David Wellnitz
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View article: Observation of generalized <i>t-J</i> spin dynamics with tunable dipolar interactions
Observation of generalized <i>t-J</i> spin dynamics with tunable dipolar interactions Open
Long-range and anisotropic dipolar interactions profoundly modify the dynamics of particles hopping in a periodic lattice potential. We report the realization of a generalized t-J model with dipolar interactions using a system of ultracold…
View article: Data for "Observation of Generalized t-J Spin Dynamics with Tunable Dipolar Interactions"
Data for "Observation of Generalized t-J Spin Dynamics with Tunable Dipolar Interactions" Open
Calculated dipole parameters, experimental and theoretical data and code needed to reproduce all plots of the paper, and separate csv files with data points of main figures.
View article: Sub-millisecond Entanglement and iSWAP Gate between Molecular Qubits
Sub-millisecond Entanglement and iSWAP Gate between Molecular Qubits Open
Quantum computation (QC) and simulation rely on long-lived qubits with controllable interactions. Early work in quantum computing made use of molecules because of their readily available intramolecular nuclear spin coupling and chemical sh…
View article: Relaxation in dipolar spin ladders: from pair production to false-vacuum decay
Relaxation in dipolar spin ladders: from pair production to false-vacuum decay Open
Ultracold dipolar particles pinned in optical lattices or tweezers provide an excellent platform for studying out-of-equilibrium quantum magnetism with dipole-mediated couplings. Starting with an initial state with spins of opposite orient…
View article: Observing dynamical phases of BCS superconductors in a cavity QED simulator
Observing dynamical phases of BCS superconductors in a cavity QED simulator Open
In conventional Bardeen-Cooper-Schrieffer (BCS) superconductors, electrons with opposite momenta bind into Cooper pairs due to an attractive interaction mediated by phonons in the material. While superconductivity naturally emerges at ther…
View article: Comparing bipartite entropy growth in open-system matrix-product simulation methods
Comparing bipartite entropy growth in open-system matrix-product simulation methods Open
The dynamics of one-dimensional quantum many-body systems is often numerically simulated with matrix-product states (MPSs). The computational complexity of MPS methods is known to be related to the growth of entropies of reduced density ma…
View article: Momentum-selective pair creation of spin excitations in dipolar bilayers
Momentum-selective pair creation of spin excitations in dipolar bilayers Open
We study the temporal growth and spatial propagation of quantum correlations in a two-dimensional bilayer realising a spin-1/2 quantum XXZ model with couplings mediated by long-range and anisotropic dipolar interactions. Starting with an i…
View article: Spin Squeezing with Itinerant Dipoles: A Case for Shallow Lattices
Spin Squeezing with Itinerant Dipoles: A Case for Shallow Lattices Open
Entangled spin squeezed states generated via dipolar interactions in lattice models provide unique opportunities for quantum enhanced sensing and are now within reach of current experiments. A critical question in this context is which par…
View article: Rise and Fall, and Slow Rise Again, of Operator Entanglement under Dephasing
Rise and Fall, and Slow Rise Again, of Operator Entanglement under Dephasing Open
The operator space entanglement entropy, or simply 'operator entanglement' (OE), is an indicator of the complexity of quantum operators and of their approximability by Matrix Product Operators (MPO). We study the OE of the density matrix o…
View article: The rise and fall, and slow rise again, of operator entanglement under dephasing
The rise and fall, and slow rise again, of operator entanglement under dephasing Open
The operator space entanglement entropy, or simply 'operator entanglement'\n(OE), is an indicator of the complexity of quantum operators and of their\napproximability by Matrix Product Operators (MPO). We study the OE of the\ndensity matri…
View article: Disorder enhanced vibrational entanglement and dynamics in polaritonic chemistry
Disorder enhanced vibrational entanglement and dynamics in polaritonic chemistry Open
Collectively coupling molecular ensembles to a cavity has been demonstrated to modify chemical reactions akin to catalysis. Theoretically understanding this experimental finding remains an important challenge. In particular the role of qua…
View article: Collective quantum dynamics of molecular ensembles coupled to a Cavity
Collective quantum dynamics of molecular ensembles coupled to a Cavity Open
This thesis aims to develop a deeper theoretical understanding of the collective, dissipative quantum dynamics of cavity-coupled molecular ensembles in three parts: First, a cavity is used in a novel scheme for dissipative formation of ult…
View article: A Network Approach to Atomic Spectra
A Network Approach to Atomic Spectra Open
Network science provides a universal framework for modeling complex systems, contrasting the reductionist approach generally adopted in physics. In a prototypical study, we utilize network models created from spectroscopic data of atoms to…
View article: Disorder enhanced vibrational entanglement and dynamics in polaritonic chemistry
Disorder enhanced vibrational entanglement and dynamics in polaritonic chemistry Open
Collectively coupling molecular ensembles to a cavity has been demonstrated to modify chemical reactions akin to catalysis. Theoretically understanding this experimental finding remains to be an important challenge. In particular the role …
View article: A quantum optics approach to photoinduced electron transfer in cavities
A quantum optics approach to photoinduced electron transfer in cavities Open
We study a simple model for photoinduced electron transfer reactions for the case of many donor-acceptor pairs that are collectively and homogeneously coupled to a photon mode of a cavity. We describe both coherent and dissipative collecti…