Author: Vebjørn H. Bakkestuen

It is a pleasure to invite you all to a MatMod / QHub / REGAL seminar by Mathias Oster from the Department of Mathematics at RWTH Aachen University.

Score based learning in scientific computing

Abstract:  Generative modeling and, in particular, score based learning are popular methods of generation of new samples based on given samples such that the distribution is approximatively the same. I will present the basic ideas of score-based learning and its particularities when applied in scientific computing.

Time and Location

Tuesday May 20th, 13:00 – 14:00
Ellen Gleditschs hus (P35), room PI649

It is a pleasure to invite you all to a MatMod / QHub / REGAL seminar by Marco Matassa from the Department of Computer Science at Oslo Metropolitan University.

Actions on tensor products and Kashiwara’s crystals

Abstract:  I will give a simple overview, based on examples, of how various algebraic structures act on tensor products. After looking at the familiar examples of Lie groups and Lie algebras, I will discuss the example of the quantized enveloping algebra of sl₂ This serves as a motivation to introduce the idea of Kashiwara’s crystals, and see them in action (no pun intended) in simple examples. I will discuss how this gives a new perspective on the old problem of decomposing a tensor product into irreducible components.

Time and Location

Wednesday April 23rd, 13:00 – 14:00
Ellen Gleditschs hus (P35), room PI749

It is a pleasure to invite you all to a MatMod / QHub / REGAL seminar by Marianne Bathen and Lasse Vines from the Department of Physics at the University of Oslo.

Quantum Technology (QT) studies at UiO
and teaching QT to 2^nd year bachelor students

Abstract: In 2024, the University of Oslo started a new study direction within the Physics & Astronomy BSc programme on Quantum Technology (QT). The study direction aims at giving a broad overview of the topic, ranging from fundamental quantum physics and the quantum mechanics needed to utilize QT within the different applications, via physical realizations to quantum computing and quantum information science. The programme should prepare the students for various master programmes within QT, both at UiO and elsewhere.

The first QT related course in the study direction is found in the third semester, and titled “Fys1400 Introduction to quantum technology”. The course is given before the regular quantum physics course, and aims at giving a broad overview of the topic before the student dive into the various aspects of quantum physics and QT.

In this talk we will give a brief overview of the ongoing changes in the educational programmes at the Department of Physics at UiO, and give a brief overview and thoughts on teaching the introductory course in QT.

Time and Location

Wednesday March 26th, 14:00 – 15:00
Ellen Gleditschs hus (P35), room PS439

It is a pleasure to invite you all to a MatMod / QHub / REGAL seminar by PhD candidate Kristian Wold from OsloMet – Oslo Metropolitan University.

Experimental Dissipative Quantum Chaos

Abstract: Classically chaotic systems are those where trajectories diverge exponentially as initial conditions are varied. However, it is not obvious how this can emerge from the more fundamental quantum mechanics, a linear theory. To see the connection, new mathematical tools for “Quantum Chaos” was developed, among them Random Matrix Theory (RMT) for studying quantum systems at the spectral level. Since its birth, RMT has been used to characterize signatures of chaos for closed quantum systems, both for theoretical models and physically realized experiments, showing good correspondence. 

More recently, RMT is being expanded to also treat dissipative quantum systems, inventing tools for detecting chaotic and integrable (non-chaotic) signatures for quantum systems influenced by noise from an environment. However, experimental insights have lagged behind. We substantiate the field of Experimental Dissipative Quantum Chaos by utilizing noisy intermediate-scale quantum (NISQ) computers as a tunable testbed for detecting dissipative quantum chaos. To do this, we have invented a gradient-based quantum tomography protocol, letting us model NISQ circuits as quantum channels from measurement data.

We find that parameterized quantum circuits produce spectra whose support closely follow that of the Diluted Unitary model, a two-parameter stochastic model. Further, we device a type of circuit that lets us engineer artificial noise predicted by RMT to exhibit integrability. We find that we have sufficient experimental fidelity and sensitivity to detect said integrability when implemented on hardware, showing that it is a suitable testbed for similar investigations. Lastly, we find that, when you run the circuit for sufficient depth, there is a transition between integrability and chaos, showing that the intrinsic noise of the hardware has a chaotic nature.

Time and Location

Wednesday March 12th, 13:00 – 14:00
Ellen Gleditschs hus (P35), room PS439