Publications | Alexander Friedrich

2026

Fermion quantum field theory on curved and non-inertial backgrounds in standard-Minkowski form

F. Di Pumpo, T. Asano, A. Friedrich, and 2 more authors

arXiv, Sep 2026

@article{DiPumpo2026,
  title = {{Fermion quantum field theory on curved and non-inertial backgrounds in standard-Minkowski form}},
  author = {Di Pumpo, F. and Asano, T. and Friedrich, A. and Paz, G. and Giese, E.},
  journal = {arXiv},
  month = sep,
  year = {2026},
}

Opt. Express

Molecular iodine at 508 nm: hyperfine spectroscopy and operating regimes for optical frequency references

M. Weller, K. Rostan, A. Friedrich, and 5 more authors

Optics Express, Aug 2026

DOI Bib HTML

@article{Weller2026,
  title = {{Molecular iodine at 508 nm: hyperfine spectroscopy and operating regimes for optical frequency references}},
  author = {Weller, M. and Rostan, K. and Friedrich, A. and Wüst, J. and Oswald, M. and Kuschewski, F. and Schuldt, T. and Braxmaier, C.},
  journal = {Optics Express},
  publisher = {Optica Publishing Group},
  volume = {34},
  number = {17},
  pages = {31567},
  month = aug,
  year = {2026},
  doi = {10.1364/oe.605121},
}

2025

arXiv

Multi-Photon Quantum Rabi Models with Center-of-Mass Motion

S. Hartmann, N. Momčilović, and A. Friedrich

arXiv, Jul 2025

arXiv Bib HTML

@article{Hartmann2025,
  title = {{Multi-Photon Quantum Rabi Models with Center-of-Mass Motion}},
  author = {Hartmann, S. and Momčilović, N. and Friedrich, A.},
  journal = {arXiv},
  month = jul,
  year = {2025},
}

2024

PRR

Decoupling of external and internal dynamics in driven two-level systems

S. Böhringer and A. Friedrich

Phys. Rev. Res., Nov 2024

DOI arXiv Bib HTML

@article{Boehringer2024,
  title = {{Decoupling of external and internal dynamics in driven two-level systems}},
  author = {Böhringer, S. and Friedrich, A.},
  journal = {Phys. Rev. Res.},
  publisher = {American Physical Society},
  volume = {6},
  issue = {4},
  pages = {043153},
  month = nov,
  year = {2024},
  doi = {10.1103/PhysRevResearch.6.043153},
}

PhD Thesis

Interference of Clocks: Atom Interferometry and Quantum Tests of Relativity

A. Friedrich

Universität Ulm, Oct 2024

DOI Bib HTML

@phdthesis{Friedrich2024,
  title = {{Interference of Clocks: Atom Interferometry and Quantum Tests of Relativity}},
  author = {Friedrich, A.},
  school = {Universit{\"a}t Ulm},
  month = oct,
  year = {2024},
  doi = {10.18725/OPARU-53901},
}

AVS QS

Finite Pulse-Time Effects in Long-Baseline Quantum Clock Interferometry

G. Janson, A. Friedrich, and R. Lopp

AVS Quantum Sci., Jun 2024

DOI arXiv Bib HTML

@article{Janson2024,
  title = {{Finite Pulse-Time Effects in Long-Baseline Quantum Clock Interferometry}},
  author = {Janson, G. and Friedrich, A. and Lopp, R.},
  journal = {AVS Quantum Sci.},
  publisher = {American Vacuum Society},
  volume = {6},
  number = {2},
  pages = {024403},
  month = jun,
  year = {2024},
  doi = {10.1116/5.0178230},
}

AVS QS

Terrestrial very-long-baseline atom interferometry: Workshop summary

S. Abend and others

AVS Quantum Sci., May 2024

DOI Bib HTML

@article{Abend2024,
  title = {{Terrestrial very-long-baseline atom interferometry: Workshop summary}},
  author = {Abend, S. and others},
  journal = {AVS Quantum Sci.},
  publisher = {American Vacuum Society},
  volume = {6},
  number = {2},
  pages = {024701},
  month = may,
  year = {2024},
  doi = {10.1116/5.0185291},
}

AVS QS

Optimal baseline exploitation in vertical dark-matter detectors based on atom interferometry

F. Di Pumpo, A. Friedrich, and E. Giese

AVS Quantum Sci., Mar 2024

DOI arXiv Bib HTML

@article{DiPumpo2024,
  title = {{Optimal baseline exploitation in vertical dark-matter detectors based on atom interferometry}},
  author = {Di Pumpo, F. and Friedrich, A. and Giese, E.},
  journal = {AVS Quantum Sci.},
  publisher = {American Vacuum Society},
  volume = {6},
  number = {1},
  pages = {014404},
  month = mar,
  year = {2024},
  doi = {10.1116/5.0175683},
}

2023

APPA

The Wave Functional of the Vacuum in a Resonator

A. Friedrich, D. Moll, M. Freyberger, and 2 more authors

Acta Phys. Pol. A, Jun 2023

DOI arXiv Bib HTML

@article{Friedrich2023,
  title = {{The Wave Functional of the Vacuum in a Resonator}},
  author = {Friedrich, A. and Moll, D. and Freyberger, M. and Plimak, L. and Schleich, W. P.},
  journal = {Acta Phys. Pol. A},
  volume = {143},
  number = {6},
  pages = {S52--S77},
  issn = {1898-794X},
  month = jun,
  year = {2023},
  doi = {10.12693/APhysPolA.143.S52},
}

PRD

Universality-of-clock-rates test using atom interferometry with T³ scaling

F. Di Pumpo, A. Friedrich, C. Ufrecht, and 1 more author

Phys. Rev. D, Mar 2023

DOI arXiv Bib HTML

@article{DiPumpo2023,
  title = {{Universality-of-clock-rates test using atom interferometry with T³ scaling}},
  author = {Di Pumpo, F. and Friedrich, A. and Ufrecht, C. and Giese, E.},
  journal = {Phys. Rev. D},
  publisher = {American Physical Society},
  volume = {107},
  number = {6},
  pages = {064007},
  issn = {2470-0029},
  month = mar,
  year = {2023},
  doi = {10.1103/PhysRevD.107.064007},
}

2022

EPJ QT

Tunneling Gravimetry

P. Schach, A. Friedrich, J. R. Williams, and 2 more authors

EPJ Quantum Technol., Aug 2022

DOI arXiv Bib HTML

@article{Schach2022,
  title = {{Tunneling Gravimetry}},
  author = {Schach, P. and Friedrich, A. and Williams, J. R. and Schleich, W. P. and Giese, E.},
  journal = {EPJ Quantum Technol.},
  volume = {9},
  number = {1},
  pages = {20},
  month = aug,
  year = {2022},
  doi = {10.1140/epjqt/s40507-022-00140-3},
}

PRD

Light propagation and atom interferometry in gravity and dilaton fields

F. Di Pumpo, A. Friedrich, A. Geyer, and 2 more authors

Phys. Rev. D, Apr 2022

DOI arXiv Bib HTML

@article{DiPumpo2022,
  title = {{Light propagation and atom interferometry in gravity and dilaton fields}},
  author = {Di Pumpo, F. and Friedrich, A. and Geyer, A. and Ufrecht, C. and Giese, E.},
  journal = {Phys. Rev. D},
  publisher = {American Physical Society},
  volume = {105},
  issue = {8},
  pages = {084065},
  numpages = {11},
  month = apr,
  year = {2022},
  doi = {10.1103/PhysRevD.105.084065},
}

2021

PRX Quantum

Gravitational Redshift Tests with Atomic Clocks and Atom Interferometers

F. Di Pumpo, C. Ufrecht, A. Friedrich, and 3 more authors

PRX Quantum, Nov 2021

DOI arXiv Bib HTML

@article{DiPumpo2021,
  title = {{Gravitational Redshift Tests with Atomic Clocks and Atom Interferometers}},
  author = {Di Pumpo, F. and Ufrecht, C. and Friedrich, A. and Giese, E. and Schleich, W. P. and Unruh, W. G.},
  journal = {PRX Quantum},
  publisher = {American Physical Society},
  volume = {2},
  issue = {4},
  pages = {040333},
  numpages = {23},
  month = nov,
  year = {2021},
  doi = {10.1103/PRXQuantum.2.040333},
}

2020

PRR

Atom-interferometric test of the universality of gravitational redshift and free fall

C. Ufrecht, F. Di Pumpo, A. Friedrich, and 6 more authors

Phys. Rev. Res., Nov 2020

DOI arXiv Bib HTML

@article{Ufrecht2020,
  title = {{Atom-interferometric test of the universality of gravitational redshift and free fall}},
  author = {Ufrecht, C. and Di Pumpo, F. and Friedrich, A. and Roura, A. and Schubert, C. and Schlippert, D. and Rasel, E. M. and Schleich, W. P. and Giese, E.},
  journal = {Phys. Rev. Res.},
  publisher = {American Physical Society},
  volume = {2},
  issue = {4},
  pages = {043240},
  numpages = {9},
  month = nov,
  year = {2020},
  doi = {10.1103/PhysRevResearch.2.043240},
}

Prog. Opt.

Specular mirror interferometer

F. Di Pumpo, A. Friedrich, E. Giese, and 5 more authors

In A Tribute to Emil Wolf, 2020

DOI Bib HTML

@incollection{DiPumpo2020,
  title = {{Specular mirror interferometer}},
  author = {Di Pumpo, F. and Friedrich, A. and Giese, E. and Roura, A. and Lemmel, H. and Greenberger, D. M. and Rasel, E. M. and Schleich, W. P.},
  booktitle = {{A Tribute to Emil Wolf}},
  series = {Progress in Optics},
  editor = {Visser, T. D.},
  publisher = {Elsevier},
  volume = {65},
  pages = {173--229},
  issn = {0079-6638},
  year = {2020},
  doi = {10.1016/bs.po.2019.11.006},
}

2019

Sci. Adv.

Interference of clocks: A quantum twin paradox

S. Loriani, A. Friedrich, C. Ufrecht, and 15 more authors

Sci. Adv., Oct 2019

DOI arXiv Bib HTML

@article{Loriani2019,
  title = {{Interference of clocks: A quantum twin paradox}},
  author = {Loriani, S. and Friedrich, A. and Ufrecht, C. and Di Pumpo, F. and Kleinert, S. and Abend, S. and Gaaloul, N. and Meiners, C. and Schubert, C. and Tell, D. and Wodey, {\'{E}}. and Zych, M. and Ertmer, W. and Roura, A. and Schlippert, D. and Schleich, W. P. and Rasel, E. M. and Giese, E.},
  journal = {Sci. Adv.},
  volume = {5},
  number = {10},
  pages = {eaax8966},
  issn = {2375-2548},
  month = oct,
  year = {2019},
  doi = {10.1126/sciadv.aax8966},
}

PRA

Proper time in atom interferometers: Diffractive versus specular mirrors

E. Giese, A. Friedrich, F. Di Pumpo, and 4 more authors

Phys. Rev. A, Jan 2019

DOI arXiv Bib HTML

@article{Giese2019,
  title = {{Proper time in atom interferometers: Diffractive versus specular mirrors}},
  author = {Giese, E. and Friedrich, A. and Di Pumpo, F. and Roura, A. and Schleich, W. P. and Greenberger, D. M. and Rasel, E. M.},
  journal = {Phys. Rev. A},
  publisher = {American Physical Society},
  volume = {99},
  number = {1},
  pages = {013627},
  issn = {2469-9934},
  month = jan,
  year = {2019},
  doi = {10.1103/PhysRevA.99.013627},
}

2016

PRA

Light shifts in atomic Bragg diffraction

E. Giese, A. Friedrich, S. Abend, and 2 more authors

Phys. Rev. A, Dec 2016

DOI arXiv Bib HTML

@article{Giese2016,
  title = {{Light shifts in atomic Bragg diffraction}},
  author = {Giese, E. and Friedrich, A. and Abend, S. and Rasel, E. M. and Schleich, W. P.},
  journal = {Phys. Rev. A},
  publisher = {American Physical Society},
  volume = {94},
  issue = {6},
  pages = {063619},
  numpages = {6},
  month = dec,
  year = {2016},
  doi = {10.1103/PhysRevA.94.063619},
}