)
Scalable Multispecies Ion Transport in a Grid-Based Surface-Electrode Trap
Robert D. Delaney, Lucas R. Sletten, Matthew J. Cich, Brian Estey, Maya I. Fabrikant, David Hayes, Ian M. Hoffman, James Hostetter, Christopher Langer, Steven A. Moses, Abigail R. Perry, Timothy A. Peterson, Andrew Schaffer, Curtis Volin, Grahame Vittorini, and William Cody Burton
Phys. Rev. X 14, 041028 (2024)
The behavior of a string of trapped 40Ca+ ions in a linear Paul system
Basem R. Kazem, Mezher B. Saleh
Journal: AIP Conference Proceedings
AIP Conf. Proc. 3219, 060003 (2024)
Preprints
A silicon-based ion trap chip protected from semiconductor charging
Authors: Daun Chung, Kwangyeul Choi, Woojun Lee, Chiyoon Kim, Hosung Shon, Jeonghyun Park, Beomgeun Cho, Kyungmin Lee, Suhan Kim, Seungwoo Yoo, Eui Hwan Jung, Changhyun Jung, Jiyong Kang, Kyunghye Kim, Roberts Berkis, Tracy Northup, Dong-Il “Dan” Cho, Taehyun Kim
Analysis of the confinement string in (2 + 1)-dimensional Quantum Electrodynamics with a trapped-ion quantum computer
Authors: Arianna Crippa, Karl Jansen, Enrico Rinaldi
Anomalous velocity distributions in slow quantum-tunneling chemical reactions
Authors: Christian Beck, Constantino Tsallis
Associative ionization in a dilute ultracold 7Li gas probed with a hybrid trap
Authors: N. Joshi, Vaibhav Mahendrakar, M. Niranjan, Raghuveer Singh Yadav, E Krishnakumar, A. Pandey, R Vexiau, O. Dulieu, S. A. Rangwala
Cooperative engineering the multiple radio-frequency fields to reduce the X-junction barrier for ion trap chips
Authors: Yarui Liu, Zhao Wang, Zixuan Xiang, Qikun Wang, Tianyang Hu, Xu Wang
Enhancing non-destructive mass identification via Fourier-transform fluorescence analysis
Authors: F. Domínguez, D. Yousaf, J. Berrocal, M. J. Gutiérrez, J.
Sánchez, M. Block, and D. Rodríguez.
Entanglement teleportation along a regenerating hamster-wheel graph state
Authors: Haiyue Kang, John F. Kam, Gary J. Mooney, Lloyd C. L. Hollenberg
Experimental evidence for dipole-phonon quantum logic in a trapped calcium monoxide and calcium ion chain
Authors: Lu Qi, Evan C. Reed, Boyan Yu, Kenneth R. Brown
High-fidelity entanglement of metastable trapped-ion qubits with integrated erasure conversion
Authors: A. Quinn, G. J. Gregory, I. D. Moore, S. Brudney, J. Metzner, E. R. Ritchie, J. O’Reilly, D. J. Wineland, D. T. C. Allcock
Impact of micromotion on the excitation of Rydberg states of ions in a Paul trap
Authors: Wilson S. Martins, Joseph W. P. Wilkinson, Markus Hennrich, Igor Lesanovsky
Integrated-Photonics-Based Systems for Polarization-Gradient Cooling of Trapped Ions
Authors: Sabrina M. Corsetti, Ashton Hattori, Ethan R. Clements, Felix W. Knollmann, Milica Notaros, Reuel Swint, Tal Sneh, Patrick T. Callahan, Gavin N. West, Dave Kharas, Thomas Mahony, Colin D. Bruzewicz, Cheryl Sorace-Agaskar, Robert McConnell, Isaac L. Chuang, John Chiaverini, Jelena Notaros
Multiplexed bi-layered realization of fault-tolerant quantum computation over optically networked trapped-ion modules
Authors: Nitish K. Chandra, Saikat Guha, Kaushik P. Seshadreesan
Non-Classicality and Non-adiabaticity in a Single Trapped Ion
Authors: C. F. P. Avalos, M. C. de Oliveira
Noise-Aware Circuit Compilations for a Continuously Parameterized Two-Qubit Gateset
Authors: Christopher G. Yale, Rich Rines, Victory Omole, Bharath Thotakura, Ashlyn D. Burch, Matthew N. H. Chow, Megan Ivory, Daniel Lobser, Brian K. McFarland, Melissa C. Revelle, Susan M. Clark, Pranav Gokhale
On-Chip Verified Quantum Computation with an Ion-Trap Quantum Processing Unit
Authors: Cica Gustiani, Dominik Leichtle, Daniel Mills, Jonathan Miller, Ross Grassie, Elham Kashefi
Quadratic Zeeman and Electric Quadrupole Shifts in Highly Charged Ions
Authors: Jan Gilles, Stephan Fritzsche, Lukas J. Spieß, Piet O. Schmidt, Andrey Surzhykov
Quantum metrology with a continuous-variable system
Authors: Matteo Fadel, Noah Roux, Manuel Gessner
Qutrit Toric Code and Parafermions in Trapped Ions
Authors: Mohsin Iqbal, Anasuya Lyons, Chiu Fan Bowen Lo, Nathanan Tantivasadakarn, Joan Dreiling, Cameron Foltz, Thomas M. Gatterman, Dan Gresh, Nathan Hewitt, Craig A. Holliman, Jacob Johansen, Brian Neyenhuis, Yohei Matsuoka, Michael Mills, Steven A. Moses, Peter Siegfried, Ashvin Vishwanath, Ruben Verresen, Henrik Dreyer
Reshaping quantum device noise via quantum error correction
Authors: Yue Ma, Michael Hanks, Evdokia Gneusheva, M. S. Kim
State-dependent control of the motional modes of trapped ions using an integrated optical lattice
Authors: Alfredo Ricci Vasquez, Carmelo Mordini, Daniel Kienzler, Jonathan Home
Sub-Doppler cooling of a trapped ion in a phase-stable polarization gradient
Authors: Ethan Clements, Felix W. Knollmann, Sabrina Corsetti, Zhaoyi Li, Ashton Hattori, Milica Notaros, Reuel Swint, Tal Sneh, May E. Kim, Aaron D. Leu, Patrick Callahan, Thomas Mahony, Gavin N. West, Cheryl Sorace-Agaskar, Dave Kharas, Robert McConnell, Colin D. Bruzewicz, Isaac L. Chuang, Jelena Notaros, John Chiaverini
Study of decoherence in radial local phonon hopping within trapped-ion string
Authors: Yu-Xuan Chen, Takumi Yuri, Kenji Toyoda
Super-Heisenberg scaling of the quantum Fisher information using spin-motion states
Authors: Venelin P. Pavlov, Peter A. Ivanov
Towards quantum computing Feynman diagrams in hybrid qubit-oscillator devices
Authors: S. Varona, S. Saner, O. Băzăvan, G. Araneda, G. Aarts, A. Bermudez
Trapped-ion laser cooling in structured light fields
Authors: Zhenzhong Xing, Karan K. Mehta
Trapped-ion quantum simulation of the Fermi-Hubbard model as a lattice gauge theory using hardware-aware native gates
Authors: Dhruv Srinivasan, Alex Beyer, Daiwei Zhu, Spencer Churchill, Kushagra Mehta, Sashank Kaushik Sridhar, Kushal Chakrabarti, David W. Steuerman, Nikhil Chopra, Avik Dutt
Ultracold Interactions between Ions and Polar Molecules
Authors: Leon Karpa, Olivier Dulieu
Unsupervised Quantum Anomaly Detection on Noisy Quantum Processors
Authors: Daniel Pranjić, Florian Knäble, Philipp Kunst, Damian Kutzias, Dennis Klau, Christian Tutschku, Lars Simon, Micha Kraus, Ali Abedi
Warehouse optimization using a trapped-ion quantum processor
Authors: Alexandre C. Ricardo, Gabriel P. L. M. Fernandes, Amanda G. Valério, Tiago de S. Farias, Matheus da S. Fonseca, Nicolás A. C. Carpio, Paulo C. C. Bezerra, Christine Maier, Juris Ulmanis, Thomas Monz, Celso J. Villas-Boas