⚛️

I experienced the scientific method during my Ph.D. in the team of Dr. Guillaume Labeyrie and Prof. Patrizia Vignolo.

After defending my Ph.D. in september 2011, I joined the group of Prof. Jörg Schmiedmayer in Vienna, Austria, as a postodc.

I then joined the deep tech startup Muquans as its Atomic Clock Technical Leader. The company was acquired by exail in 2021.

# Peer-Reviewed Articles

## Compact cold-atom clock for onboard timebase: tests in reduced gravity

M. Langlois, L. De Sarlo, D. Holleville, N. Dimarcq, J.-F. Schaff, S. Bernon

Physical Review Applied 10, 064007 (2018)

## Matter-wave recombiners for trapped Bose-Einstein condensates

T. Berrada, S. van Frank, R. Bücker, T. Schumm, J.-F. Schaff, J. Schmiedmayer, B. Julía-Díaz and A. Polls

Physical Review A 93, 063620 (2016)

## Interferometry with non-classical motional states of a Bose-Einstein condensate

S. van Frank, A. Negretti, T. Berrada, R. Bücker, S. Montangero, J.-F. Schaff, T. Schumm, T. Calarco, J. Schmiedmayer

Nature Communications 5, 4009 (2014)

## Integrated Mach-Zehnder interferometer for Bose-Einstein condensates

T. Berrada, S. van Frank, R. Bücker, T. Schumm, J.-F. Schaff, and J. Schmiedmayer

Nature Communications 4, 2077 (2013)

[open access article][preprint][press 1][press 2][press 3][press 4]

## Vibrational state inversion of a Bose-Einstein condensate: optimal control and state tomography

R. Bücker, T. Berrada, S. van Frank, J.-F. Schaff, T. Schumm, J. Schmiedmayer, G. Jäger, J. Grond, and U. Hohenester

Journal of Physics B 46, 104012 (2013)

## Enhanced backscattering of a dilute Bose-Einstein condensate

G. Labeyrie, T. Karpiuk, J.-F. Schaff, B. Grémaud, C. Miniatura, and D. Delande

Europhysics Letters 100, 66001 (2012)

## Shortcuts to adiabaticity for trapped ultracold gases

J.-F. Schaff, P. Capuzzi, G. Labeyrie, and P. Vignolo

New Journal of Physics 13, 113017 (2011)

## Shortcut to adiabaticity for an interacting Bose-Einstein condensate

J.-F. Schaff, X.-L. Song, P. Capuzzi, P. Vignolo, and G. Labeyrie

Europhysics Letters 93, 23001 (2011)

## Fast optimal transition between two equilibrium states

J.-F. Schaff, X.-L. Song, P. Vignolo, and G. Labeyrie

Physical Review A 82, 033430 (2010)

[article][preprint][erratum, Physical Review A 83, 059911(E) (2011)]

## Localization-delocalization transition in the random dimer model

J.-F. Schaff, Z. Akdeniz, and P. Vignolo

Physical Review A 81, 041604(R) (2010)

# Lecture Notes

## Interferometry with atoms

J.-F. Schaff, T. Langen, and J. Schmiedmayer

Proceedings of the international school of physics "Enrico Fermi", course 188, Atom Interferomtry, edited by G. M. Tino and M. A. Kasevich (2014)

[preprint]

# Ph.D. Thesis

## Shortcuts to adiabaticity for ultracold gases

J.-F. Schaff, Université de Nice Sophia Antipolis (2011)

In this thesis I explore the possibility of accelerating adiabatic processes for quantum systems. Experiments are performed with a trapped ultracold gas of Rubidium-87 atoms in two distinct regimes: with a one-dimensional thermal gas that can be considered non-interacting, and with a three-dimensional Bose-Einstein condensate for which interactions are dominant. In the first chapter, I recall some aspects of the theoretical description and important properties of such gases. The second chapter describes the Bose-Einstein condensation apparatus, mainly composed of two magneto-optical traps and a magnetic trap. In the third chapter, this setup is used to demonstrate that adiabatic processes — in our case, the slow decompression and displacement of the gas — can be dramatically accelerated by using a proper design of the time-dependent parameters of the system. The theoretical treatment is detailed and is not restricted to trapped gases. It may be applied to other physical systems described by either a linear or nonlinear Schrödinger equation containing a time-dependent harmonic potential. The final chapter is theoretical and not directly related to the others. In it I investigate the effect of disorder correlations on one-dimensional Anderson localization. I show that a degenerate mixture of Rubidium-87 and Potassium-41 atoms is well suited to study the localization-delocalization transition predicted by existing models of correlated disorder.

# Talks, Conferences & Posters

Refroidissement d'atomes par laser: des horloges atomiques aux ordinateurs quantiques en passant par les condensats de Bose-Einstein (seminar talk), Université de la Réunion, May 2023, Saint-Denis, La Réunion, France.

Controlling Bose-Einstein condensates with shortcuts to adiabaticity and optimal control theory (seminar talk), Observatoire de Paris, SYRTE, Jun. 2014, Paris, France.

EFTF 2014 - 28th European Frequency and Time Forum (attendant), Jun. 2014, Neuchâtel, Switzerland.

Shortcuts to adiabaticity for ultracold gases (invited talk), 22nd General Congress of the French Physical Society (SFP), Jul. 2013, Marseille, France.

Mach-Zehnder interferometer with squeezed spatial modes of Bose-Einstein condensates (talk), ICSSUR 2013, Jun. 2013, Nuremberg, Germany.

Integrated Mach-Zehnder interferometer for Bose-Einstein condensates (poster), ICOLS 2013, Jun. 2013, University of California, Berkeley, California, USA.

Mach-Zehnder interferometry with Bose-Einstein condensates (seminar talk), Instiut non linéaire de Nice, Oct. 2012, Valbonne, France.

Experiments on shortcuts and optimal control of Bose-Einstein condensates (invited talk), Workshop on Shortcuts to Adiabaticity, Jul. 2012, Bilbao, Spain.

Matter wave Mach-Zehnder interferometry on an atom chip (poster), QCMC 2012, Jul. 2012, Vienna, Austria.

Matter wave Mach-Zehnder interferometry on an atom chip (poster), SFB FoQuS meeting, Jul. 2012, Innsbruck, Austria.

Shortcuts to adiabaticity for trapped ultracold gases (invited talk), AQuA graduate student congress, CQT, Dec. 2010, Singapore.

Localization-delocalization transition in ultracold atomic mixtures (invited talk), PEPS Physique Théorique et ses interfaces, Meeting on quantum gases and condensed matter, Nov. 2009, Grenoble, France.

Fast optimal transition between two equilibrium states (poster), Theory of quantum gases and quantum coherence, Jun. 2010, Nice, France.

Localization-delocalization transition in the random-dimer model (poster), Theory of quantum gases and quantum coherence, Jun. 2010, Nice, France.

Localization-delocalization transition in a boson-boson mixture (poster), COLOQ’11, Sep. 2009, Mouans-Sartoux, France.

Transport properties of matter waves in the presence of correlated disorder (poster), YAO 2009, Fev. 2009, Vienna, Austria.

Transport properties of matter waves in the presence of correlated disorder (poster), Symposium for the 50 Years of Anderson Localization at Institut Henri Poincaré, Dec. 2008, Paris, France.

# Summer Schools

International School of Physics "Enrico Fermi", course CLXXXVIII on Atom Interferometry, Jul. 2013, Varenna, Italy.

CoQuS Summer School 2012, Quantum Physics meets Gravity, Sep. 2012, Vienna, Austria.

Les Houches School of Physics in Singapore, Ultracold Gases and Quantum Information, Jul. 2009, Singapore.