From the 1 of 14 linked papers with an AI index.
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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 Cumulants 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…
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…
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…
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…
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…