Newsletter – November 2019

Newsletter – November 2019

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You are more than 1000 ion trappers to receive this newsletter every month, and we see an enthusiastic evolution of subscribers. In order to make this happen, Alejandro Bermudez and I work on this and we need every year a small budget to keep going.

Dear all,

you are more than 1000 ion trappers to receive this newsletter every month, and we see an enthusiastic evolution of subscribers. In order to make this happen, Alejandro Bermudez and I work on this and we need every year a small budget to keep going. There have been a number of generous donors to support us financially, and we wish to thank – in your name – very warmly the following people and their groups:

Klaus Blaum, Heidelberg; Rainer Blatt, Innsbruck; Ferdinand Schmidt-Kaler, Mainz; Piet O. Schmidt, Braunschweig; and Stephan Schiller, Düsseldorf;  as well as Jonathan Home and Mirjam Bruttin from Zürich who provide an important logistics support.

If you would like to also support this newsletter (and the community), please do not hesitate to contact me. Everyone is welcome to do so 😉

Best regards,

Martina Knoop


Finally we can announce the winner of the logo contest!  We thank all the participants for their original and funny proposals. Eventually the victory went to … Chiara Decaroli from ETH Zuerich, her logo perfectly blends art and design with ion trapping!  You will soon discover it on our new Action website !! Congratulations!!

Regarding our colleagues from the UK, COST informs us that: Brexit Update: UK government has extended the Underwrite Guarantee of Horizon 2020 to COST.  The UK government has committed to provide funding for eligible UK participation in COST Actions until the end of 2020 in case of a no-deal Brexit.

Special Issue in Applied Sciences (Open Access Journal): “Optical Trapping of Ions and Atoms 2020: Novel Advances and Prospects“, now open for submissions.
Guest Editors:  Tobias Schätz, Vladan Vuletic, Michael Drewsen, Jonathan Home, Leon Karpa        Details

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


IQuMS 2019 -the “International conference on quantum Metrology and Sensing”  will be held in Paris, France from 9 to 13 December 2019. LINK

Early Career Conference on Trapped Ions, to be held at CERN, Geneva 13-17 January 2020. LINK

DPG Spring Meeting “Atomic Physics” 9 – 13 March 2020 in Hannover LINK

European Conference on Trapped Ions (ECTI), Djurönäset, Sweden, 13-17 July 2020

CCMI 2020 – Cold and Controlled Molecules and Ions, 6 – 11 September 2020, Durham University, UK, LINK


A PhD position is available in the group of Prof. Stefan Willitsch (University of Basel, Switzerland) on cold ion-molecule hybrid systems. See the group’s website for further information.

Two PhD positions are available on fundamental tests based on precision (frequency comb) spectroscopy of trapped He+ ions, molecular hydrogen and quantum-degenerate meta-stable helium at the Vrije Universiteit Amsterdam, The Netherlands. More information at:

A new PhD position is open at the Physics department of University of Mainz on “Scalable Quantum Computing with Trapped Ions”. More information is available HERE. The successful candidate will work on a cutting-edge experiment aiming at the realization of elementary quantum algorithms based on shuttling trapped-ion qubits in segmented microchip traps. If you are interested, please contact Ulrich Poschinger () and Ferdinand Schmidt-Kaler ().

LaserLaB VU Amsterdam, the Netherlands, has an open PhD position on Doppler-free laser spectroscopy of trapped molecular hydrogen ions. LINK

A new PhD position is open at the Physics department of University of Mainz on “Rydberg Ions for Quantum Computation and Quantum Sensing”. More information is available HERE. The successful candidate will work on the experiment that combines exciting aspects of Rydberg physics with trapped-ion qubits. If you are interested, please contact Ferdinand Schmidt-Kaler ().

We are currently seeking to recruit two motivated and enthusiastic postdoctoral research associates to join the ALPHA collaboration at CERN/Switzerland. LINK

PhD position (3 years), fully funded by  the German Science Foundation (DFG), is available in the

laser molecular spectroscopy group of Otto Dopfer at Technische Universität Berlin, Germany. Details

The Department of Physics at Yale University is inviting applications for a faculty appointment in the area of experimental quantum science. The position is open at all levels. DETAILS

Postdoc and PhD positions on projects in Quantum Computing and Error Correction as well as Quantum Neural Networks with Trapped Ions are available in the Theoretical Quantum Technology Group of Markus Müller at RWTH Aachen and Forschungszentrum Jülich. Please contact Markus Müller for details.

A PhD position in theoretical many-body physics with Rydberg atoms at University Tübingen with Igor Lesanowsky. Please contact directly at

We are looking for a PhD student from a European country for an ITN network. The person will work on one of the coolest QT-Flagship projects ever, building a laser system for a transportable optical Sr-clock. Details. In 10 years optical clocks will be all over the place.

A PhD position in theoretical quantum physics in Quantum dynamics of impurities with long-range impurity-bath interactions. Details

PhD Position, Scientist and Developer at Swabian Instruments. Details

A postdoc position on Ultra-stable frequency laser development for ground tests of the payload of LISA mission at SYRTE, Paris,France. Please contact

Two postdoc positions are available at the Stefan Meyer Institute for Subatomic Physics of the Austrian Academy of Sciences in Vienna on physics with trapped charged particles for antihydrogen production (ASACUSA collaboration). LINK1 and LINK2

A postdoc position at Laboratoire de Physique des Lasers (Villetaneuse, close to Paris) on Ultrastable frequency transfer through optical fiber links in a Euramet project. Details

One open PhD position would be for Quantum Simulation with large beryllium ion crystals in a Penning trap. Interested students should please contact Robert Wolf () and Michael Biercuk ().

Furthermore, we have two open PhD positions at our Paul trap experiments with ytterbium ions on Quantum Control and Quantum Simulation, please contact Cornelius Hempel () and Michael Biercuk ().

Ultracold Quantum Molecular Systems Group at the Faculty of Physics of the University of Warsaw in Poland - – is looking for two postdoctoral researchers in the field of theoretical AMO physics / quantum chemistry. Please contact Michał Tomza (

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


Please sent informations about your publications to

Benchmarking an 11-qubit quantum computer
K. Wright, K. M. Beck, S. Debnath, J. M. Amini, Y. Nam, N. Grzesiak, J.-S. Chen, N. C. Pisenti, M. Chmielewski, C. Collins, K. M. Hudek, J. Mizrahi, J. D. Wong-Campos, S. Allen, J. Apisdorf, P. Solomon, M. Williams, A. M. Ducore, A. Blinov, S. M. Kreikemeier, V. Chaplin, M. Keesan, C. Monroe & J. Kim
Nature Communications volume 10, Article number: 5464 (2019)

Coherent coupling between the motional fluctuation of a mirror and a trapped ion inside an optical cavity: Memory, state transfer, and entanglement
Devender Garg and Asoka Biswas
Phys. Rev. A 100, 053822 (2019)

Combined experimental and theoretical probe of the branching fractions of the 4P3/2 state in 40Ca+
Hong-Fang Song, Yong-Bo Tang, Shao-Long Chen, Li-Jun Du, Yao Huang, Hua Guan, and Ke-Lin Gao
Phys. Rev. A 100, 052505 (2019)

Direct determination of the energy of the first excited fine-structure level in Ba6+
N. Kimura, R. Kodama, K. Suzuki, S. Oishi, M. Wada, K. Okada, N. Ohmae, H. Katori, and N. Nakamura
Phys. Rev. A 100, 052508 (2019)

Direct limits on the interaction of antiprotons with axion-like dark matter
C. Smorra, Y. V. Stadnik, P. E. Blessing, M. Bohman, M. J. Borchert, J. A. Devlin, S. Erlewein, J. A. Harrington, T. Higuchi, A. Mooser, G. Schneider, M. Wiesinger, E. Wursten, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, Y. Yamazaki, D. Budker & S. Ulmer
Nature volume 575, pages 310–314 (2019)

Dynamical phase diagram of a quantum Ising chain with long-range interactions
Giulia Piccitto, Bojan Žunkovič, and Alessandro Silva
Phys. Rev. B 100, 180402(R) (2019) 

Dual-species, multi-qubit logic primitives for Ca+/Sr+ trapped-ion crystals
C. D. Bruzewicz, R. McConnell, J. Stuart, J. M. Sage & J. Chiaverini
npj Quantum Information volume 5, Article number: 102 (2019)

Efficient isotope-selective pulsed laser ablation loading of 174Yb+ ions in a surface electrode trap
Vrijsen, Geert; Aikyo, Yuhi; Spivey, Robert F.; Inlek, I. Volkan; Kim, Jungsang
Optics Express 27(23) 33907-33914, 2019

Erratum: Quantum simulation of long-range
XY quantum spin glass with strong area-law violation using trapped ions [Phys. Rev. A 99, 052342 (2019)]
Nilanjan Roy, Auditya Sharma, and Rick Mukherjee
Phys. Rev. A 100, 059902 (2019)

Fast state and trap rotation of a particle in an anisotropic potential
I Lizuain, A Tobalina, A Rodriguez-Prieto and J G Muga
2019 J. Phys. A: Math. Theor. 52 465301

Floquet-Engineered Vibrational Dynamics in a Two-Dimensional Array of Trapped Ions
Philip Kiefer, Frederick Hakelberg, Matthias Wittemer, Alejandro Bermúdez, Diego Porras, Ulrich Warring, and Tobias Schaetz
Phys. Rev. Lett. 123, 213605 (2019)

Ion-induced interactions in a Tomonaga-Luttinger liquid
A. B. Michelsen, M. Valiente, N. T. Zinner, and A. Negretti
Phys. Rev. B 100, 205427 (2019)

Isotope-resolved photodissociation pathways of lead-doped bismuth clusters from tandem multi-reflection time-of-flight mass spectrometry
P. Fischer, L. Schweikhard
Phys. Rev. Research 1, 033050 (2019)

Locality and heating in periodically driven, power-law-interacting systems
Minh C. Tran, Adam Ehrenberg, Andrew Y. Guo, Paraj Titum, Dmitry A. Abanin, and Alexey V. Gorshkov
Phys. Rev. A 100, 052103 (2019)

Long-range versus short-range effects in cold molecular ion-neutral collisions
Alexander D. Dörfler, Pascal Eberle, Debasish Koner, Michał Tomza, Markus Meuwly & Stefan Willitsch
Nature Communications volume 10, Article number: 5429 (2019)

Multiple ion capture and separation in an electrostatic storage device
P. Fischer, G. Marx, L. Schweikhard
Int. J. Mass Spectrom. 435, 305-314 (2019)

Observation of electric octupole emission lines strongly enhanced by the anomalous behavior of a cascading contribution
Hiroyuki A. Sakaue, Daiji Kato, Izumi Murakami, Hayato Ohashi, and Nobuyuki Nakamura
Phys. Rev. A 100, 052515 (2019)

Phonon Pair Creation by Inflating Quantum Fluctuations in an Ion Trap
Matthias Wittemer, Frederick Hakelberg, Philip Kiefer, Jan-Philipp Schröder, Christian Fey, Ralf Schützhold, Ulrich Warring, and Tobias Schaetz
Phys. Rev. Lett. 123, 180502 (2019)

Photofragmentation of Bin+/- clusters (n=2-19) in an electrostatic ion beam trap
P. Fischer, L. Schweikhard
Eur. Phys. J. D 73, 105 (2019)

Precision Measurement of Atomic Isotope Shifts Using a Two-Isotope Entangled State
Tom Manovitz, Ravid Shaniv, Yotam Shapira, Roee Ozeri, and Nitzan Akerman
Phys. Rev. Lett. 123, 203001 (2019)

QED tests with highly charged ions
P Indelicato
2019 J. Phys. B: At. Mol. Opt. Phys. 52 232001

Quantum Time Crystals from Hamiltonians with Long-Range Interactions
Valerii K. Kozin and Oleksandr Kyriienko
Phys. Rev. Lett. 123, 210602 (2019)

Quantum Interference between Photons from an Atomic Ensemble and a Remote Atomic Ion
A. N. Craddock, J. Hannegan, D. P. Ornelas-Huerta, J. D. Siverns, A. J. Hachtel, E. A. Goldschmidt, J. V. Porto, Q. Quraishi, and S. L. Rolston
Phys. Rev. Lett. 123, 213601 (2019)

Trapping of C2 − in a digital ion trap
Alexander Hinterberger, Sebastian Gerber, Emanuel Oswald, Christan Zimmer, Julian Fesel and Michael Doser
2019 J. Phys. B: At. Mol. Opt. Phys. 52 225003  


Coherent control for qubit state readout
Conrad Roman, Anthony Ransford, Michael Ip, Wesley C. Campbell

Convenient real time monitor of the contamination of surface ion trap
Xinfang Zhang, Yizhu Hou, Ting Chen, Wei Wu, Pingxing Chen

Development of a recoil ion source providing slow Th ions including 229(m)Th in a broad charge state distribution
Raphael Haas, Tom Kieck, Dmitry Budker, Christoph E. Düllmann, Karin Groot-Berning, Wenbing Li, Dennis Renisch, Ferdinand Schmidt-Kaler, Felix Stopp, Anna Viatkina

Eigenstate extraction with neural-network tomography
Abhijeet Melkani, Clemens Gneiting, Franco Nori

Expansion Dynamics of Cold Non-Neutral Plasma
Michael A. Viray, Stephanie A. Miller, Georg Raithel

High-rate, high-fidelity entanglement of qubits across an elementary quantum network
L J Stephenson, D P Nadlinger, B C Nichol, S An, P Drmota, T G Ballance, K Thirumalai, J F Goodwin, D M Lucas, C J Ballance

Hybrid Microwave Radiation Patterns for High-Fidelity Quantum Gates with Trapped Ions
I. Arrazola, M. B. Plenio, E. Solano, J. Casanova

Improving the Indistinguishability of Single Photons from an Ion-Cavity System
Thomas Walker, Samir Vartabi Kashanian, Travers Ward, Matthias Keller

Laser-free trapped-ion entangling gates with simultaneous insensitivity to qubit and motional decoherence
R. T. Sutherland, R. Srinivas, S. C. Burd, H. M. Knaack, A. C. Wilson, D. J. Wineland, D. Leibfried, D. T. C. Allcock, D. H. Slichter, S. B. Libby

Light from an ion crystal: bunching or antibunching?
Sebastian Wolf, Stefan Richter, Joachim von Zanthier, Ferdinand Schmidt-Kaler

Nonlinear Bell inequality for macroscopic measurements
Adam Bene Watts, Nicole Yunger Halpern, Aram Harrow

Optimally band-limited controls for quantum multi-axis spectral estimation
Virginia Frey, Leigh M. Norris, Lorenza Viola, Michael J. Biercuk

Precision frequency-comb terahertz spectroscopy on pure quantum states of a single molecular ion
Chin-wen Chou, Alejandra L. Collopy, Christoph Kurz, Yiheng Lin, Michael E. Harding, Philipp N. Plessow, Tara Fortier, Scott Diddams, Dietrich Leibfried, David. R. Leibrandt

Production of highly charged ions of rare species by laser-induced desorption inside an electron beam ion trap
Christoph Schweiger, Charlotte König, José R. Crespo López-Urrutia, Menno Door, Holger Dorrer, Christoph E. Düllmann, Sergey Eliseev, Pavel Filianin, Wenjia Huang, Kathrin Kromer, Peter Micke, Marius Müller, Dennis Renisch, Alexander Rischka, Rima X. Schüssler, Klaus Blaum

Quantum Gravity in the Lab: Teleportation by Size and Traversable Wormholes
Adam R. Brown, Hrant Gharibyan, Stefan Leichenauer, Henry W. Lin, Sepehr Nezami, Grant Salton, Leonard Susskind, Brian Swingle, Michael Walter

Quantum Simulation of Non-perturbative Cavity QED with Trapped Ions
Tuomas Jaako, Juan José Garcia-Ripoll, Peter Rabl

Real-time dynamics of string breaking in quantum spin chains
Roberto Verdel, Fangli Liu, Seth Whitsitt, Alexey V. Gorshkov, Markus Heyl

Robust and resource-efficient microwave near-field entangling 9Be+ gate
G. Zarantonello, H. Hahn, J. Morgner, M. Schulte, A. Bautista-Salvador, R. F. Werner, K. Hammerer, C. Ospelkaus

Simulating Lattice Gauge Theories within Quantum Technologies
M. C. Bañuls, R. Blatt, J. Catani, A. Celi, J. I. Cirac, M. Dalmonte, L. Fallani, K. Jansen, M. Lewenstein, S. Montangero, C. A. Muschik, B. Reznik, E. Rico, L. Tagliacozzo, K. Van Acoleyen, F. Verstraete, U. -J. Wiese, M. Wingate, J. Zakrzewski, P. Zoller

Single-ion addressing via trap potential modulation in global optical fields
Christopher M. Seck, Adam M. Meier, J. True Merrill, Harley T. Hayden, Brian C. Sawyer, Curtis E. Volin, Kenton R. Brown

Single-Particle Decoherence Can Improve Spin-Squeezing Generated In Collective Dynamics
K. Tucker, D. Barberena, R. J. Lewis-Swan, J. K. Thompson, J. G. Restrepo, A. M. Rey

State dependent motional squeezing of a trapped ion: new method and applications
Martín Drechsler, María Belén Farías Nahuel Freitas, Christian Tomás Schmiegelow, Juan Pablo Paz

Subspace benchmarking high-fidelity entangling operations with trapped ions
C. H. Baldwin, B. J. Bjork, J. P. Gaebler, D. Hayes, D. Stack

Theory of robust multi-qubit non-adiabatic gates for trapped-ions
Yotam Shapira, Ravid Shaniv, Tom Manovitz, Nitzan Akerman, Lee Peleg, Lior Gazit, Roee Ozeri, Ady Stern

Towards generation of cat states in trapped ions set-ups via FAQUAD protocols and dynamical decoupling
Mikel Palmero, Miguel Ángel Simón, Dario Poletti

Copyright 2019 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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