355 citations · 1.3k across the 12 of their papers we have counts for
13 papers
Serial Electron Diffraction Data Processing with diffractem and CrystFEL
Robert Bücker, Pascal Hogan-Lamarre, R. J. Dwayne Miller
Serial electron diffraction (SerialED) is an emerging technique, which applies the snapshot data-collection mode of serial X-ray crystallography to three-dimensional electron diffr…
Low-dose cryo electron ptychography via non-convex Bayesian optimization
Philipp Michael Pelz, Wen Xuan Qiu, Robert Bücker +2
Electron ptychography has seen a recent surge of interest for phase sensitive imaging at atomic or near-atomic resolution. However, applications are so far mainly limited to radiat…
Matter-wave recombiners for trapped Bose-Einstein condensates
Tarik Berrada, Sandrine van Frank, Robert Bücker +5
Interferometry with trapped atomic Bose-Einstein condensates (BECs) requires the development of techniques to recombine the two paths of the interferometer and map the accumulated…
Interferometry with non-classical motional states of a Bose-Einstein condensate
Sandrine van Frank, Antonio Negretti, Tarik Berrada +6
We demonstrate a two-pulse Ramsey-type interferometer for non-classical motional states of a Bose-Einstein condensate in an anharmonic trap. The control pulses used to manipulate t…
All-Optical Switch and Transistor Gated by One Stored Photon
Wenlan Chen, Kristin M. Beck, Robert Bücker +4
The realization of an all-optical transistor where one 'gate' photon controls a 'source' light beam, is a long-standing goal in optics. By stopping a light pulse in an atomic ensem…
Bogoliubov theory for atom scattering into separate regions
T. Wasak, P. Szankowski, R. Bücker +2
We review the Bogoliubov theory in the context of recent experiments, where atoms are scattered from a Bose-Einstein Condensate into two well-separated regions. We find the full dy…
Integrated Mach-Zehnder interferometer for Bose-Einstein condensates
Tarik Berrada, Sandrine van Frank, Robert Bücker +3
Particle-wave duality enables the construction of interferometers for matter waves, which complement optical interferometers in precision measurement devices. This requires the dev…
Vibrational state inversion of a Bose-Einstein condensate: optimal control and state tomography
Robert Bücker, Tarik Berrada, Sandrine van Frank +6
We present theoretical and experimental results on high-fidelity transfer of a trapped Bose-Einstein condensate into its first vibrationally excited eigenstate. The excitation is d…
Dynamics of parametric matter wave amplification
Robert Bücker, Ulrich Hohenester, Tarik Berrada +7
We develop a model for parametric amplification, based on a density matrix approach, which naturally accounts for the peculiarities arising for matter waves: significant depletion…
Hanbury Brown and Twiss correlations across the Bose-Einstein condensation threshold
Aurélien Perrin, Robert Bücker, Stephanie manz +5
Hanbury Brown and Twiss (HBT) correlations, i.e. correlations in far-field intensity fluctuations, yield fundamental information on the quantum statistics of light sources, as high…
Twin-atom beams
Robert Bücker, Julian Grond, Stephanie Manz +7
We present highly efficient emission of twin-atom beams into a single transversal mode of a waveguide potential. The source is a one-dimensional degenerate Bose gas in the first ra…
Two-point phase correlations of a one-dimensional bosonic Josephson junction
Thomas Betz, Stephanie Manz, Robert Bücker +8
We realize a one-dimensional Josephson junction using quantum degenerate Bose gases in a tunable double well potential on an atom chip. Matter wave interferometry gives direct acce…
Two-point density correlations of quasicondensates in free expansion
S. Manz, R. Bücker, T. Betz +8
We measure the two-point density correlation function of freely expanding quasicondensates in the weakly interacting quasi-one-dimensional (1D) regime. While initially suppressed i…