ITN Newsletter – February 2021

ITN Newsletter – February 2021

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Virtual Les Houches was a great School. Over 60 extremely motivated young ion trappers have followed two weeks of lectures, tutorials, working groups, poster session with a lot of enthusiasm and many interesting questions. They have transformed the event into a really special school with poster discussion til late after midnight, and real-time visits of the experiments. Thanks to all for their contributions, participants and lecturers, and an additional mention to the "technical" helpers who have supported the logistics !


Dear all,

Virtual Les Houches was a great School. Over 60 extremely motivated young ion trappers have followed two weeks of lectures, tutorials, working groups, poster session with a lot of enthusiasm and many interesting questions. They have transformed the event into a really special school with poster discussion til late after midnight, and real-time visits of the experiments. Thanks to all for their contributions, participants and lecturers, and an additional mention to the “technical” helpers who have supported the logistics !


AQT launches the Pine ion trap

EPJ QT special issue: “Quantum Metrology & Quantum Enhanced Measurement“. Submissions are accepted from now until 30 June 2021. Details

Online seminars

On Tuesday 9 March 2021 from 9-12h, Max Planck, RIKEN, PTB Center for Time, Constants, and Fundamental Symmetries is organizing a workshop on recent advances in trap and clock spectroscopy, details can be found HERE
Virtual Seminar on Precision Physics and Fundamental Symmetries 2020
an initiative for the precision physics and quantum information community every Thursday   LINK

The Virtual AMO Seminar ( Fridays, 7pm (UTC) 
The “Quantum Science Seminar” ( Thursdays, 5pm


European Conference on Trapped Ions (ECTI), Djurönäset, Sweden, summer 2021

52nd EGAS conference, in Zagreb, Croatia, 5-9 July 2021

27th International Conference on Atomic Physics (ICAP) in Toronto, Canada, 17-22 July 2022 LINK

25th ICOLS, Estes Park, Colorado/USA, June 2023


PhD, postdoc and a research assistant position at the University of Amsterdam (UvA), the Free University of Amsterdam (VU) and the Eindhoven University of Technology (TU/e). Details and contacts can be found HERE or at

PhD studentship: Developing and Operating a Trapped Ion Quantum computer Prototype at University of Sussex (

PhD studentship: Developing Silicon Microchips for Ion Trap Quantum Computers at University of Sussex (

PhD positions for the new IQuAn project on trapped-ion quantum computing in combination with a super computer at the University of Mainz, see, and please contact Ferdinand Schmidt-Kaler ().

Two PhD positions for new projects in the SFB on collective properties of light scattering and heat transport in ion crystals, please contact Ferdinand Schmidt-Kaler ().

Postdoctoral Research Associate and PhD positions are available on quantum simulation and sensing with large beryllium ion crystals at the University of Sydney (LINK). For details please contact Robert Wolf ().

The UC Berkeley ion trap group has postdoctoral positions available to work on quantum information with trapped ions or electrons as well as on rotating ion crystals. For more information, please visit our homepage  and/or contact Hartmut Haeffner via

Postdoc position available at Stockholm University on Experimental Quantum Computation with Trapped Rydberg Ions. For more information see or contact

Oxford Ionics is a UK-based start-up building trapped-ion quantum computers. We are hiring ion trappers for a range of positions. If this could be a fit for you, we’d love to hear from you at

2 PhD studentships at Sussex University are available. Details can be found HERE and HERE

The Trapped Ion Quantum Information group at ETH Zürich, Switzerland, seeks a postdoc for the ERC funded IONPEN project. This experiment aims to realize a novel platform for quantum computation and simulation using trapped ions in 2-dimensional arrays of Penning microtraps. For further details please see the job advert  or contact the group ()

A PhD position in theoretical quantum many-body physics at the University of Tübingen. For details, please contact Igor Lesanowsky.

Postdoc and PhD positions are available at LaserLaB of the Vrije Universiteit Amsterdam (The Netherlands) at several projects that focus on fundamental physics through laser precision measurements of He+, HD+, H2+, HD and HT. For more information see: LINK

Postdoctoral and PhD positions at RWTH Aachen and Forschungszentrum Jülich in the theoretical quantum technology group in the area of quantum information processing, with a focus on quantum error correction, fault-tolerant quantum computing and physical implementations. Please contact

Permanent positions (at postdoc level) are available to develop optical and microwave atomic clocks at the UK’s National Physical Laboratory. Contact: Details. 
2 Research Fellow Positions
in Quantum Technology for Fundamental Physics at in the ITCM-Group at the University of Sussex. The research project is part of the UK ‘Network of clocks for measuring the stability of fundamental constants’ consortium. The consortium aims to build a network of dissimilar clocks to search for spatio-temporal changes in fundamental constants. The team at Sussex investigate transitions in molecular nitrogen ions to measure changes in the proton-to-electron mass ratio. Our partners in the network are the National Physical Laboratory, Imperial College London, the University of Birmingham and the University of Sussex. More information here or contact Matthias Keller ().


You can also find postdoc positions in frequency metrology, cold atoms and quantum information


Please sent informations about your publications to

A micro-optical module for multi-wavelength addressing of trapped ions
Matthew L Day, Kaushal Choonee, Zachary Chaboyer, Simon Gross, Michael J Withford, Alastair G Sinclair and Graham D Marshall
Quantum Sci. Technol. 6 024007 (2021)

Blockade of phonon hopping in trapped ions in the presence of multiple local phonons
Ryutaro Ohira, Shota Kume, Kyoichi Takayama, Silpa Muralidharan, Hiroki Takahashi, and Kenji Toyoda
Phys. Rev. A 103, 012612 (2021)

Character of motional modes for entanglement and sympathetic cooling of mixed-species trapped-ion chains
K. Sosnova, A. Carter, and C. Monroe
Phys. Rev. A 103, 012610 (2021)

Circumventing Detector Backaction on a Quantum Cyclotron
X. Fan and G. Gabrielse,
Phys. Rev. Lett. 126, 070402 (2021)

Combined atomic clock with blackbody-radiation-shift-induced instability below 10−19 under natural environment conditions
V I Yudin, A V Taichenachev, M Yu Basalaev, O N Prudnikov, H A Fürst, T E Mehlstäubler and S N Bagayev
New J. Phys. 23 023032 (2021)

Cross-Beam Energy Transfer Saturation by Ion Heating
A.  M. Hansen, K. L. Nguyen, D. Turnbull, B. J. Albright, R. K. Follett, R. Huff, J. Katz, D. Mastrosimone, A. L. Milder, L. Yin, J. P. Palastro, and D. H. Froula
Phys. Rev. Lett. 126, 075002 (2021)

Direct observation of ion micromotion in a linear Paul trap
Liudmila A. Zhukas, Maverick J. Millican, Peter Svihra, Andrei Nomerotski, and Boris B. Blinov
Phys. Rev. A 103, 023105 (2021)

Driven one-particle quantum cyclotron
X. Fan and G. Gabrielse
Phys. Rev. A 103, 022824 (2021)

Experimental Determination of PT-Symmetric Exceptional Points in a Single Trapped Ion
Liangyu Ding, Kaiye Shi, Qiuxin Zhang, Danna Shen, Xiang Zhang, and Wei Zhang
Phys. Rev. Lett. 126, 083604 (2021)

Fast cooling of trapped ion in strong sideband coupling regime
Shuo Zhang, Jian-Qi Zhang, Wei Wu, Wan-Su Bao and Chu Guo
New J. Phys. 23 023018 (2021)

First Penning trap mass measurement of 36Ca
J. Surbrook, G. Bollen, M. Brodeur, A. Hamaker, D. Pérez-Loureiro, D. Puentes, C. Nicoloff, M. Redshaw, R. Ringle, S. Schwarz, C. S. Sumithrarachchi, L. J. Sun, A. A. Valverde, A. C. C. Villari, C. Wrede, and I. T. Yandow
Phys. Rev. C 103, 014323 (2021)

High-fidelity entangling gates in a three-dimensional ion crystal under micromotion
Y.-K. Wu, Z.-D. Liu, W.-D. Zhao, and L.-M. Duan
Phys. Rev. A 103, 022419 (2021)

Life and death of a cold BaRb+ molecule inside an ultracold cloud of Rb atoms
Amir Mohammadi, Artjom Krükow, Amir Mahdian, Markus Deiß, Jesús Pérez-Ríos, Humberto da Silva, Jr., Maurice Raoult, Olivier Dulieu, and Johannes Hecker Denschlag
Phys. Rev. Research 3, 013196 (2021)

New Electron Trap Might Help Quantum Computers
Philip Ball,Physics 14, 16 (2021)

Observation of a quantum phase transition in the quantum Rabi model with a single trapped ion
M.-L. Cai, Z.-D. Liu, W.-D. Zhao, Y.-K. Wu, Q.-X. Mei, Y. Jiang, L. He, X. Zhang, Z.-C. Zhou & L.-M. Duan
Nature Communications 12 , 1–8 (2021)

Observation of line emissions from Ni-like W46 + ions in wavelength range of 7–8 Å in the Large Helical Device
Tetsutarou Oishi, Shigeru Morita, Daiji Kato, Izumi Murakami, Hiroyuki A Sakaue, Yasuko Kawamoto and Motoshi Goto
Phys. Scr. 96 025602 (2021)

Optical frequency ratio of a 171Yb+ single-ion clock and a 87Sr lattice clock
S Dörscher, N Huntemann, R Schwarz, R Lange, E Benkler, B Lipphardt, U Sterr, E Peik and C Lisdat
Metrologia 58 015005 (2021)

Probing multiple electric-dipole-forbidden optical transitions in highly charged nickel ions
Shi-Yong Liang, Ting-Xian Zhang, Hua Guan, Qi-Feng Lu, Jun Xiao, Shao-Long Chen, Yao Huang, Yong-Hui Zhang, Cheng-Bin Li, Ya-Ming Zou, Ji-Guang Li, Zong-Chao Yan, Andrei Derevianko, Ming-Sheng Zhan, Ting-Yun Shi, and Ke-Lin Gao
Phys. Rev. A 103, 022804 (2021)

Proton–electron mass ratio by high-resolution optical spectroscopy of ion ensembles in the resolved-carrier regime
I. V. Kortunov, S. Alighanbari, M. G. Hansen, G. S. Giri, V. I. Korobov & S. Schiller – Show fewer authors
Nature Physics , 1–5 (2021)

Pulsed Ion Microscope to Probe Quantum Gases
C. Veit, N. Zuber, O. A. Herrera-Sancho, V. S. V. Anasuri, T. Schmid, F. Meinert, R. Löw, and T. Pfau
Phys. Rev. X 11, 011036 (2021)

Quantum Computer Systems for Scientific Discovery
Yuri Alexeev, Dave Bacon, Kenneth R. Brown, Robert Calderbank, Lincoln D. Carr, Frederic T. Chong, Brian DeMarco, Dirk Englund, Edward Farhi, Bill Fefferman, Alexey V. Gorshkov, Andrew Houck, Jungsang Kim, Shelby Kimmel, Michael Lange, Seth Lloyd, Mikhail D. Lukin, Dmitri Maslov, Peter Maunz, Christopher Monroe, John Preskill, Martin Roetteler, Martin J. Savage, and Jeff Thompson
PRX Quantum 2, 017001 (2021)

Quantum reactive scattering in the long-range ion-dipole potential
Tomasz Wasak and Zbigniew Idziaszek
Phys. Rev. A 103, 023324 (2021)

Quantum Simulators: Architectures and Opportunities
Ehud Altman et al.
PRX Quantum 2, 017003 (2021)

Switchable Damping for a One-Particle Oscillator
X. Fan, S. E. Fayer, T. G. Myers, B. A. D. Sukra, G. Nahal, and G. Gabrielse,
Rev. Sci. Instrum. 92, 023201 (2021)

The thorium-229 low-energy isomer and the nuclear clock
Kjeld Beeks, Tomas Sikorsky, Thorsten Schumm, Johannes Thielking, Maxim V. Okhapkin & Ekkehard Peik
Nature Reviews Physics , 1–11 (2021)

Towards chemistry at absolute zero
Brianna R. Heazlewood, and Timothy P. Softley
Nature Reviews Chemistry volume 5, 125–140 (2021)

Tunable transverse spin–motion coupling for quantum information processing
Adam D West, Randall Putnam, Wesley C Campbell and Paul Hamilton
Quantum Sci. Technol. 6 024003 (2021)

Ultraviolet Laser Pulses with Multigigahertz Repetition Rate and Multiwatt Average Power for Fast Trapped-Ion Entanglement Operations
M.I. Hussain, D. Heinrich, M. Guevara-Bertsch, E. Torrontegui, J.J. García-Ripoll, C.F. Roos, and R. Blatt
Phys. Rev. Applied 15, 024054 (2021)

Visible spectra of W8+ in an electron-beam ion trap
Q. Lu (陆祺峰), C. L. Yan (严成龙), J. Meng (孟举), G. Q. Xu (许帼芹), Y. Yang (杨洋), C. Y. Chen (陈重阳), J. Xiao (肖君), J. G. Li (李冀光), J. G. Wang (王建国), and Y. Zou (邹亚明)
Phys. Rev. A 103, 022808 (2021)

Wavelength-insensitive, multispecies entangling gate for group-2 atomic ions
Brian C. Sawyer and Kenton R. Brown
Phys. Rev. A 103, 022427 (2021)


Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic
Steven A. King, Lukas J. Spieß, Peter Micke, Alexander Wilzewski, Tobias Leopold, José R. Crespo López-Urrutia, Piet O. Schmidt

Characterizing the dynamical phase diagram of the Dicke model via classical and quantum probes
R. J. Lewis-Swan, S. R. Muleady, D. Barberena, J. J. Bollinger, A. M. Rey

Charge exchange radiation diagnostic with gas jet target for measurement of plasma flow velocity in the linear magnetic trap
A. Lizunov

Comparison of Cloud-Based Ion Trap and Superconducting Quantum Computer Architectures
S. Blinov, B. Wu, C. Monroe

Demonstration of quantum advantage by a joint detection receiver for optical communications using quantum belief propagation on a trapped-ion device
Conor Delaney, Kaushik P. Seshadreesan, Ian MacCormack, Alexey Galda, Saikat Guha, Prineha Narang

Design of Light-Matter Interactions for Quantum Technologies
I. Arrazola

Dynamic compensation of stray electric fields in an ion trap using machine learning and adaptive algorithm
Moji Ghadimi, Alexander Zappacosta, Jordan Scarabel, Kenji Shimizu, Erik W Streed, Mirko Lobino

Efficient and Accurate Electronic Structure Simulation Demonstrated on a Trapped-Ion Quantum Computer
Yukio Kawashima, Marc P. Coons, Yunseong Nam, Erika Lloyd, Shunji Matsuura, Alejandro J. Garza, Sonika Johri, Lee Huntington, Valentin Senicourt, Andrii O. Maksymov, Jason H. V. Nguyen, Jungsang Kim, Nima Alidoust, Arman Zaribafiyan, Takeshi Yamazaki

Ground-state and decay properties of neutron-rich 106Nb
A. J. Mitchell, R. Orford, G. J. Lane, C. J. Lister, P. Copp, J. A. Clark, G. Savard, J. M. Allmond, A. D. Ayangeakaa, S. Bottoni, M. P. Carpenter, P. Chowdhury, D. A. Gorelov, R. V. F. Janssens, F. G. Kondev, U. Patel, D. Seweryniak, M. L. Smith, Y. Y. Zhong, S. Zhu

High-fidelity laser-free universal control of two trapped ion qubits
R. Srinivas, S. C. Burd, H. M. Knaack, R. T. Sutherland, A. Kwiatkowski, S. Glancy, E. Knill, D. J. Wineland, D. Leibfried, A. C. Wilson, D. T. C. Allcock, D. H. Slichter

Infrared action spectroscopy of doubly charged PAHs and their contribution to the aromatic infrared bands
Shreyak Banhatti, Julianna Palotás, Pavol Jusko, Britta Redlich, Jos Oomens, Stephan Schlemmer, Sandra Brünken

Many-body quantum teleportation via operator spreading in the traversable wormhole protocol
Thomas Schuster, Bryce Kobrin, Ping Gao, Iris Cong, Emil T. Khabiboulline, Norbert M. Linke, Mikhail D. Lukin, Christopher Monroe, Beni Yoshida, Norman Y. Yao

Measurement of electric-field noise from interchangeable samples with a trapped-ion sensor
Kyle S. McKay, Dustin A. Hite, Philip D. Kent, Shlomi Kotler, Dietrich Leibfried, Daniel H. Slichter, Andrew C. Wilson, David P. Pappas

Measurement of ion displacement via RF power variation for excess micromotion compensation
Ryoichi Saito, Kota Saito, Takashi Mukaiyama

Motional resonances of three-dimensional dual-species Coulomb crystals
Byoung-moo Ann, Fabian Schmid, Jonas Krause, Theodor W. Hänsch, Thomas Udem, Akira Ozawa

Non-destructive detection of large molecules without mass limitation
Adrien Poindron, Jofre Pedregosa-Gutierrez, Christophe Jouvet, Martina Knoop, Caroline Champenois

Observation of a prethermal discrete time crystal
Antonis Kyprianidis, Francisco Machado, William Morong, Patrick Becker, Kate S. Collins, Dominic V. Else, Lei Feng, Paul W. Hess, Chetan Nayak, Guido Pagano, Norman Y. Yao, Christopher Monroe

Observation of a quantum phase transition in the quantum Rabi model with a single trapped ion
M. -L. Cai, Z. -D. Liu, W. -D. Zhao, Y. -K. Wu, Q. -X. Mei, Y. Jiang, L. He, X. Zhang, Z. -C. Zhou, L. -M. Duan

Observation of Stark many-body localization without disorder
W. Morong, F. Liu, P. Becker, K. S. Collins, L. Feng, A. Kyprianidis, G. Pagano, T. You, A. V. Gorshkov, C. Monroe

Quantum computing hardware in the cloud: Should a computational chemist care?
A. Rossi, P. G. Baity, V. M. Schäfer, M. Weides

Quantum Variational Optimization of Ramsey Interferometry and Atomic Clocks
Raphael Kaubruegger, Denis V. Vasilyev, Marius Schulte, Klemens Hammerer, Peter Zoller

Qubit-efficient exponential suppression of errors
Piotr Czarnik, Andrew Arrasmith, Lukasz Cincio, Patrick J. Coles

Riemann zeros from a periodically-driven trapped ion
Ran He, Ming-Zhong Ai, Jin-Ming Cui, Yun-Feng Huang, Yong-Jian Han, Chuan-Feng Li, Guang-Can Guo, G. Sierra, C. E. Creffield

Single Ion Thermal Wave Packet Analyzed Via Time-Of-Flight Detection
Felix Stopp, Luis Ortiz-Gutiérrez, Henri Lehec, Ferdinand Schmidt-Kaler

Superposition of two-mode squeezed states for quantum information processing and quantum sensing
Fernando R. Cardoso, Daniel Z. Rossatto, Gabriel P. L. M. Fernandes, Gerard Higgins, Celso J. Villas-Boas

The rigorous criteria for the phase transitions in Coulomb crystals
 A. V. Romanova, S. S. Rudyi, Y. V. Rozhdestvensky

An ultralow-noise superconducting radio-frequency ion trap for frequency metrology with highly charged ions
J. Stark, C. Warnecke, S. Bogen, S. Chen, E. A. Dijck, S. Kühn, M. K. Rosner, A. Graf, J. Nauta, J. -H. Oelmann, L. Schmöger, M. Schwarz, D. Liebert, L. J. Spieß, S. A. King, T. Leopold, P. Micke, P. O. Schmidt, T. Pfeifer, J. R. Crespo López-Urrutia

Copyright 2020 ITN | Published on behalf of the COST Action Trapped Ions: Progress in classical and quantum applications
Editorial team: Alejandro Bermudez, Martina Knoop

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