Karshenboim, S. G.; Shelyuto, V. A.: Hadronic vacuum-polarization contribution to various QED observables. European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics 75 (2), 49 (2021)

Karshenboim, S. G.; Korzinin, E. Y.: Theoretical prediction for the muonium hyperfine-structure interval and its accuracy. Physical Review A 103 (2), 022805 (2021)

Nörtershäuser, W.; Surzhykov, A.; Sanchez, R.; Botermann, B.; Gwinner, G.; Huber, G.; Karpuk, S.; Kühl, T.; Novotny, C.; Reinhardt, S. et al.; Saathoff, G.; Stöhlker, T.; Wolf, A.: Polarization-dependent disappearance of a resonance signal: Indication for optical pumping in a storage ring? Physical Review Accelerators and Beams 24 (2), 024701 (2021)

Krauth, J. J.; Schuhmann, K.; Ahmed, M. A.; Amaro, F. D.; Amaro, P.; Biraben, F.; Chen, T.-L.; Covita, D. S.; Dax, A. J.; Diepold, M. et al.; Fernandes, L. M. P.; Franke, B.; Galtier, S.; Gouvea, A. L.; Götzfried , J.; Graf, T.; Hänsch, T. W.; Hartmann, J.; Hildebrandt, M.; Indelicato, P.; Julien, L.; Kirch, K.; Knecht, A.; Liu, Y.-W.; Machado, J.; Monteiro, C. M. B.; Mulhauser , F.; Naar, B.; Nebel, T.; Nez, F.; dos Santos, J. M. F.; Santos, J. P.; Szabo, C. I.; Taqqu, D.; Veloso, J. F. C. A.; Vogelsang, J.; Voss, A.; Weichelt, B.; Pohl, R.; Antognini, A.; Kottmann, F.: Measuring the α-particle charge radius with muonic helium-4 ions. Nature 589 (7843), S. 527 - 531 (2021)

Zhao, F.; Lo Curto, G.; Pasquini, L.; Gonzalez Hernandez I, J.; De Medeiros, J. R.; Canto Martins, B. L.; Leao, I. C.; Rebolo, R.; Suarez Mascareno, A.; Esposito, M. et al.; Manescau, A.; Steinmetz, T.; Udem, T.; Probst, R.; Holzwarth, R.; Zhao, G.: Measuring and characterizing the line profile of HARPS with a laser frequency comb. Astrophysics & Astronomy 645, A23 (2021)

van Loock, P.; Alt, W.; Becher, C.; Benson, O.; Boche, H.; Deppe, C.; Eschner, J.; Höfling, S.; Meschede, D.; Michler, P. et al.; Schmidt, F.; Weinfurter, H.: Extending Quantum Links: Modules for Fiber- and Memory-Based Quantum Repeaters. Advanced Quantum Technologies, 1900141 (2020)

Grinin, A.; Matveev, A. N.; Yost, D. C.; Maisenbacher, L.; Wirthl , V.; Pohl, R.; Hänsch, T. W.; Udem, T.: Two-photon frequency comb spectroscopy of atomic hydrogen. Science 370 (6520), S. 1061 - 1066 (2020)

Hernández, J. I. G.; Rebolo, R.; Pasquini, L.; Curto, G. L.; Molaro, P.; Caffau, E.; Ludwig, H.-G.; Steffen, M.; Esposito, M.; Mascareño, A. S. et al.; Toledo-Padrón, B.; Probst, R. A.; Hänsch, T. W.; Holzwarth, R.; Manescau, A.; Steinmetz, T.; Udem, T.; Wilken, T.: The Solar Gravitational Redshift from HARPS-LFC Moon Spectra A Test of the General Theory of Realitivity*^,**. Astronomy and Astrophysics 643, A146 (2020)

Picqué, N.; Hänsch, T. W.: Photon-level broadband spectroscopy and interferometry with two frequency combs. Proceedings of the National Academy of Sciences of the United States of America 117 (43), S. 26688 - 26691 (2020)

Hori, M.: High-precision molecular measurement. Science 369 (6508), S. 1160 - 1161 (2020)

Buhin, D.; Kovačić, D.; Schmid, F.; Kruljac, M.; Vulić, V.; Ban, T.; Aumiler, D.: Simultaneous dual-species laser cooling using an optical frequency comb. Physical Review A 102 (2), 021101(R) (2020)

Diddams, S. A.; Vahala, K.; Udem, T.: Optical frequency combs: Coherently uniting the electromagnetic spectrum. Science 369 (6501), S. 267 - 267 (2020)

von der Wense, L.; Bilous, P. V.; Seiferle, B.; Stellmer, S.; Weitenberg, J.; Thirolf, P. G.; Palffy, A.; Kazakov, G.: The theory of direct laser excitation of nuclear transitions. European Physical Journal A 56 (7), 176 (2020)

Hori, M.; Aghai-Khozani, H.; Soter, A.; Dax, A.; Barna, D.: Laser spectroscopy of pionic helium atoms. Nature 581 (7806), S. 37 - 41 (2020)

Giunta, M.; Yu, J.; Lessing, M.; Fischer, M.; Lezius, M.; Xie, X.; Santarelli, G.; Le Coq, Y.; Holzwarth, R.: Compact and ultrastable photonic microwave oscillator. Optics Letters 45 (5), S. 1140 - 1143 (2020)

Rosolek, K.; Wiesniak, M.; Knips, L.: Quadratic Entanglement Criteria for Qutrits. Acta Physica Polonica A 137 (3), S. 374 - 378 (2020)

Probst, R. A.; Milakovic, D.; Toledo-Padron, B.; Lo Curto, G.; Avila, G.; Brucalassi, A.; Canto Martins, B. L.; Leao, I. d. C.; Esposito, M.; Gonzalez Hernandez I, J. et al.; Grupp, F.; Hänsch, T. W.; Kellermann, H.; Kerber, F.; Mandel, O.; Manescau, A.; Pozna, E.; Rebolo, R.; de Medeiros, J. R.; Steinmetz, T.; Suarez Mascareno, A.; Udem, T.; Urrutia, J.; Wu , Y.; Pasquini, L.; Holzwarth, R.: A crucial test for astronomical spectrograph calibration with frequency combs. Nature astronomy 4, S. 603 - 608 (2020)

van Leent, T.; Bock, M.; Garthoff, R.; Redeker, K.; Zhang, W.; Bauer, T.; Rosenfeld, W.; Becher, C.; Weinfurter, H.: Long-Distance Distribution of Atom-Photon Entanglement at Telecom Wavelength. Physical Review Letters 124 (1), 010510 (2020)

Giunta, M.; Hänsel, W.; Fischer, M.; Lezius, M.; Udem, T.; Holzwarth, R.: Real-time phase tracking for wide-band optical frequency measurements at the 20th decimal place. Nature Photonics; Nature Publ. Group , London [u.a.] 14 (1), S. 44 - 49 (2020)

Giunta, M.; Fischer, M.; Hänsel, W.; Steinmetz, T.; Lessing, M.; Holzberger, S.; Cleff, C.; Hänsch, T. W.; Mei, M.; Holzwarth, R.: 20 Years and 20 Decimal Digits: A Journey With Optical Frequency Combs. IEEE Photonics Technology Letters 31 (23), S. 1898 - 1901 (2019)