Michael Drewsen

Aarhus University

*This is an algorithmically generated author record based on publicly available information.

See Latest Publications

See Most Cited Publications

SciProfiles

ORCID Profile

Google Scholar

Current Organizations / Institutes

The organizations/institutes from the scholar's latest article

Aarhus University

Previous Organizations / Institutes

The organizations / institutes from the scholar's other articles in the past ten years

Research Subjects

Research Interests

Michael Drewsen has a total of 222 co-authors. Here are the top co-authors by number of shared publications:

Aurélien Dantan
Department of Physics and Astronomy Aarhus University DK-8000 Aarhus C Denmark
17 shared publications
A. Mortensen
QUANTOP, Danish National Research Foundation Center for Quantum Optics, Department of Physics and Astronomy, University of Aarhus, Århus C., Denmark
8 shared publications
Anders Kragh Hansen
Technical University of Denmark
8 shared publications
Magnus Albert
Department of Physics and Astronomy, Aarhus University, Aarhus C, Denmark
8 shared publications
A. Windberger
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
7 shared publications
Aurélien Dantan
Department of Physics and Astronomy Aarhus University DK-8000 Aarhus C Denmark
7 shared publications

Latest Publications

Sort by

Open Access
Website
Google Scholar
Cited by 1
- 16 April 2026
- Published by American Physical Society (APS) in Physical Review A
Rotational excitation in sympathetic cooling of diatomic molecular ions by laser-cooled atomic ions
by J. Martin Berglund, Michael Drewsen, Christiane P. Koch
Sympathetic cooling of molecular ions through the Coulomb interaction with laser-cooled atomic ions is an efficient tool to prepare translationally cold molecules without, ideally, affecting the internal state of the molecular ions. However, the electric field due to the Coulomb interaction may induce rotational transitions that change the purity of initially quantum state prepared molecules. Here, we use estimates of rotational state changes in single collisions of diatomic ions with atomic ions [J. M. Berglund, M. Drewsen, and C. P. Koch, ] to determine the overall rotational excitation accumulated over the sympathetic cooling. Considering two different experimental scenarios, that of a molecular ion cotrapped with a single atomic ion and a molecular ion immersed in a Coulomb crystal of atomic ions, we also estimate the cooling time.
Website
Google Scholar
- 16 April 2026
- Published by American Physical Society (APS) in Physical Review A
Open Access
Rotational excitation in sympathetic cooling of diatomic molecular ions by laser-cooled atomic ions
by J. Martin Berglund, Michael Drewsen, Christiane P. Koch
Sympathetic cooling of molecular ions through the Coulomb interaction with laser-cooled atomic ions is an efficient tool to prepare translationally cold molecules without, ideally, affecting the internal state of the molecular ions. However, the electric field due to the Coulomb interaction may induce rotational transitions that change the purity of initially quantum state prepared molecules. Here, we use estimates of rotational state changes in single collisions of diatomic ions with atomic ions [J. M. Berglund, M. Drewsen, and C. P. Koch, ] to determine the overall rotational excitation accumulated over the sympathetic cooling. Considering two different experimental scenarios, that of a molecular ion cotrapped with a single atomic ion and a molecular ion immersed in a Coulomb crystal of atomic ions, we also estimate the cooling time.
Cited by 1
Website
Google Scholar
Cited by 1
- 16 April 2026
- Published by American Physical Society (APS) in Physical Review A
Rotational state changes in collisions of diatomic molecular ions with atomic ions
by J. Martin Berglund, Michael Drewsen, Christiane P. Koch
Website
Google Scholar
- 16 April 2026
- Published by American Physical Society (APS) in Physical Review A
Rotational state changes in collisions of diatomic molecular ions with atomic ions
by J. Martin Berglund, Michael Drewsen, Christiane P. Koch
Cited by 1
Website
Google Scholar
Cited by 3
- 9 March 2026
- Published by American Physical Society (APS) in Reviews of Modern Physics
Ion Coulomb crystals: An exotic form of condensed matter
by Giovanna Morigi, John Bollinger, Michael Drewsen, Daniel Podolsky, Efrat Shimshoni
Website
Google Scholar
- 9 March 2026
- Published by American Physical Society (APS) in Reviews of Modern Physics
Ion Coulomb crystals: An exotic form of condensed matter
by Giovanna Morigi, John Bollinger, Michael Drewsen, Daniel Podolsky, Efrat Shimshoni
Cited by 3
Website
Google Scholar
Cited by 5
- 9 June 2022
- Published by American Physical Society (APS) in Physical Review A
Unresolved sideband photon recoil spectroscopy of molecular ions
by Emilie H. Clausen, Vincent Jarlaud, Karin Fisher, Steffen Meyer, Cyrille Solaro, Michael Drewsen
We reflect on the prospect of exploiting the recoil associated with absorption and emission of photons to perform spectroscopy of a single molecular ion. For this recoil to be detectable, the molecular ion is sympathetically cooled by a laser-cooled atomic ion to near their common quantum-mechanical ground state within a trapping potential. More specifically, we present a general framework for simulating the expected photon recoil spectra in regimes where either the natural transition linewidth $Γ_{t}$ of the molecular ion or the spectral width $Γ_{L}$ of the exciting light source exceeds the motional frequencies of the two-ion system. To exemplify the framework, we present two complementary cases: spectroscopy of the broad $3 s {}^{2}S_{1 / 2} - 3 p {}^{2}P_{3 / 2}$ electronic transition ( $Γ_{t} / 2 π = 41.8 M Hz$ ) of a single ${}^{24}{Mg}^{+}$ ion at $λ = 279.6$ nm by a narrow laser source $(Γ_{L} / 2 π ≲ 1 MHz)$ and mid-infrared vibrational spectroscopy of the very narrow $| v = 0, J = 1 〉 - | v^{'} = 1, J^{'} = 0 〉$ transition $(Γ_{t} / 2 π = 2.50 Hz)$ at $λ = 6.17 μ m$ in the ${}^{1}Σ^{+}$ electronic ground state of ${}^{24}{MgH}^{+}$ by a broadband laser source $(Γ_{L} / 2 π ≳ 50 MHz)$ . The atomic ion ${}^{24}{Mg}^{+}$ has been picked to introduce a simple system to make comparisons with experimental results while still capturing most of the physics involved in electronic excitations of molecular ions.
Website
Google Scholar
- 9 June 2022
- Published by American Physical Society (APS) in Physical Review A
Unresolved sideband photon recoil spectroscopy of molecular ions
by Emilie H. Clausen, Vincent Jarlaud, Karin Fisher, Steffen Meyer, Cyrille Solaro, Michael Drewsen
We reflect on the prospect of exploiting the recoil associated with absorption and emission of photons to perform spectroscopy of a single molecular ion. For this recoil to be detectable, the molecular ion is sympathetically cooled by a laser-cooled atomic ion to near their common quantum-mechanical ground state within a trapping potential. More specifically, we present a general framework for simulating the expected photon recoil spectra in regimes where either the natural transition linewidth $Γ_{t}$ of the molecular ion or the spectral width $Γ_{L}$ of the exciting light source exceeds the motional frequencies of the two-ion system. To exemplify the framework, we present two complementary cases: spectroscopy of the broad $3 s {}^{2}S_{1 / 2} - 3 p {}^{2}P_{3 / 2}$ electronic transition ( $Γ_{t} / 2 π = 41.8 M Hz$ ) of a single ${}^{24}{Mg}^{+}$ ion at $λ = 279.6$ nm by a narrow laser source $(Γ_{L} / 2 π ≲ 1 MHz)$ and mid-infrared vibrational spectroscopy of the very narrow $| v = 0, J = 1 〉 - | v^{'} = 1, J^{'} = 0 〉$ transition $(Γ_{t} / 2 π = 2.50 Hz)$ at $λ = 6.17 μ m$ in the ${}^{1}Σ^{+}$ electronic ground state of ${}^{24}{MgH}^{+}$ by a broadband laser source $(Γ_{L} / 2 π ≳ 50 MHz)$ . The atomic ion ${}^{24}{Mg}^{+}$ has been picked to introduce a simple system to make comparisons with experimental results while still capturing most of the physics involved in electronic excitations of molecular ions.
Cited by 5
Open Access
Website
Google Scholar
- 10 February 2022
- Published by arXiv in arXiv
Unresolved sideband photon recoil spectroscopy of molecular ions
by Emilie H. Clausen, Vincent Jarlaud, Karin Fisher, Steffen Meyer, Cyrille Solaro, Michael Drewsen
We reflect on the prospect of exploiting the recoil associated with absorption and emission of photons to perform spectroscopy of a single molecular ion. For this recoil to be detectable, the molecular ion is sympathetically cooled by a laser-cooled atomic ion to near their common quantum mechanical ground state within a trapping potential. More specifically, we present a general framework for simulating the expected photon recoil spectra in regimes where either the natural transition linewidth $\Gamma_t$ of the molecular ion or the spectral width $\Gamma_L$ of the exciting light source exceeds the motional frequencies of the two-ion system. To exemplify the framework, we present two complementary cases: spectroscopy of the broad 3s $^2$S$_{1/2}$ - 3p $^2$P$_{3/2}$ electronic transition ($\Gamma_t/2\pi = 41.8$ MHz) of a single $^{24}$Mg$^+$ ion at $\lambda=279.6$ nm by a narrow laser source ($\Gamma_L/2\pi \lesssim 1$ MHz) and mid-infrared vibrational spectroscopy of the very narrow $|v=0,J=1\rangle$ - $|v'=1,J'=0\rangle$ transition ($\Gamma_t/2\pi = 2.50 $ Hz) at $\lambda=6.17$ $\mu$m in the $^1\Sigma^+$ electronic ground state of $^{24}$MgH$^+$ by a broadband laser source ($\Gamma_L/2\pi \gtrsim$ 50 MHz). The atomic ion $^{24}$Mg$^+$ has been picked to introduce a simple system to make comparisons with experimental results while still capturing most of the physics involved in electronic excitations of molecular ions.
Website
Google Scholar
- 10 February 2022
- Published by arXiv in arXiv
Open Access
Unresolved sideband photon recoil spectroscopy of molecular ions
by Emilie H. Clausen, Vincent Jarlaud, Karin Fisher, Steffen Meyer, Cyrille Solaro, Michael Drewsen
We reflect on the prospect of exploiting the recoil associated with absorption and emission of photons to perform spectroscopy of a single molecular ion. For this recoil to be detectable, the molecular ion is sympathetically cooled by a laser-cooled atomic ion to near their common quantum mechanical ground state within a trapping potential. More specifically, we present a general framework for simulating the expected photon recoil spectra in regimes where either the natural transition linewidth $\Gamma_t$ of the molecular ion or the spectral width $\Gamma_L$ of the exciting light source exceeds the motional frequencies of the two-ion system. To exemplify the framework, we present two complementary cases: spectroscopy of the broad 3s $^2$S$_{1/2}$ - 3p $^2$P$_{3/2}$ electronic transition ($\Gamma_t/2\pi = 41.8$ MHz) of a single $^{24}$Mg$^+$ ion at $\lambda=279.6$ nm by a narrow laser source ($\Gamma_L/2\pi \lesssim 1$ MHz) and mid-infrared vibrational spectroscopy of the very narrow $|v=0,J=1\rangle$ - $|v'=1,J'=0\rangle$ transition ($\Gamma_t/2\pi = 2.50 $ Hz) at $\lambda=6.17$ $\mu$m in the $^1\Sigma^+$ electronic ground state of $^{24}$MgH$^+$ by a broadband laser source ($\Gamma_L/2\pi \gtrsim$ 50 MHz). The atomic ion $^{24}$Mg$^+$ has been picked to introduce a simple system to make comparisons with experimental results while still capturing most of the physics involved in electronic excitations of molecular ions.
Website
Google Scholar
Cited by 100
- 15 September 2020
- Published by American Physical Society (APS) in Physical Review Letters
Improved Isotope-Shift-Based Bounds on Bosons beyond the Standard Model through Measurements of the ${{}^{2}D}_{3 / 2} - {{}^{2}D}_{5 / 2}$ Interval in ${Ca}^{+}$
by Cyrille Solaro, Steffen Meyer, Karin Fisher, Julian C. Berengut, Elina Fuchs, Michael Drewsen
We perform high-resolution spectroscopy of the $3 d {{}^{2}D}_{3 / 2} - 3 d {{}^{2}D}_{5 / 2}$ interval in all stable even isotopes of ${}^{A}{Ca}^{+}$ ( $A = 40$ , 42, 44, 46, and 48) with an accuracy of $\sim 20 Hz$ using direct frequency-comb Raman spectroscopy. Combining these data with isotope shift measurements of the $4 s {{}^{2}S}_{1 / 2} \leftrightarrow 3 d {{}^{2}D}_{5 / 2}$ transition, we carry out a King plot analysis with unprecedented sensitivity to coupling between electrons and neutrons by bosons beyond the standard model. Furthermore, we estimate the sensitivity to such bosons from equivalent spectroscopy in ${Ba}^{+}$ and ${Yb}^{+}$ . Finally, the data yield isotope shifts of the $4 s {{}^{2}S}_{1 / 2} \leftrightarrow 3 d {{}^{2}D}_{3 / 2}$ transition at 10 parts per billion through combination with recent data of Knollmann, Patel, and Doret [ Phys. Rev. A 100, 022514 (2019)].
Website
Google Scholar
- 15 September 2020
- Published by American Physical Society (APS) in Physical Review Letters
Improved Isotope-Shift-Based Bounds on Bosons beyond the Standard Model through Measurements of the ${{}^{2}D}_{3 / 2} - {{}^{2}D}_{5 / 2}$ Interval in ${Ca}^{+}$
by Cyrille Solaro, Steffen Meyer, Karin Fisher, Julian C. Berengut, Elina Fuchs, Michael Drewsen
We perform high-resolution spectroscopy of the $3 d {{}^{2}D}_{3 / 2} - 3 d {{}^{2}D}_{5 / 2}$ interval in all stable even isotopes of ${}^{A}{Ca}^{+}$ ( $A = 40$ , 42, 44, 46, and 48) with an accuracy of $\sim 20 Hz$ using direct frequency-comb Raman spectroscopy. Combining these data with isotope shift measurements of the $4 s {{}^{2}S}_{1 / 2} \leftrightarrow 3 d {{}^{2}D}_{5 / 2}$ transition, we carry out a King plot analysis with unprecedented sensitivity to coupling between electrons and neutrons by bosons beyond the standard model. Furthermore, we estimate the sensitivity to such bosons from equivalent spectroscopy in ${Ba}^{+}$ and ${Yb}^{+}$ . Finally, the data yield isotope shifts of the $4 s {{}^{2}S}_{1 / 2} \leftrightarrow 3 d {{}^{2}D}_{3 / 2}$ transition at 10 parts per billion through combination with recent data of Knollmann, Patel, and Doret [ Phys. Rev. A 100, 022514 (2019)].
Cited by 100
Open Access
Website
Google Scholar
Cited by 42
- 1 June 2020
- Published by American Physical Society (APS) in Physical Review A
Efficient and robust chiral resolution by composite pulses
by Boyan T. Torosov, Michael Drewsen, Nikolay V. Vitanov
We introduce a method for the detection of chiral molecules using sequences of three pulses driving a closed-loop three-state quantum system. The left- and right-handed enantiomers have identical optical properties (transition frequencies and transition dipole moments) with the only difference being the sign of one of the couplings. We identify 12 different sequences of resonant pulses for which chiral resolution with perfect contrast occurs. In all of them, the first and third pulses are $π / 2$ pulses and the middle pulse is a $π$ pulse. In addition, one of the three pulses must have a phase shift of $π / 2$ with respect to the other two. The simplicity of the proposed chiral resolution technique allows for straightforward extensions to more efficient and more robust implementations by replacing the single $π / 2$ and $π$ pulses by composite pulses. We present specific examples of chiral resolution by composite pulses which compensate errors in the pulse areas and the detuning of the driving fields.
Website
Google Scholar
- 1 June 2020
- Published by American Physical Society (APS) in Physical Review A
Open Access
Efficient and robust chiral resolution by composite pulses
by Boyan T. Torosov, Michael Drewsen, Nikolay V. Vitanov
We introduce a method for the detection of chiral molecules using sequences of three pulses driving a closed-loop three-state quantum system. The left- and right-handed enantiomers have identical optical properties (transition frequencies and transition dipole moments) with the only difference being the sign of one of the couplings. We identify 12 different sequences of resonant pulses for which chiral resolution with perfect contrast occurs. In all of them, the first and third pulses are $π / 2$ pulses and the middle pulse is a $π$ pulse. In addition, one of the three pulses must have a phase shift of $π / 2$ with respect to the other two. The simplicity of the proposed chiral resolution technique allows for straightforward extensions to more efficient and more robust implementations by replacing the single $π / 2$ and $π$ pulses by composite pulses. We present specific examples of chiral resolution by composite pulses which compensate errors in the pulse areas and the detuning of the driving fields.
Cited by 42
Open Access
Website
Google Scholar
- 1 May 2020
- Published by arXiv in arXiv
Improved isotope-shift-based bounds on bosons beyond the Standard Model through measurements of the $^2$D$_{3/2} - ^2$D$_{5/2}$ interval in Ca$^+$
by Cyrille Solaro, Steffen Meyer, Karin Fisher, Julian C. Berengut, Elina Fuchs, Michael Drewsen
We perform high-resolution spectroscopy of the $3$d$~^2$D$_{3/2} - 3$d$~^2$D$_{5/2}$ interval in all stable even isotopes of $^A$Ca$^+$ (A = 40, 42, 44, 46 and 48) with an accuracy of $\sim$ 20 Hz using direct frequency-comb Raman spectroscopy. Combining these data with isotope shift measurements of the 4s$~^2$S$_{1/2} \leftrightarrow 3$d$~^2$D$_{5/2}$ transition, we carry out a King plot analysis with unprecedented sensitivity to coupling between electrons and neutrons by bosons beyond the Standard Model. Furthermore, we estimate the sensitivity to such bosons from equivalent spectroscopy in Ba$^+$ and Yb$^+$. Finally, the data yield isotope shifts of the 4s$~^2$S$_{1/2} \leftrightarrow 3$d$~^2$D$_{3/2}$ transition at 10 part-per-billion through combination with recent data of Knollmann et al (2019).
Website
Google Scholar
- 1 May 2020
- Published by arXiv in arXiv
Open Access
Improved isotope-shift-based bounds on bosons beyond the Standard Model through measurements of the $^2$D$_{3/2} - ^2$D$_{5/2}$ interval in Ca$^+$
by Cyrille Solaro, Steffen Meyer, Karin Fisher, Julian C. Berengut, Elina Fuchs, Michael Drewsen
We perform high-resolution spectroscopy of the $3$d$~^2$D$_{3/2} - 3$d$~^2$D$_{5/2}$ interval in all stable even isotopes of $^A$Ca$^+$ (A = 40, 42, 44, 46 and 48) with an accuracy of $\sim$ 20 Hz using direct frequency-comb Raman spectroscopy. Combining these data with isotope shift measurements of the 4s$~^2$S$_{1/2} \leftrightarrow 3$d$~^2$D$_{5/2}$ transition, we carry out a King plot analysis with unprecedented sensitivity to coupling between electrons and neutrons by bosons beyond the Standard Model. Furthermore, we estimate the sensitivity to such bosons from equivalent spectroscopy in Ba$^+$ and Yb$^+$. Finally, the data yield isotope shifts of the 4s$~^2$S$_{1/2} \leftrightarrow 3$d$~^2$D$_{3/2}$ transition at 10 part-per-billion through combination with recent data of Knollmann et al (2019).
Website
Google Scholar
Cited by 1
- 25 February 2020
- Published by SPIE-Intl Soc Optical Eng
High-resolution direct optical frequency comb Raman spectroscopy of single ions: from atomic fine structures to rotational spectra of molecular ions
by Michael Drewsen
Optical frequency combs have in the recent past revolutionized the field of high-resolution spectroscopy by being applied both as frequency references and light sources for direct comb spectroscopy. With respect to the latter application, we have demonstrated the use of an optical frequency comb to coherently drive stimulated Raman transitions between terahertz-spaced atomic energy levels. Specifically, we have measured the 3d 2D3/2 - 3d 2D5/2 fine structure splitting of a single trapped 40Ca+ ion to be 1,819,599,021,534±8Hz, which is five times more accurate than previous measurements, and currently only limited by the stability of our atomic clock reference. Furthermore, Rabi oscillations with a contrast of 99.3(6)% and millisecond coherence time have been realized experimentally, indicating great potentials for future qubit applications. Importantly, the technique should generally be applicable to drive Raman transitions spanning the level spacings ranging from sub-kHz to tens of THz range, including hyperfine transitions in highly charged ions and spin-resolved rovibrational transitions in molecular ions. High-resolution spectroscopy of such systems may find applications in the search for new physics beyond the Standard Model.
Website
Google Scholar
- 25 February 2020
- Published by SPIE-Intl Soc Optical Eng
High-resolution direct optical frequency comb Raman spectroscopy of single ions: from atomic fine structures to rotational spectra of molecular ions
by Michael Drewsen
Optical frequency combs have in the recent past revolutionized the field of high-resolution spectroscopy by being applied both as frequency references and light sources for direct comb spectroscopy. With respect to the latter application, we have demonstrated the use of an optical frequency comb to coherently drive stimulated Raman transitions between terahertz-spaced atomic energy levels. Specifically, we have measured the 3d 2D3/2 - 3d 2D5/2 fine structure splitting of a single trapped 40Ca+ ion to be 1,819,599,021,534±8Hz, which is five times more accurate than previous measurements, and currently only limited by the stability of our atomic clock reference. Furthermore, Rabi oscillations with a contrast of 99.3(6)% and millisecond coherence time have been realized experimentally, indicating great potentials for future qubit applications. Importantly, the technique should generally be applicable to drive Raman transitions spanning the level spacings ranging from sub-kHz to tens of THz range, including hyperfine transitions in highly charged ions and spin-resolved rovibrational transitions in molecular ions. High-resolution spectroscopy of such systems may find applications in the search for new physics beyond the Standard Model.
Cited by 1
Website
Google Scholar
Cited by 9
- 30 October 2019
- Published by American Physical Society (APS) in Physical Review E
Quantum duets working as autonomous thermal motors
by Michael Drewsen, Alberto Imparato
We study the dynamic properties of a thermal autonomous machine made up of two quantum Brownian particles, each of which is in contact with an environment at different temperature and moves on a periodic sinusoidal track. When such tracks are shifted, the center of mass of the system exhibits a nonvanishing velocity, for which we provide an exact expression in the limit of small track undulations. We discuss the role of the broken spatial symmetry in the emergence of directed motion in thermal machines. We then consider the case in which external deterministic forces are applied to the system, and we characterize its steady-state velocity. If the applied external force opposes the system motion, work can be extracted from such a steady-state thermal machine, without any external cyclic protocol. When the two particles are not interacting, our results reduce to those of Fisher and Zwerger [ Phys. Rev. B 32, 6190 (1985)] and Aslangul, Pottier, and Saint-James [ J. Phys. France 48, 1093 (1987)] for a single particle moving in a periodic tilted potential. We finally use our results for the motor velocity to check the validity of the quantum molecular dynamics algorithm in the nonlinear, nonequilibrium regime.
Website
Google Scholar
- 30 October 2019
- Published by American Physical Society (APS) in Physical Review E
Quantum duets working as autonomous thermal motors
by Michael Drewsen, Alberto Imparato
We study the dynamic properties of a thermal autonomous machine made up of two quantum Brownian particles, each of which is in contact with an environment at different temperature and moves on a periodic sinusoidal track. When such tracks are shifted, the center of mass of the system exhibits a nonvanishing velocity, for which we provide an exact expression in the limit of small track undulations. We discuss the role of the broken spatial symmetry in the emergence of directed motion in thermal machines. We then consider the case in which external deterministic forces are applied to the system, and we characterize its steady-state velocity. If the applied external force opposes the system motion, work can be extracted from such a steady-state thermal machine, without any external cyclic protocol. When the two particles are not interacting, our results reduce to those of Fisher and Zwerger [ Phys. Rev. B 32, 6190 (1985)] and Aslangul, Pottier, and Saint-James [ J. Phys. France 48, 1093 (1987)] for a single particle moving in a periodic tilted potential. We finally use our results for the motor velocity to check the validity of the quantum molecular dynamics algorithm in the nonlinear, nonequilibrium regime.
Cited by 9

Show all