Author: Finn Holler

Schrodinger’s cat qubits are a promising candidate for bosonic error correction and have been the subject of extensive theoretical and experimental investigation. We introduce a new paradigm to stabilize cat-like states using interfering gain and loss processes with different nonlinear dependence on the energy of the oscillator. Where these competing processes are equal in strength,…

Cold molecules are now at the forefront of research, allowing to explore cold chemistry, astrophysics, quantum computing and even fundamental physics. Extensions of methods used to cool atoms are now being applied to more and more complex molecules. Reaching cold temperatures (< 10 K) allows for example the study of quantum effects in chemical reactions.I…

A single spin, as found in the nitrogen-vacancy (NV) center, is a purely quantum system, whereas our 1×1 mm membranes behave like classical resonators, vibrating similarly to trampolines. Our aim is to bridge these two systems by investigating the spin-mechanical coupling between the magnetic states of a single NV center and the motion of a…

Neutral atoms are nature’s perfect qubits: they are all identical, and our precise knowledge of their properties allows us to control them at will. Cooling and trapping many atoms offers the unique opportunity to experimentally address outstanding problems in many-body quantum physics. Quantum gas microscopy brings this effort to the ultimate level of single particle…

High-accuracy quantum chemical calculations are commonly limited to relatively small molecules due to the exponential scaling of the computational cost with the number of involved particles. By leveraging powerful tensor decomposition-based approaches, tensor network algorithms are continuously expanding the scope of wave function-based molecular simulation methods. While tensor network-based methods such as the density matrix…

The field of Quantum Key Distribution (QKD) has attracted a lot of attention as one of the quantum technologies that not only addresses one of the most pressing problems in secret communication, but has also shown promising progress on the implementation side. A major advantage of QKD protocols is their provable security. This talk will…

Levitation in vacuum has evolved into a versatile technique which has already benefited diverse scientific directions, from force sensing and thermodynamics to material science and chemistry. It also holds great promises of advancing the study of quantum mechanics in the unexplored macroscopic regime. While most current levitation platforms are complex and bulky, miniaturization is sought…

When you want to trap neutral atoms in optical tweezers you better be cold. And when I say cold I don’t mean dilution fridge cold. I mean 10 times colder. To reach such temperatures we conventionally use laser cooling, which brings us to the doppler temperature proportional to the transition linewidth. But what if the…

Bilayer graphene (BLG) has emerged as a promising platform for hosting qubits within 2D materials. By encapsulating it in a dielectric and applying gating techniques, one can electrostatically confine individual charge carriers, both electrons and holes, and thus obtain what is called a quantum dot (QD). Charge detection schemes allow us study the quantum properties…

Quantum computers can provide asymptotically faster computation times than their classical counterparts in specific applications. However, to outperform the classical computers we have today, we need large-scale, fault-tolerant devices. Quantum error correction (QEC) is considered one of the most promising ways of achieving this milestone. However, much work is still needed to improve both the…