211 citations · 735 across the 20 of their papers we have counts for
21 papers
The Cumulant Expansion Approach: The Good, The Bad and The Ugly
Johannes Kerber, Helmut Ritsch, Laurin Ostermann
The configuration space, i.e. the Hilbert space, of compound quantum systems grows exponentially with the number of its subsystems: its dimensionality is given by the product of th…
Selective Preparation of Collective States in Coupled Quantum Emitters Using the SUPER Excitation Scheme
Johannes Kerber, Laurin Ostermann, Vikas Remesh +2
The efficient preparation of collective eigenstates of subwavelength-spaced optical dipoles is a prerequisite for observing their signature radiative properties and for their appli…
Self-ordering, cooling, and lasing in an ensemble of clock atoms
Anna Bychek, Laurin Ostermann, Helmut Ritsch
Active atomic clocks are predicted to provide far better short-term stability and robustness against thermal fluctuations than typical feedback-based optical atomic clocks. However…
Subradiance and Superradiant Long Range Excitation Transport among Quantum Emitter Ensembles in a Waveguide
Martin Fasser, Laurin Ostermann, Helmut Ritsch +1
In contrast to free space, in waveguides the dispersive and dissipative dipole-dipole interactions among quantum emitters exhibit a periodic behavior over remarkably long distances…
Temperature-Enhanced Critical Quantum Metrology
Laurin Ostermann, Karol Gietka
We show that the performance of critical quantum metrology protocols, counter-intuitively, can be enhanced by finite temperature. We consider a toy-model squeezing Hamiltonian, the…
Cavity Sub- and Superradiance Enhanced Ramsey Spectroscopy
Christoph Hotter, Laurin Ostermann, Helmut Ritsch
Ramsey spectroscopy in large, dense ensembles of ultra-cold atoms trapped in optical lattices suffers from dipole-dipole interaction induced shifts and collective superradiance lim…