51 citations · 103 across the 16 of their papers we have counts for
15 papers · 1 filter
Input-Output Analysis of Quantum Dot SUPER Excitation
Johannes Kerber, Christoph Hotter, Helmut Ritsch +1
The Swing-UP of the quantum EmitteR population (SUPER) two-color pulsed excitation scheme allows for robust and close to 100\% excitation of a two-level quantum emitter using only…
Continuous Narrow-Linewidth Superradiance in Waveguide QED
Anna Bychek, Martin Fasser, Ivan Vybornyi +4
Superradiant lasers promise continuous, narrow-linewidth coherent emission at the bare atomic transition frequency, enabling frequency references of exceptional precision. Recent e…
Environment-Enhanced Single-Photon Absorption in a Nano-Ring of Dipole-Coupled Quantum Emitters
Eric Sánchez-Llorente, Helmut Ritsch, Maria Moreno-Cardoner
Decoherence is mostly detrimental in quantum information and quantum optics applications. However, the interplay between environment-induced incoherent dynamics and unitary evoluti…
Frequency shifts heralding ground state squeezing and entanglement of two coupled harmonic oscillators
Safoura Mirkhalaf, Helmut Ritsch, Karol Gietka
It is often argued that two linearly coupled quantum harmonic oscillators, even when cooled to their ground state, display no inherently quantum features beyond quantized energy le…
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…
Nanoscale Mirrorless Superradiant Lasing
Anna Bychek, Raphael Holzinger, Helmut Ritsch
We predict collective 'free-space' lasing in a dense nanoscopic emitter arrangement where dipole-dipole coupled atomic emitters synchronize their emission and exhibit lasing behavi…
Conditional Entanglement Amplification via Non-Hermitian Superradiant Dynamics
Christoph Hotter, Arkadiusz Kosior, Helmut Ritsch +1
Due to the inherently probabilistic nature of quantum mechanics, each experimental realization of a dynamical quantum system may yield a different measurement outcome, especially w…
Symmetry based efficient simulation of dissipative quantum many-body dynamics in subwavelength quantum emitter arrays
Raphael Holzinger, Oriol Rubies-Bigorda, Susanne F. Yelin +1
We propose an efficient method to numerically simulate the dissipative dynamics of large numbers of quantum emitters in ordered arrays in the presence of long-range dipole-dipole i…
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…
Collectively enhanced ground-state cooling in subwavelength atomic arrays
Oriol Rubies-Bigorda, Raphael Holzinger, Ana Asenjo-Garcia +6
Subwavelength atomic arrays feature strong light-induced dipole-dipole interactions, resulting in subradiant collective resonances characterized by narrowed linewidths. In this wor…
Harnessing quantum emitter rings for efficient energy transport and trapping
Raphael Holzinger, Jonah Peter, Stefan Ostermann +2
Efficient transport and harvesting of excitation energy under low light conditions is an important process in nature and quantum technologies alike. Here we formulate a quantum opt…
Scaling law for Kasha's rule in photoexcited molecular aggregates
Raphael Holzinger, Nico S. Bassler, Helmut Ritsch +1
We study the photophysics of molecular aggregates from a quantum optics perspective, with emphasis on deriving scaling laws for the fast non-radiative relaxation of collective elec…
Optimized geometries for future generation optical lattice clocks
Sebastian Krämer, Laurin Ostermann, Helmut Ritsch
Atoms deeply trapped in magic wavelength optical lattices provide a Doppler- and collision-free dense ensemble of quantum emitters ideal for high precision spectroscopy. Thus, they…