382 citations · 1.4k across the 19 of their papers we have counts for
19 papers
Entangling ions with engineered light gradients
Tommaso Faorlin, Lorenz Panzl, Phoebe Grosser +12
Spectral crowding of collective motional modes limits the fidelity of entangling interactions in trapped-ion quantum processors by inducing off-resonant coupling to spectator modes…
Verifiable measurement-based quantum random sampling with trapped ions
Martin Ringbauer, Marcel Hinsche, Thomas Feldker +13
Quantum computers are now on the brink of outperforming their classical counterparts. One way to demonstrate the advantage of quantum computation is through quantum random sampling…
Demonstration of fault-tolerant universal quantum gate operations
Lukas Postler, Sascha Heußen, Ivan Pogorelov +10
Quantum computers can be protected from noise by encoding the logical quantum information redundantly into multiple qubits using error correcting codes. When manipulating the logic…
Optimal metrology with programmable quantum sensors
Christian D. Marciniak, Thomas Feldker, Ivan Pogorelov +7
Quantum sensors are an established technology that has created new opportunities for precision sensing across the breadth of science. Using entanglement for quantum-enhancement wil…
A compact ion-trap quantum computing demonstrator
Ivan Pogorelov, Thomas Feldker, Christian D. Marciniak +13
Quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry. Transitioning from lab-based, proof-o…
Experimental setup for studying an ultracold mixture of trapped Yb-Li
H. Hirzler, T. Feldker, H. Fürst +7
We describe and characterize an experimental apparatus that has been used to study interactions between ultracold lithium atoms and ytterbium ions. The preparation of ultracold clo…
Buffer gas cooling of a trapped ion to the quantum regime
T. Feldker, H. Fürst, H. Hirzler +5
Great advances in precision quantum measurement have been achieved with trapped ions and atomic gases at the lowest possible temperatures. These successes have inspired ideas to me…
Observation of Interactions between Trapped Ions and Ultracold Rydberg Atoms
N. V. Ewald, T. Feldker, H. Hirzler +2
We report on the observation of interactions between ultracold Rydberg atoms and ions in a Paul trap. The rate of observed inelastic collisions, which manifest themselves as charge…
Prospects of reaching the quantum regime in Li-Yb mixtures
H. A. Fürst, N. V. Ewald, T. Secker +3
We perform numerical simulations of trapped Yb ions that are buffer gas cooled by a cold cloud of Li atoms. This species combination has been suggested to be the mo…
Dynamics of a single ion spin impurity in a spin-polarized atomic bath
Henning Fürst, Thomas Feldker, Norman Vincenz Ewald +3
We report on observations of spin dynamics in single Yb ions immersed in a cold cloud of spin-polarized Li atoms. This species combination has been proposed to be the most…
Spectroscopy of the transition in Yb II: Isotope shifts, hyperfine splitting and branching ratios
Thomas Feldker, Henning Fürst, Norman Ewald +2
We report on spectroscopic results on the transition in single trapped Yb ions. We measure the isotope shifts for all stable Yb isotopes…
Observation of collisions between cold Li atoms and Yb ions
J. Joger, H. Fürst, N. Ewald +3
We report on the observation of cold collisions between Li atoms and Yb ions. This combination of species has recently been proposed as the most suitable for reaching the q…
Trapped ions in Rydberg-dressed atomic gases
T. Secker, N. Ewald, J. Joger +3
We theoretically study trapped ions that are immersed in an ultracold gas of Rydberg-dressed atoms. By off-resonant coupling on a dipole-forbidden transition, the adiabatic atom-io…
Towards Rydberg quantum logic with trapped ions
P. Bachor, T. Feldker, J. Walz +1
We demonstrate the excitation of ions to the Rydberg state by vacuum ultraviolet radiation at a wavelength of combined with the coherent manipulation of the…
Rydberg excitation of a single trapped ion
T. Feldker, P. Bachor, M. Stappel +4
We demonstrate excitation of a single trapped cold Ca ion to Rydberg levels by laser radiation in the vacuum-ultraviolet at 122 nm wavelength. Observed resonances are id…
Mode shaping in mixed ion crystals of 40Ca2+ and 40Ca+
T. Feldker, L. Pelzer, M. Stappel +5
We present studies of mixed Coulomb crystals of 40Ca+ and 40Ca2+ ions in a linear Paul trap. Doubly charged ions are produced by photoionisation of trapped 40Ca+ with a vacuum ultr…
Heteronuclear collisions between laser-cooled metastable neon atoms
Jan Schütz, Thomas Feldker, Holger John +1
We investigate heteronuclear collisions in isotope mixtures of laser-cooled metastable 3P2 neon. Experiments are performed with spin-polarized atoms in a magnetic trap for all two-…
Magneto-optical trapping of bosonic and fermionic neon isotopes and their mixtures: isotope shift of the ^3P_2 to ^3D_3 transition and hyperfine constants of the ^3D_3 state of Ne-21
Thomas Feldker, Jan Schuetz, Holger John +1
We have magneto-optically trapped all three stable neon isotopes, including the rare Ne-21, and all two-isotope combinations. The atoms are prepared in the metastable ^3P_2 state a…
Rydberg excitation of trapped cold ions: A detailed case study
F. Schmidt-Kaler, T. Feldker, D. Kolbe +5
We provide a detailed theoretical and conceptual study of a planned experiment to excite Rydberg states of ions trapped in a Paul trap. The ultimate goal is to exploit the strong s…