Seminar: Bathen & Vines

Vebjørn H. Bakkestuen on 22. March 2025

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 2nd 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

Seminar: Kristian Wold

Vebjørn H. Bakkestuen on 7. March 2025

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

Seminar: Fabian Faulstich

Vebjørn H. Bakkestuen on 28. November 2024

It is a pleasure to invite you all to a lecture by Assistant Professor Fabian Faulstich from the Rensselaer Polytechnic Institute (RPI) in New York. The lecture will be given as a part of the Workshop on Quantum Theory: Foundations and Extensions of Density-Functional Theory held the same week.

A practical guide to quantum linear algebra

Abstract: We provide an introductory and practical guide to quantum phase estimation algorithms. We begin with a concise overview of the principles of qubits, focusing on state visualization, measurement intricacies, and their relationship to the classical eigenvalue problem. We introduce the Hadamard test and quantum phase estimation (QPE) as methods for eigenvalue approximation. For both algorithms, we detail their mathematical foundations, implementation steps, and error analyses, demonstrating how precision improves with increased measurements or ancilla qubits. Example simulations are performed using hardware emulators and the IBM Eagle One quantum machine, comparing the two approaches. Finally, we highlight the practical significance of QPE by applying it to the Transverse Field Ising Model, illustrating its utility in quantum physical systems.

The IBM Quantum System One at Rensselaer Polytechnic Institute, unveiled on April 5, 2024. Credit: IBM

About

Fabian has a background in mathematics, physics, and theoretical chemistry with a focus on problems arising from quantum many-body physics. In 2020, he earned his PhD in Applied Mathematics and Theoretical Chemistry from the University of Oslo. Currently, he servers as an Assistant Professor of Mathematics at RPI, where he also holds the Eliza Ricketts Foundation Career Development Chair.

His research focuses on advancing knowledge and methods for quantum many-body problems. His research involves the development, implementation, and mathematical analysis of cutting-edge numerical methods on classical as well as quantum machines.

Time and location

Wednesday December 4th, 11:00 – 12:00
Ellen Gleditschs hus (P35), auditorium PI646

On behalf of the organisers,
Vebjørn H. Bakkestuen
vebjorn.bakkestuen@oslomet.no

Participants Workshop on Quantum Theory: Foundations and Extensions of Density-Functional Theory

Vebjørn H. Bakkestuen on 19. August 2024

Confirmed Participants

The list of confirmed participants will be continuously updated.
For any questions regarding the workshop, please see the webpage or contact the organisers.

The organisers

Vebjørn H. Bakkestuen
Email: vebjorn.bakkestuen@oslomet.no

Andre Laestadius
Email: andre.laestadius@oslomet.no