Category: Seminars

Monday May 19th we had the pleasure of having Justin Wells visiting our hub. He gave a very interesting presentation on his work within experimental condensed matter physics. It spent quite widely – ranging from implementing qubits in silicon to magnetic properties – and how they are related to ducklings. Despite this rather wide scope, those of us who attended go to hear a presentation which was both accessible and even entertaining.

If you want to learn more about Justin’s research activities, you can read more here:

Ny professor med kvantematerialer som spesiale

https://sites.google.com/site/quantumwells/home

Friday June 9th 2023 we had the pleasure of listening to Tanner Culpitt, postdoc at the Hylleraas Centre, giving a presentation entitled Electronic Structure and Molecular Dynamics in a Strong Magnetic Field. In addition to outlining how such systems can be studied non-perturbatively, he also shared ideas on how quantum computers may be useful in this context.

The seminar was part of a double MatMod seminar, in which also George Hitching from the Faculty of Education and International Studies at OsloMet presented a talk on Moduli of bundles over algebraic curves.

Full abstract for Tanners presentation:

The electronic structure and dynamics of molecules in magnetic fields have historically been treated perturbatively. A perturbative treatment is successful at weaker field strengths, such as those found on Earth. At higher field strengths such as those found in white dwarf stars or neutron stars, a perturbative treatment is inadequate, and new tools are needed to accurately model electronic structure and dynamics. This talk will focus on the theoretical development and application of these tools. Additionally, recent developments in the application of quantum algorithms for the calculation of molecular properties in a magnetic field will be discussed.

Friday 26^th of May Kishore Thapliyal, from Palacky University, Olomouc, Czecch Republic, will visit the Quantum Hub and tell us about his work on secure quantum computation.

Title and abstract:

Experimental generation of engineered multi-mode quantum states to use in secure quantum computation 

The idea of secure multiparty computation will be briefly reviewed. With the help of an example relevance of a quantum solution for such secure computation tasks in socioeconomic problems will be mentioned. Such relevant socioeconomic problems could be auction, voting, private comparison, etc. Quantum solutions for one such problem, anonymous veto, will be proposed with focus on the requirements of the desirable protocol. The solution uses multiparty densecoding which requires entanglement to be shared among the voters. A multiparty densecoding based protocol for quantum conference will also be discussed. Generation, transmission, and maintenance of such entangled states is a challenging task. In this context, some non-Gaussian operations are known useful for entanglement distillation. Here, we discuss photon subtraction on both signal and idler beams of a multi-mode twin beam generated experimentally. Joint photon-number distributions of photon-subtracted twin beams are monitored by an iCCD camera. The effect of photon subtraction on average photon numbers, nonclassical and non-Gaussian properties and entanglement of the generated states is studied considering the states obtained by subtracting up to four signal and idler photocounts.  

References 

[1] S. Mishra, K. Thapliyal, A. Parakh, and A. Pathak, Quantum anonymous veto: A set of new protocols, EPJ Quantum Technology 9, 14 (2022).  

[2] K. Thapliyal, J. Peřina Jr., V. Michalek, R. Machulka, and O. Haderka, Experimental characterization of photon-subtracted twin beams, Communicated (2023). 

It was our pleasure to invite you all to an interesting seminar by Simen Kvaal from University of Oslo. Simen is a quantum physicist with the Hylleraas centre at the Department of Chemistry, UiO. The title of his talk is “No need for a grid: Gaussians for the time-dependent Schrödinger equation”.

Read more about it here: https://arxiv.org/abs/2207.00271

We are pleased to invite you to listen to and talk with Stefanos Carlström from Lund University, who is going to present his work on Mathematical methods for high-dimensional physics; atoms and molecules in strong laser fields.

This invite goes out to the Dept. of Computer Science – and a few other colleges for whom this seminar could be of interest. Perhaps I have missed some;  do not hesitate to forward this invitation to anyone who might be interested.