From quantum transitions to electronic motions (Mandy Singh, MPI Quantum Optics, Garching, Germany).-
Nonadiabatic molecular alignment of linear molecules probed by photoelectron ionization yields (Hans Schüssler, Texas A&M Univ, USA).-
Ultracold metastable helium: Ramsey fringes and atom interferometry (Wim Vassen, Vrije Universiteit, Amsterdam, Netherlands).-
Monolayer graphene as dissipative membrane in an optical resonator (Michael Köhl, Univ Cambridge, UK / Univ Bonn, Germany).-
Cavity ring-up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator (Síle Nic Chormaic, Okinawa Univ, Japan).-
Quantum electrodynamics, high-resolution spectroscopy, and fundamental constants (Savely G. Karshenboim, Mendeleev Institute for Metrology, Russia).-
Yb fiber amplifier at 972.5 nm with frequency quadrupling to 243.1 nm (Cory Rasor, Colorado Univ, USA).-
Absorption spectroscopy of xenon and ethylene-noble gas mixtures at high pressure: Towards Bose-Einstein condensation of vacuum ultraviolet photons (Christian Wahl, Univ Bonn, Germany).-
Ranging with frequency-shifted feedback lasers: from $\mu$m-range accuracy to MHz-range measurement rate (Leonid Yatsenko, Nat. Acad. Sc. Ukraine / Kiew Univ, Ukraine).-
Laser phase spectroscopy in closed-loop multilevel schemes (Ennio Arimondo, Univ Pisa, Italy).- Sensitivity and resolution in frequency comb spectroscopy of buffer gas cooled polyatomic molecules (Bryan Changala, Nat. Inst. of Standards (NIST) / Colorado Univ, USA).-
Precision measurements and test of molecular theory in highly-excited vibrational states of H_2 _(v=11) (Edcel Salumbides, Vrije Universiteit, Amsterdam, Netherlands).-
Quantum regime of a free-electron laser: relativistic approach (Peter Kling, Helmholtz-Center, Dresden, Germany).-
Coherence in laser-driven electrons at and in solid matter (Peter Hommelhoff, Univ Erlangen, Germany).-
Unexpectedly large difference of the electron density at the nucleus in the 4p 2P1/2,3/2 fine-structure doublet of Ca+ (Piet O. Schmidt, Inst. Experiment. Quantum Metrology, PTB, Braunschweig, Germany).-
A 10^15 watt laser for DT Fusion Experiments at Livermore (John F. Holzrichter, Lawrence Livermore Nat Lab / Stanford Univ, USA).-

Extraction of enhanced, ultrashort laser pulses from a passive 10-MHz stack-and-dump cavity (Sven Breitkopf, Univ Jena, Germany).-
Adjacency Graphs and Long-Range Interactions of Atoms in Quasi-Degenerate States: Applied Graph Theory (Ulrich Jentschura, Missouri Univ, USA).-
External Cavity Diode Laser Setup with Two Interference Filters (Patrick Baus. Univ Darmstadt, Germany).-
Phase-stable, multi-µJ femtosecond pulses from a repetition-rate tuneable Ti: Sa-oscillator-seeded Yb-fiber amplifier (Tobias Saule, Munich Univ (LMU), Germany).-
High-precision spectroscopy of the HD+ molecule at the 1-p.p.b. level (Jeroen Koelemeij, Vrije Universiteit, Amsterdam, Netherlands).-
Bose-Einstein condensates in an optical cavity with sub-recoil bandwidth (Andreas Hemmerich, Univ Hamburg, Germany).-
Ultrafast optomechanical pulse picking (Nikolai Lilienfein, Munich Univ (LMU), Germany).-
About the Author:

Prof. Dr. Tilman Esslinger

Head of the Quantum Optics Group, ETH Zürich, Switzerland

Research area: Quantum gases, quantum simulation, quantum optics

Major scientific accomplishments: first experimental realization of a Fermi-Hubbard model and the Mott insulator using a fermionic quantum gas trapped in an optical lattice, measurement of the critical exponent of the correlation length in a Bose gas, first realization of a one-dimensional atomic quantum gas, cavity QED and cavity opto-mechanics with Bose- Einstein condensates, observation of the Dicke quantum phase transition, optical lattices with Dirac points, realization of the topological Haldane model, observation of quantized conductance in a Fermi gas.

Prof. Dr. Dieter Meschede

Head of Quantum Technology group at University Bonn, Germany

Editor-in-Chief of the journal Applied Physics B - Lasers and Optics,

Research interests: Quantum technologies with single neutral atoms, few-atom quantum systems, discrete-time quantum walks, cavity QED, digital quantum simulators

Prof. Dr. Thomas Udem

Permanent research associate at the Laser spectroscopy division / Max Planck Institute of Quantum Optics / Garching and Institute of Physics Ludwig Maximilian University, Munich, Germany.

Research interests: Ultraprecise laser spectroscopy, Frequency combs in the extreme ultraviolet, High harmonic generation, Atomic physics with ion traps, Precision spectroscopy of single atoms, hydrogen and hoydrogen-like systems, Test of fundamental laws, Search for slowly varying constants, Frequency combs infrared and extreme ultraviolet, Ion traps, Intra-cavity high harmonic generation