Day 1 Dec-2 2021
Session 2 16:30-17:15

Quantum computing with trapped ions

F. Schmidt-Kaler*, J. Hilder, D. Pijn, D. Wessel, C. Melzer, A. Müller, J. Wagner, O. Onishchenko, A. Stahl, M. Orth, F. Stopp, B. Lekitsch, U. Poschinger
QUANTUM, University of Mainz, Germany

Quantum technologies open up new computation applications, new simulation and sensing techniques. Here we focus on a quantum computer based on trapped ion qubits. We use segmented micro traps and dynamically shuttle ions, reorder this way qubit registers according to the required quantum algorithm. This allows for a high qubit connectivity in combination scalable high quantum gate fidelities. Currently we achieve 99.995% fidelity for single and 99.75% for two-qubit gates. On the way towards quantum error correction we have implemented fault-tolerant parity readout [1]. Fabrication methods, electronics control infrastructure and optical qubit control [2] is pushed for a 50 up to 100 qubit device, and we are investigating further scalability by trap-to-trap ion transports [3]. We have built the full computational stack, including a user interface (see and have low latency interface to a classical high performance computer nearby. In this combination of HPC and QC, we are working towards a simulation of complex chemical structures and reactions.

[1] J.Hilder, et al, Fault-tolerant parity readout on a shuttling-based trapped-ion quantum computer, arXiv:2102.12047
[2] V. Kaushal, et al, Shuttling-Based Trapped-Ion Quantum Information Processing, AVS Quantum Sci. 2, 014101 (2020)
[3] F. Stopp, H. Lehec, F. Schmidt-Kaler, A Deterministic Single Ion Fountain, arXiv:2108.06948

Studies of physics at Univ. Bochum, Bonn, and München. Diploma with H. Walther and G. Rempe (1989), PhD with T. Hänsch at Max Planck Inst. for Quantum Optics, München (1992), Postdoc with S. Haroche at Ecole Normale Sup., Paris (until 1995), Assistant with R. Blatt and Assistant Professor at Univ. Innsbruck, Austria (until 2005), full Professor and head of Inst. for Quantum Information Processing at Univ. Ulm (until 2010), and since then full Professor and head of unit QUANTUM at Univ. Mainz. Main research fields include laser cooling and trapping of atoms and ions, high resolution spectroscopy, quantum information technologies with atoms, ions, electrons and solids. More than 200 publications with >18k citations, see