Foreword

Dear Ion Trappers,
as mentioned in our last issue, Frontiers in Quantum Science and Technology has announced a special issue on “Micromotion in Trapped Ion Systems.” Submissions are now open. For more details and submission guidelines, visit Frontiers in Quantum Science and Technology.
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

Quantum Physics with Trapped Particles at Monte Verita, close to Ascona, Switzerland, on October 13-18, 2024. Details

Atomic Clock Ensemble in Space (ACES) Workshop, ESTEC, the Netherlands from the 23rd to the 25th of October 2024 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

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

AC Zeeman effect in microfabricated surface traps
M. Ivory, C. D. Nordquist, K. Young, C. W. Hogle, S. M. Clark, M. C. Revelle
Rev. Sci. Instrum. 95, 093202 (2024)

Concatenated Steane code with single-flag syndrome checks
Balint Pato, Theerapat Tansuwannont, and Kenneth R. Brown
Phys. Rev. A 110, 032411 (2024)

Crosstalk suppression of parallel gates for fault-tolerant quantum computation with trapped ions via optical tweezers
Lin Cheng, Sheng-Chen Liu, Liang-You Peng, and Qihuang Gong
Phys. Rev. Applied 22, 034021 (2024) –

Dressing trapped ions with integrated wires
R. T. Sutherland
Phys. Rev. A 110, 033116 (2024) – Published 24 September 2024

Elastic splitting of x-ray photon by an atomic ion
A N Hopersky, A M Nadolinsky and S A Novikov
2024 J. Phys. B: At. Mol. Opt. Phys. 57 215601

Electromagnetically Induced Transparency Cooling of High-Nuclear-Spin Ions
Chuanxin Huang, Chenxi Wang, Hongxuan Zhang, Hongyuan Hu, Zuqing Wang, Zhichao Mao, Shijiao Li,
Panyu Hou, Yukai Wu, Zichao Zhou, and Luming Duan
Phys. Rev. Lett. 133, 113204 (2024) –

Enhanced micromotion compensation using a phase-modulated light field
K. J. Arnold, N. Jayjong, M. L. D. Kang, Qin Qichen, Zhao Zhang, Qi Zhao, and M. D. Barrett
Phys. Rev. A 110, 033115 (2024)

Error mitigation, optimization, and extrapolation on a trapped-ion testbed
Oliver G. Maupin, Ashlyn D. Burch, Brandon Ruzic, Christopher G. Yale, Antonio Russo, Daniel S. Lobser, Melissa C. Revelle, Matthew N. Chow, Susan M. Clark, Andrew J. Landahl, and Peter J. Love
Phys. Rev. A 110, 032416 (2024)

Exactly solvable model of light-scattering errors in quantum simulations with metastable trapped-ion qubits
Phillip C. Lotshaw, Brian C. Sawyer, Creston D. Herold, and Gilles Buchs
Phys. Rev. A 110, L030803 (2024) –

Fast Photon-Mediated Entanglement of Continuously Cooled Trapped Ions for Quantum Networking
Jameson O’Reilly, George Toh, Isabella Goetting, Sagnik Saha, Mikhail Shalaev, Allison L. Carter, Andrew Risinger, Ashish Kalakuntla, Tingguang Li, Ashrit Verma, and Christopher Monroe
Phys. Rev. Lett. 133, 090802 (2024) –

Fundamental physics and other applications using nonneutral plasma,
G. Maero, E. D. Hunter, D. J. Murtagh and E. V. Stenson,
Adv. Phys: X 9, 1 (2024)

High-accuracy measurements of core-excited transitions in light Li-like ions
Moto Togawa, Steffen Kühn, Chintan Shah, Vladimir A. Zaytsev, Natalia S. Oreshkina, Jens Buck, Sonja Bernitt, René Steinbrügge, Jörn Seltmann, Moritz Hoesch, Christoph H. Keitel, Thomas Pfeifer, Maurice A. Leutenegger, and José R. Crespo López-Urrutia
Phys. Rev. A 110, L030802 (2024)

High-fidelity teleportation of a logical qubit using transversal gates and lattice surgery
C. Ryan-Anderson*, N. C. Brown, C. H. Baldwin, J. M. Dreiling, C. Foltz, J. P. Gaebler, T. M. Gatterman,
N. Hewitt, C. Holliman, C. V. Horst, J. Johansen, D. Lucchetti, T. Mengle, M. Matheny, Y. Matsuoka,
K. Mayer, M. Mills, S. A. Moses, B. Neyenhuis, J. Pino, P. Siegfried, R. P. Stutz, J. Walker, D. Hayes
SCIENCE, Vol 385, Issue 6715 pp. 1327-1331, 19 Sep 2024

Homodyne quadrature laser interferometry for the characterization of low-frequency residual vibrational noise in cryogenic trapped-ion systems
Qin, Qingqing; Ou, Baoquan; Wu, Wei; Xie, Yi; Chen, Ting; Wu, Chunwang; Chen, Pingxing
2024
open access Optics Express 32(21) 36586-36599

Integrated photonic structures for photon-mediated entanglement of trapped ions
Knollmann, F. W.; Clements, E.; Callahan, P. T.; Gehl, M.; Hunker, J. D.; Mahony, T.; McConnell, R.; Swint, R.; Sorace-Agaskar, C.; Chuang, I. L.; Chiaverini, J.; Stick, D.
2024
open access Optica Quantum 2(4) 230-244

Large-scale simulations of Floquet physics on near-term quantum computers
Timo Eckstein, Refik Mansuroglu, Piotr Czarnik, Jian-Xin Zhu, Michael J. Hartmann, Lukasz Cincio, Andrew T. Sornborger & Zoë Holmes
npj Quantum Information volume 10, Article number: 84 (2024)

Logical quantum circuits protected by the Steane code for specific noises in trapped ions
Sheng-Chen Liu, Lin Cheng, Liang-You Peng, and Qihuang Gong
Phys. Rev. Applied 22, 034020 (2024

Low-excitation transport and separation of high-mass-ratio mixed-species ion chains
F. Lancellotti, S. Welte, M. Simoni, C. Mordini, T. Behrle, B. de Neeve, M. Marinelli, V. Negnevitsky, and J. P. Home
Phys. Rev. Research 6, L032059 (2024) –

Long-lifetime optical trapping of a 40Ca+ ion
Zheng Chen, Miao Wang, Baolin Zhang, Huaqing Zhang, Zixiao Ma, Ruming Hu, Yao Huang, Kelin Gao and Hua Guan
2024 Chinese Phys. Lett.

Nonlinear dynamics as a ground-state solution on quantum computers
Albert J. Pool, Alejandro D. Somoza, Conor Mc Keever, Michael Lubasch, and Birger Horstmann
Phys. Rev. Research 6, 033257 (2024) –

Noise-Aware Variational Eigensolvers: A Dissipative Route for Lattice Gauge Theories
Jesús Cobos, David F. Locher, Alejandro Bermudez, Markus Müller, and Enrique Rico
PRX Quantum 5, 030340 (2024)

Quantum repeater node with free-space coupled trapped ions
Max Bergerhoff, Omar Elshehy, Stephan Kucera, Matthias Kreis, and Jürgen Eschner
Phys. Rev. A 110, 032603 (2024)

Relativistic effects on entangled single-electron traps
Marko Toroš, Patrick Andriolo, Martine Schut, Sougato Bose, and Anupam Mazumdar
Phys. Rev. D 110, 056031 (2024) –

Resolved-sideband cooling of a single 9 Be + ion in a cryogenic multi-Penning-trap for discrete symmetry tests with (anti-)protons
Juan M. Cornejo, Johannes Brombacher, Julia A. Coenders, Moritz von Boehn, Teresa Meiners, Malte Niemann, Stefan Ulmer, and Christian Ospelkaus
Phys. Rev. Research 6, 033233 (2024)

Scalable electronic control of trapped-ion qubits
Malinowski, Maciej; Allcock, David T. C.; Srinivas, Raghavendra; Löschnauer, Clemens M.; Hughes, Amy C.; Nourshargh, Rustin; Negnevitsky, Vlad; King, Steven A.; Matthiesen, Clemens; Harty, Thomas P.; Ballance, Christopher J.
2024
Quantum 2.0, Paper# QM3A.4

Scaling of entangling-gate errors in large ion crystals
Wenhao He, Wenhao Zhang, Xiao Yuan, Yangchao Shen and Xiao-Ming Zhang
2024 J. Phys. A: Math. Theor. 57 375306

Stochastic resonance via single-ion phonon laser
Q. Yuan, S.-Q. Dai, P.-D. Li, Y.-Q. Wei, J. Li, F. Zhou, J.-Q. Zhang, L. Chen, M. Feng
Journal: Applied Physics Letters
Appl. Phys. Lett. 125, 102201 (2024)

Toward a Mølmer Sørensen gate with .9999 fidelity
Reinhold Blümel, Andrii Maksymov and Ming Li
2024 J. Phys. B: At. Mol. Opt. Phys. 57 205501

Trapped-atom Otto engine with light-induced dipole–dipole interactions
Chimdessa Gashu Feyisa and H H Jen
2024 New J. Phys. 26 093039

Two-Qubit Operations for Finite-Energy Gottesman-Kitaev-Preskill Encodings
Ivan Rojkov, Paul Moser Röggla, Martin Wagener, Moritz Fontboté-Schmidt, Stephan Welte, Jonathan Home, and Florentin Reiter
Phys. Rev. Lett. 133, 100601 (2024) –

Unitary collapse of Schrödinger’s cat state
Pavel Stránský, Pavel Cejnar, and Radim Filip
Phys. Rev. A 110, L030202 (2024)

Preprints

Coherent dynamics of a nuclear-spin-isomer superposition
Tamar Levin, Ziv Meir

Competing excitation quenching and charge exchange in ultracold Li-Ba+ collisions
Xiaodong Xing, Pascal Weckesser, Fabian Thielemann, Tibor Jónás, Romain Vexiau, Nadia Bouloufa-Maafa, Eliane Luc-Koenig, Kirk W. Madison, Andrea Orbán, Ting Xie, Tobias Schaetz, Olivier Dulieu

Contributions to the study of time dependent oscillators in Paul traps. Semiclassical approach
Authors: Bogdan M. Mihalcea

Demonstration of quantum computation and error correction with a tesseract code
Authors: Ben W. Reichardt, David Aasen, Rui Chao, Alex Chernoguzov, Wim van Dam, John P. Gaebler, Dan Gresh, Dominic Lucchetti, Michael Mills, Steven A. Moses, Brian Neyenhuis, Adam Paetznick, Andres Paz, Peter E. Siegfried, Marcus P. da Silva, Krysta M. Svore, Zhenghan Wang, Matt Zanner

Experimental measurement and a physical interpretation of quantum shadow enumerators
Authors: Daniel Miller, Kyano Levi, Lukas Postler, Alex Steiner, Lennart Bittel, Gregory A. L. White, Yifan Tang, Eric J. Kuehnke, Antonio A. Mele, Sumeet Khatri, Lorenzo Leone, Jose Carrasco, Christian D. Marciniak, Ivan Pogorelov, Milena Guevara-Bertsch, Robert Freund, Rainer Blatt, Philipp Schindler, Thomas Monz, Martin Ringbauer, Jens Eisert

Experimental Quantum Simulation of Chemical Dynamics
Authors: T. Navickas, R. J. MacDonell, C. H. Valahu, V. C. Olaya-Agudelo, F. Scuccimarra, M. J. Millican, V. G. Matsos, H. L. Nourse, A. D. Rao, M. J. Biercuk, C. Hempel, I. Kassal, T. R. Tan

Discovery of a new long-lived isomer in 114Rh via Penning-trap mass spectrometry
Authors: M. Stryjczyk, A. Jaries, W. Ryssens, M. Bender, A. Kankainen, T. Eronen, Z. Ge, I. D. Moore, M. Mougeot, A. Raggio, J. Ruotsalainen

Entanglement-enhanced quantum sensing via optimal global control
Authors: Vineesha Srivastava, Sven Jandura, Gavin K Brennen, Guido Pupillo

Efficient fault-tolerant code switching via one-way transversal CNOT gates
Authors: Sascha Heußen, Janine Hilder

Entanglemons: Cross-platform protected qubits from entanglement
Authors: Nilotpal Chakraborty, Roderich Moessner, Benoit Doucot

Experimental Demonstration of Break-Even for the Compact Fermionic Encoding
Authors: Ramil Nigmatullin, Kevin Hemery, Khaldoon Ghanem, Steven Moses, Dan Gresh, Peter Siegfried, Michael Mills, Thomas Gatterman, Nathan Hewitt, Etienne Granet, Henrik Dreyer

Generating arbitrary superpositions of nonclassical quantum harmonic oscillator states
Authors: S. Saner, O. Băzăvan, D. J. Webb, G. Araneda, D. M. Lucas, C. J. Ballance, R. Srinivas

Graph-Based Pulse Representation for Diverse Quantum Control Hardware
Authors: Aniket S. Dalvi, Leon Riesebos, Jacob Whitlow, Kenneth R. Brown

High-fidelity heralded quantum state preparation and measurement
Authors: A. S. Sotirova, J. D. Leppard, A. Vazquez-Brennan, S. M. Decoppet, F. Pokorny, M. Malinowski, C. J. Ballance

How to integrate a miniature optical cavity in a linear ion trap: shielding dielectrics and trap symmetry
Authors: Ezra Kassa, Shaobo Gao, Soon Teh, Dyon van Dinter, Hiroki Takahashi

Hybrid Oscillator-Qubit Quantum Processors: Simulating Fermions, Bosons, and Gauge Fields
Authors: Eleanor Crane, Kevin C. Smith, Teague Tomesh, Alec Eickbusch, John M. Martyn, Stefan Kühn, Lena Funcke, Michael Austin DeMarco, Isaac L. Chuang, Nathan Wiebe, Alexander Schuckert, Steven M. Girvin

Investigating the effects of precise mass measurements of Ru and Pd isotopes on machine learning mass modeling
Authors: W. S. Porter, B. Liu, D. Ray, A. A. Valverde, M. Li, M. R. Mumpower, M. Brodeur, D. P. Burdette, N. Callahan, A. Cannon, J. A. Clark, D. E. M. Hoff, A. M. Houff, F. G. Kondev, A. E. Lovell, A. T. Mohan, G. E. Morgan, C. Quick, G. Savard, K. S. Sharma, T. M. Sprouse, L. Varriano

Ion-mediated interaction and controlled phase gate operation between two atomic qubits
Authors: Subhra Mudli, Subhanka Mal, Sinchan Snigdha Rej, Anushree Dey, Bimalendu Deb

Ion Trapping with a Laser-written 3D Miniaturized Monolithic Linear Paul Trap for Microcavity Integration
Authors: Soon Teh, Ezra Kassa, Shaobo Gao, Shuma Oya, Hiroki Takahashi

Loop Algorithm for Quantum Transverse Ising Model in a Longitudinal Field
Authors: Wei Xu, Xue-Feng Zhang

Measuring Correlation and Entanglement between Molecular Orbitals on a Trapped-Ion Quantum Computer
Authors: Gabriel Greene-Diniz, Chris N. Self, Michal Krompiec, Luuk Coopmans, Marcello Benedetti, David Muñoz Ramo, Matthias Rosenkranz

Modular variable laser cooling for efficient entropy extraction
Authors: Brennan de Neeve, Thanh-Long Nguyen, Alexander Ferk, Tanja Behrle, Francesco Lancellotti, Matteo Simoni, Stephan Welte, Jonathan Home

Observing Time-Dependent Energy Level Renormalisation in an Ultrastrongly Coupled Open System
Authors: Alessandra Colla, Florian Hasse, Deviprasath Palani, Tobias Schaetz, Heinz-Peter Breuer, Ulrich Warring

Optimizing Qubit Control Pulses for State Preparation
Authors: Annika S. Wiening, Joern Bergendahl, Vicente Leyton-Ortega, Peter Nalbach

Performance of Quantum Approximate Optimization with Quantum Error Detection
Authors: Zichang He, David Amaro, Ruslan Shaydulin, Marco Pistoia

Phonon-mediated quantum gates in trapped ions coupled to an ultracold atomic gas
Authors: Lorenzo Oghittu, Arghavan Safavi-Naini, Antonio Negretti, Rene Gerritsma

Progress in Trapped-Ion Quantum Simulation
Authors: Michael Foss-Feig, Guido Pagano, Andrew C. Potter, Norman Y. Yao

Quantum control of a single H+2 molecular ion
Authors: David Holzapfel, Fabian Schmid, Nick Schwegler, Oliver Stadler, Martin Stadler, Alexander Ferk, Jonathan P. Home, Daniel Kienzler

Quantum entanglement in phase space
Authors: Shuheng Liu, Jiajie Guo, Qiongyi He, Matteo Fadel

Scalable and interpretable quantum natural language processing: an implementation on trapped ions
Authors: Tiffany Duneau, Saskia Bruhn, Gabriel Matos, Tuomas Laakkonen, Katerina Saiti, Anna Pearson, Konstantinos Meichanetzidis, Bob Coecke

Spontaneous symmetry breaking in a SO(3) non-Abelian lattice gauge theory in 2+1D with quantum algorithms
Authors: Sandip Maiti, Debasish Banerjee, Bipasha Chakraborty, Emilie Huffman

The role of higher-order terms in trapped-ion quantum computing with magnetic gradient induced coupling
Authors: Sebastian Nagies, Kevin T. Geier, Javed Akram, Junichi Okamoto, Dimitris Badounas, Christof Wunderlich, Michael Johanning, Philipp Hauke

Towards Scalable Quantum Networks
Authors: Connor Howe, Mohsin Aziz, Ali Anwar

Ultracold charged atom-dimer collisions: state-selective charge exchange and three-body recombination
Amrendra Pandey, Romain Vexiau, Luis Gustavo Marcassa, Olivier Dulieu,
Nadia Bouloufa-Maafa

Ultra-low Qβ value for the allowed decay of 110Agm confirmed via mass measurements
Authors: J. Ruotsalainen, M. Stryjczyk, M. Ramalho, T. Eronen, Z. Ge, A. Kankainen, M. Mougeot, J. Suhonen

Universal Quantum Gate Set for Gottesman-Kitaev-Preskill Logical Qubits
Authors: V. G. Matsos, C. H. Valahu, M. J. Millican, T. Navickas, X. C. Kolesnikow, M. J. Biercuk, T. R. Tan

Vibrationally coupled Rydberg atom-ion molecules
Authors: Ilango Maran, Liam J. Bond, Jeremy T. Young, Arghavan Safavi-Naini, Rene Gerritsma

Weaver: A Retargetable Compiler Framework for FPQA Quantum Architectures
Authors: Oğuzcan Kırmemiş, Francisco Romão, Emmanouil Giortamis, Pramod Bhatotia