Mini-Symposium on Quantum Sciences

Contribution List

5. Voltage-controlled synthesis of higher harmonics and 4e supercurrent in hybrid Josephson junction circuits

Luca Banzerus

26/08/2024, 09:30

2. Quantum censorship---and how to get around it

Julian Pinske

26/08/2024, 10:10

We may soon see agencies offering public access to quantum communication networks. To prevent the unregulated spreading of quantum resources to malicious parties in their preparation of cryptographic attacks, governmental agencies might try to establish a quantum censorship. In such a protocol, quantum states which are deemed benign cross a network unaltered while hazardous quantum states are...

4. Quantum Quenches and Matrix Product States in AdS/CFT

Charlotte Kristjansen

26/08/2024, 11:10

I will explain how matrix product states are used to describe defects in the form of e.g. domain walls or monopoles in the AdS/CFT correspondence. Overlaps between the matrix product states and eigenstates of an integrable spin chain constitute correlation functions of the AdS/CFT system and can be computed exactly. The same overlaps contain information about the time development of the chain...

3. Mathematical methods for tensor networks

Freek Witteveen

26/08/2024, 11:50

Tensor networks provide succinct representations of quantum many-body states and are an important computational tool for strongly correlated quantum systems. In two or more spatial dimensions the mathematical theory of tensor networks is complicated. In this talk I will highlight some methods and mathematical techniques used in the study of tensors and algebraic geometry, which can be applied...

1. Photonics quantum computing: what we know and don't know

Stefano Paesani

26/08/2024, 13:30

6. Unconventional Superconductivity in Quantum Materials

Morten Holm Christensen

26/08/2024, 14:10

I will review the concepts of conventional and unconventional superconductivity in quantum materials and explain how this is related to the electronic interactions – or correlations – present in the system. While conventional superconductivity typically emerges in weakly correlated systems, unconventional superconductivity appears in moderately and strongly correlated systems, and continues to...

7. Combining Spin Qubits and Superconductivity in Quantum Computers

William Lawrie

27/08/2024, 09:30

In this talk, I argue that utilizing hybrid approaches to quantum computing – that is - combining different qubit implementations into a single platform – could be highly beneficial to building large scale quantum information processors. After a refresher on quantum computation, I review the multitude of hybrid approaches to quantum computing and their place at the Niels Bohr institute, and...

8. Multi-scale Modelling of Quantum Devices and Experiments with Spins

Benjamin Joecker

27/08/2024, 10:10

Semiconductor quantum devices that allow to confine and manipulate single spins as well as control the interactions between them, are a natural system to explore fundamental quantum phenomena or host qubits in tomorrow’s quantum computers. Understanding and designing experiments on such chips, requires modelling both at the device and the microscopic scale. Here, I will give an overview of...

9. Harnessing fundamental interactions between light and atoms

Jean-Baptiste Beguin

27/08/2024, 11:10

There is a growing research community that attempts to create new paradigms for the strong coupling of light and matter by way of individual atoms interacting with photons in nano-scale dielectric lattices.

Combining the exquisite level of control of atomic systems, their non-linearity, and quantum functionality with the guiding and trapping of light in linear nano-dielectric waveguides...

10. Evading Quantum Noise in Macroscopic Systems

Emil Zeuthen

27/08/2024, 11:50

Any sensing device will – if it is sufficiently perfected with regard to reducing technical noise – eventually face the obstacle of quantum noise, which can be seen as a ubiquitous consequence of Heisenberg's Uncertainty Principle. Today, a surprising variety of systems have reached this quantum-limited regime, prompting the question of how to improve the sensitivity further. Here, I will...

11. What a Quantum Computer does when it does nothing

Svend Krøjer Møller

27/08/2024, 13:30

I will give an overview of the key scientific discoveries leading to the current race towards building a fault-tolerant quantum computer. We will focus on the superconducting qubit platform and I will put our groups research efforts into this context. As an example, I will introduce one of our research interests: the “Lindbladian learning problem”, which essentially tries to answer the...

12. Unveiling order from chaos by approximate 2-localization of random matrices

Nicolas Loizeau

27/08/2024, 14:10

Quantum many-body systems are typically endowed with a tensor product structure.A structure they inherited from probability theory, where the probability of two independent events is the product of the probabilities. The tensor product structure of a Hamiltonian thus gives a natural decomposition of the system into independent smaller subsystems. It is interesting to understand whether a given...