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Prof. Dr.  Christian Ospelkaus

https://orcid.org/0000-0002-4170-2936
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Publications

  1. 2025
  2. Published

    Microfabrication of an 8-qubit processor chip for a trapped-ion quantum computer demonstrator

    Krishnakumar, N., Giebel, F., Iseke, E., Thronberens, K., Stupp, J., Stahr, N. D., Munoz, R., Kaune, B., Meiners, T., Krinner, L. & Ospelkaus, C., Dec 2025, In: Micro and Nano Engineering. 29, 100336.

    Research output: Contribution to journal › Article › Research › peer review

  3. Published

    Coherent spectroscopy with a single antiproton spin

    Latacz, B. M., Erlewein, S. R., Fleck, M., Jäger, J. I., Abbass, F., Arndt, B. P., Geissler, P., Imamura, T., Leonhardt, M., Micke, P., Mooser, A., Schweitzer, D., Voelksen, F., Wursten, E., Yildiz, H., Blaum, K., Devlin, J. A., Matsuda, Y., Ospelkaus, C., Quint, W., Soter, A., Walz, J., Yamazaki, Y., Smorra, C. & Ulmer, S., 7 Aug 2025, In: NATURE. 644, 8075, p. 64-68 5 p.

    Research output: Contribution to journal › Article › Research › peer review

  4. Published

    Towards g-factor measurements of (anti-)protons using techniques based on quantum logic spectroscopy

    Poljakov, N., Schaper, J., Coenders, J. A., Cornejo, J. M., Ulmer, S. & Ospelkaus, C., 7 Jul 2025, In: Proceedings of Science. 480, 102.

    Research output: Contribution to journal › Conference article › Research › peer review

  5. Published

    Proton transport from the antimatter factory of CERN

    Leonhardt, M., Schweitzer, D., Abbass, F., Anjum, K. K., Arndt, B., Erlewein, S., Endoh, S., Geissler, P., Imamura, T., Jäger, J. I., Latacz, B. M., Micke, P., Voelksen, F., Yildiz, H., Blaum, K., Devlin, J. A., Matsuda, Y., Ospelkaus, C., Quint, W., Soter, A., Walz, J., Yamazaki, Y., Ulmer, S. & Smorra, C., 14 May 2025, In: NATURE. 641, p. 871-875 5 p.

    Research output: Contribution to journal › Article › Research › peer review

  6. Published

    Speeding up adiabatic ion transport in macroscopic multi-Penning-trap stacks for high-precision experiments

    von Boehn, M., Schaper, J., Coenders, J. A., Brombacher, J., Meiners, T., Niemann, M., Cornejo, J. M., Ulmer, S. & Ospelkaus, C., 19 Mar 2025, In: Communications Physics. 8, 1, 107.

    Research output: Contribution to journal › Article › Research › peer review

  7. Published

    A Cryo-BiCMOS Controller for 9Be+-Trapped-Ion-Based Quantum Computers

    Toth, P., Shine, P. E., Halama, S., Kudabay, Y., Yamashit, K., Ishikuro, H., Ospelkaus, C. & Issakov, V., 16 Feb 2025, 2025 IEEE International Solid-State Circuits Conference, ISSCC 2025. Institute of Electrical and Electronics Engineers Inc., (Digest of Technical Papers - IEEE International Solid-State Circuits Conference).

    Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review

  8. Accepted/In press

    A Cryo-BiCMOS Controller for Quantum Computers based on Trapped Beryllium Ions

    Toth, P., Shine Eugine, P., Kudabay, Y., Yamashita, K., Halama, S., Parvizinejad, J., Bonkowski, M., Ishikuro, H., Ospelkaus, C. & Issakov, V., 2025, (Accepted/In press) In: IEEE Journal of Solid-State Circuits.

    Research output: Contribution to journal › Article › Research › peer review

  9. Published

    Automated Electrode Routing Routine for Surface Electrode Paul Traps for Quantum Computing

    Hoffmann, A., Ungerechts, P. F., Munoz Carpio, R. A., Bätge, J., Billah, M. M., Kanz, M., Manteuffel, D. & Ospelkaus, C., 2025.

    Research output: Contribution to conference › Abstract › Research

  10. 2024
  11. Published

    A Direct Digital Synthesizer-Based Arbitrary Waveform Generator for Envelope Modulation in Trapped-Ion Quantum Computer Operating at 4K

    Eugine, P. S., Toth, P., Yamashita, K., Halama, S., Ospelkaus, C., Ishikuro, H. & Issakov, V., 27 Oct 2024, IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium: BCICTS 2024. Institute of Electrical and Electronics Engineers Inc., p. 50-53 4 p.

    Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review

  12. Published

    Resolved-sideband cooling of a single Be + 9 ion in a cryogenic multi-Penning-trap for discrete symmetry tests with (anti-)protons

    Cornejo, J. M., Brombacher, J., Coenders, J. A., Von Boehn, M., Meiners, T., Niemann, M., Ulmer, S. & Ospelkaus, C., 3 Sept 2024, In: Physical Review Research. 6, 3, 033233.

    Research output: Contribution to journal › Article › Research › peer review

  13. Published

    Orders of Magnitude Improved Cyclotron-Mode Cooling for Nondestructive Spin Quantum Transition Spectroscopy with Single Trapped Antiprotons

    BASE Collaboration, B. C., 1 Aug 2024, In: Physical review letters. 133, 5, 6 p., 053201.

    Research output: Contribution to journal › Article › Research › peer review

  14. Published

    A Fully Integrated Three-Channel Cryogenic Microwave SoC for Qubit State Control in 9Be+Trapped-Ion Quantum Computer operating at 4 K

    Toth, P., Eugine, P. S., Meyer, A., Yamashita, K., Halama, S., Duwe, M., Ishikuro, H., Ospelkaus, C. & Issakov, V., 24 Jul 2024, 2024 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2024. Institute of Electrical and Electronics Engineers Inc., p. 239-242 4 p. (Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium).

    Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review

  15. Published

    Image-Current Mediated Sympathetic Laser Cooling of a Single Proton in a Penning Trap Down to 170 mK Axial Temperature

    BASE Collaboration, B. C., 12 Jul 2024, In: Physical review letters. 133, 2, 6 p., 023002.

    Research output: Contribution to journal › Article › Research › peer review

  16. Published

    Arbitrary quantum circuits on a fully integrated two-qubit computation register for a trapped-ion quantum processor

    Pulido-Mateo, N., Mendpara, H., Duwe, M., Dubielzig, T., Zarantonello, G., Krinner, L. & Ospelkaus, C., 24 Jun 2024, In: Physical Review Research. 6, 2, 7 p., L022067.

    Research output: Contribution to journal › Letter › Research › peer review

  17. Published

    Penning micro-trap for quantum computing

    Jain, S., Sägesser, T., Hrmo, P., Torkzaban, C., Stadler, M., Oswald, R., Axline, C., Bautista-Salvador, A., Ospelkaus, C., Kienzler, D. & Home, J., 21 Mar 2024, In: NATURE. 627, p. 510-514 5 p.

    Research output: Contribution to journal › Article › Research › peer review

  18. Published

    Fast adiabatic transport of single laser-cooled 9Be+ ions in a cryogenic Penning trap stack

    Meiners, T., Coenders, J. A., Brombacher, J., Niemann, M., Cornejo, J. M., Ulmer, S. & Ospelkaus, C., 15 Mar 2024, In: European Physical Journal Plus. 139, 3, 10 p., 262.

    Research output: Contribution to journal › Article › Research › peer review

  19. Published

    Matching Network for a High Fidelity Microwave Surface-Electrode in a Trapped-Ion Quantum Processors

    Hoffmann, A., Ungerechts, P. F., Munoz Carpio, R. A., Bätge, J., Meiners, T., Kaune, B. I. E. & Ospelkaus, C., 15 Mar 2024.

    Research output: Contribution to conference › Abstract › Research

  20. 2023
  21. Published

    BASE-STEP: A transportable antiproton reservoir for fundamental interaction studies

    Smorra, C., Abbass, F., Schweitzer, D., Bohman, M., Devine, J. D., Dutheil, Y., Hobl, A., Arndt, B., Bauer, B. B., Devlin, J. A., Erlewein, S., Fleck, M., Jäger, J. I., Latacz, B. M., Micke, P., Schiffelholz, M., Umbrazunas, G., Wiesinger, M., Will, C., Wursten, E., Yildiz, H., Blaum, K., Matsuda, Y., Mooser, A., Ospelkaus, C., Quint, W., Soter, A., Walz, J., Yamazaki, Y. & Ulmer, S., Nov 2023, In: Review of scientific instruments. 94, 11, 18 p., 113201.

    Research output: Contribution to journal › Article › Research › peer review

  22. Published

    Ultra-thin polymer foil cryogenic window for antiproton deceleration and storage

    Latacz, B. M., Arndt, B. P., Devlin, J. A., Erlewein, S. R., Fleck, M., Jäger, J. I., Micke, P., Umbrazunas, G., Wursten, E., Abbass, F., Schweitzer, D., Wiesinger, M., Will, C., Yildiz, H., Blaum, K., Matsuda, Y., Mooser, A., Ospelkaus, C., Smorra, C., Sótér, A., Quint, W., Walz, J., Yamazaki, Y. & Ulmer, S., Oct 2023, In: Review of scientific instruments. 94, 10, 12 p., 103310.

    Research output: Contribution to journal › Article › Research › peer review

  23. Published

    Optical stimulated-Raman sideband spectroscopy of a single ^9Be^+ ion in a Penning trap

    Cornejo, J. M., Brombacher, J., Coenders, J. A., Von Boehn, M., Meiners, T., Niemann, M., Ulmer, S. & Ospelkaus, C., 28 Sept 2023, In: Physical Review Research. 5, 3, 6 p., 033226.

    Research output: Contribution to journal › Article › Research › peer review

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