Institut for Matematik og Datalogi

FNUG forskningsseminar om at engagere unge ph.d.-forskere i aktiv deltagelse i forskningsfællesskabet inden for STEM-uddannelse

Speaker: Frederik Nathan (University of Copenhagen).Abstract: The current main paradigm for quantum computing — active quantum error correction (AEC) with overhead qubits — faces two challenges: Realizing long-lived logical qubits at reasonable resource cost, and achieving universal fault-tolerant quantum gates. At the root of these challenges lie two no-go theorems: The Braviy-Terhal theorems, which forbids passively-stabilized, or self-correcting, qubits in <4 dimensions, and the Eastin-Knill theorem which dictates that fault-tolerant non-Clifford gates must be generated with costly magic distillation or cultivation routines. Together, these theorems imply that even simple quantum information processing operations require continuous readout, data processing, and feedback control of very large numbers of overhead qubits. Here I illustrate how the no-go-theorems above are not as far-reaching as one could fear, but can be circumvented via an alternative paradigm for quantum computing currently gaining experimental maturity: bosonic codes (BC), which redundantly encodes a qubit in the infinite-dimensional Fock state of a single continuous variable. In particular, I will demonstrate how tuning the impedance of a simple driven-dissipative superconducting resonator to a “magic” value given by a constant of nature can lead to a self-correcting Gottesman-Kitaev-Preskill qubit that supports exponentially-robust Clifford and non-Clifford gates [1,2]. [1] FN, L. O’Brien, K. Noh, M.H. Matheny, A.L. Grimsmo, L. Jiang, G. RefaelPRX Quantum 6 (3), 030352 (2025)[2] L. O'Brien, G. Refael, FN arXiv:2507.19713 (2025)

How do universities build a strong ERC (European Research Culture) culture - and why is it important?

Speaker: Ralph Kaufmann (Purdue University).Abstract: Quantum phase transitions are a key part of the quantum landscape. These appear in mathematical systems and real materials. They are potentially useful for quantum computing and quantum sensing. In joint work with Mohamad Mousa and Birgit Kaufmann-Wehefritz, we showed that any abstract phase diagram of Chern insulators can be achieved in a continuum model. Furthermore, we gave sequences of higher Chern models built on tight-binding models exhibiting an infinite sequence of Chern numbers. In newer developments these constructions also will shed light on MPS and materials with symmetries. We also conjecture that they will be useful for quantum error correction.

Speaker: Birgit Kaufmann (Purdue University).Abstract: Quantum annealers represent an interesting approach to quantum computing, which make use of the adiabatic theorem to efficiently find the ground state of a physically realizable Hamiltonian. Such devices are currently commercially available and have been most successfully applied to several combinatorial and discrete optimization problems. However, the application of quantum annealers to problems in chemistry remains a relatively sparse area of research due to the difficulty in mapping molecular systems to the Ising Hamiltonian representing the architecture of the DWave quantum computer. In this talk, we review two different methods for finding the ground state of molecular Hamiltonians using Ising-model-based quantum annealers. In addition, we compare the relative effectiveness of each method by calculating the binding energies, bond lengths, and bond angles of the H3+ and H2O molecules and mapping their potential energy curves. We also assess the resource requirements of each method by determining the number of qubits and computation time required to simulate each molecule using various parameter values. While each of these methods is capable of accurately predicting the ground state properties of small molecules, we find that they are still outperformed by modern classical algorithms and that the scaling of the resource requirements remains a challenge.

Arrangementet afholdes på engelsk. Klik her for at læse en beskrivelse af arrangementet.

Speaker: Boris Kjær (​University of Copenhagen)Abstract:TBA

Maiken Westen Holm Svendsen forsvarer sin ph.d.-afhandling ved et offentligt foredrag: “Mod en mere sammenhængende evalueringskultur i matematikfaget på HTX – STEM-forløb mellem læring, kompetence”.Lektor Gitte Miller Balslev vil være ordstyrer ved arrangementet. Ph.d.-forsvaret finder sted i IMADA Konferencelokale (Ø18-509-2).Alle er velkomne.

Kageklubben er et nyt og hyggeligt initiativ, der samles fire gange hvert semester med gratis kaffe, kage og godt fællesskab.Så uanset om du studerer AI, Anvendt Matematik, Datalogi, Matematik eller Matematik-Økonomi, er du inviteret.Huske at tage dine studiekammerater med (undervisere er også velkomne).Klubmøderne holdes på IMADA Forskertorv.Læs evt. mere på Facebook-gruppen IMADA-students.

Speaker: Sara Maggio (​University of Bonn)Abstract: TBA

Kageklubben er et nyt og hyggeligt initiativ, der samles fire gange hvert semester med gratis kaffe, kage og godt fællesskab.Så uanset om du studerer AI, Anvendt Matematik, Datalogi, Matematik eller Matematik-Økonomi, er du inviteret.Huske at tage dine studiekammerater med (undervisere er også velkomne).Klubmøderne holdes på IMADA Forskertorv.Læs evt. mere på Facebook-gruppen IMADA-students.

In this event we will look at how teaching can help spark students’ individual learning awareness and build engagement to help foster a strong learning community between our students.

In this event we will look at how teaching can help spark students’ individual learning awareness and build engagement to help foster a strong learning community between our students.

Kageklubben er et nyt og hyggeligt initiativ, der samles fire gange hvert semester med gratis kaffe, kage og godt fællesskab.Så uanset om du studerer AI, Anvendt Matematik, Datalogi, Matematik eller Matematik-Økonomi, er du inviteret.Huske at tage dine studiekammerater med (undervisere er også velkomne).Klubmøderne holdes på IMADA Forskertorv.Læs evt. mere på Facebook-gruppen IMADA-students.

Kageklubben er et nyt og hyggeligt initiativ, der samles fire gange hvert semester med gratis kaffe, kage og godt fællesskab.Så uanset om du studerer AI, Anvendt Matematik, Datalogi, Matematik eller Matematik-Økonomi, er du inviteret.Huske at tage dine studiekammerater med (undervisere er også velkomne).Klubmøderne holdes på IMADA Forskertorv.Læs evt. mere på Facebook-gruppen IMADA-students.

FNUG og NAFA inviterer til NiSE-webinar