People


Quinten Mortier

Quinten Mortier

Phd Student
quinten.mortier@ugent.be

office: 120 032

Tel: +32 – (0)9 – 264 45 19

 

Research interests: 

Hamiltonian renormalization group for extended quantum systems
Continuous tensor networks (especially cMERA)
(Gaussian) fermionic PEPS
Markus Hauru

Markus Hauru

Postdoc
markus.hauru@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 76

 

Research Interests: 

I work on tensor network methods for many-body physics, especially in relation to real-space renormalization group transformations and decoherence.

Tom Vieijra

Tom Vieijra

Phd Student
tom.vieijra@ugent.be

office: 120 032

Tel: +32 – (0)9 – 264 45 19

 

Research Interests: 

– Machine learning inspired methods for strongly correlated (quantum and classical) many body systems
– Physics inspired techniques in machine learning
– Phase transitions in many body physics
Jacopo de Nardis

Jacopo de Nardis

Postdoc
jacopo.denardis@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 48 38

 

Research interests: 

—  Out-of-equilibrium quantum dynamics in spin chains and Bose gases (Generalised Gibbs ensembles, Generalised Hydrodynamics)
— Correlation functions in strongly correlated quantum systems in 1d (Bethe Ansatz, Algebraic Bethe Ansatz, form factors, Bootstrap method)
— Stochastic models out of equilibrium (Stochastic growth of interfaces, KPZ equation, vertex models)
Andrew Hallam

Andrew Hallam

Postdoc

andrew.hallam@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 71

 

Research Interests: 

The application of tensor networks to path integrals.
Out-of-equilibrium dynamics and thermalization in quantum spin chains.
The interplay between tensor networks and machine learning.
Laurens Lootens

Laurens Lootens

Phd Student

laurens.lootens@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 76

 

Research Interests: 

Topological order with tensor networks
2D stat mech models at criticality with strange correlators
(Non-) unitary fusion categories and their relation to (logarithmic) conformal field theories

Gert Vercleyen

Phd Student
gert.vercleyen@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 76

 

Research Interests: 

My research interests lie on the interface between mathematics and
physics. At the moment I am working on the following topics:

  • Integrability
  • Quantum Groups
  • Hopf Algebras and the Bethe ansatz and
    the role tensor networks play in these subjects
  • The interplay between tensor networks and category theory
Matthias Bal

Matthias Bal

PhD student

matthias.bal@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 76

 

Research interests:

Tensor networks and real-space renormalization

Laurens Vanderstraeten

Laurens Vanderstraeten

Postdoc

laurens.vanderstraeten@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 48 38

 

Research interests:

Matrix product states and tangent-space methods
Low-energy dynamics of quantum spin chains
Projected entangled-pair states: ground states and excitations

Karel Van Acoleyen

Karel Van Acoleyen

Postdoc

karel.vanacoleyen@ugent.be

office:  120 005

Tel: +32 – (0)9 – 264 47 62

 

Teaching:

Theory of relativity
Theory of relativity and classical fields

Jutho Haegeman

Jutho Haegeman

Professor

jutho.haegeman@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 71

 

Research:

I am interested in strongly correlated quantum many body systems and exotic phenomena in quantum condensed matter physics. My research focusses on studying these systems using the formalism of tensor networks, which offer a faithful description of low-energy quantum many body states, as motivated by the area law scaling of entanglement entropy. On the one hand, tensor network states enable accurate ab-initio simulations of the low-energy properties of strongly interacting Hamiltonians, while on the other they allow us to tackle general questions from the wave function point of view, irrespective of the details of any Hamiltonian or Lagrangian. Tensor network states also provide an interesting new perspective to holography and quantum gravity.

Google Scholar — arXiv — PhD thesis — Github

Teaching:

I am currently teaching a course in Electromagnetism (2nd Bachelor Physics and Astronomy, UGent)

Personal:

Hiking and photography

Robijn Vanhove

Robijn Vanhove

PhD student

robijn.vanhove@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 76

 

Research interests:

Tensor network theory for topological order
Symmetry protected topological order phase detection with tensor networks
Anomalies in condensed matter systems
Numerical simulation with projected entangled pair states

Benoît Tuybens

Benoît Tuybens

PhD student

benoit.tuybens@ugent.be

office:  120.032

Tel:  +32 – (0)9 – 264 45 19

 

Research interests:

Entanglement for gauge theories (and QFTs)
Continous tensor network states (cMPS and cMERA) for QFTs
Quenches (real time evolution) in QFTs (for example Schwinger model) using time-dependent cMPS ansatz

Nele Callebaut

Nele Callebaut

FWO postdoc

nele_callebaut@hotmail.com

office: 120 033
Tel: +32 – (0)9 – 264 96 58

 

Research interests:

AdS/CFT   In particular lately: AdS3/CFT2, relation to tensor networks, kinematic space, etc
Entanglement in holography

Volkher Scholz

Volkher Scholz

Postdoc - former member of our research group at Ghent University

volkher.scholz@gmail.com

 

Research interests:

My research area is quantum information science, an interdisciplinary field at the interface of physics, mathematics and computer science. I focus on establishing links between theoretical physics, mathematics — especially functional analysis and infinite dimensional algebra — and theoretical computer science in order to gain new insights into the nature of quantum mechanical systems. Apart from scientific curiosity, one of my prime motivations is to propose new techniques for information processing.

My multidisciplinary contributions range from areas within theoretical physics such as quantum field theories or transport properties of lattice systems to topics within theoretical computer science such as quantum cryptography or non-commutative optimization as well as to mathematical questions related to the theory of operator algebras and operator spaces.

In my current research, I focus on improving our understanding of quantum systems with infinitely many degrees of freedom. Examples of such systems are quantum field theories or more generally quantum systems which are described by infinite-dimensional Hilbert spaces, like photonic systems.

Jos Vandoorsselaere

Jos Vandoorsselaere

Postdoc - former member of our research group at Ghent University

jvdoorss@gmail.com

 

Research interests:

Magnetic field induced effects in gauge and condensed matter theories

Bram Vanhecke

Bram Vanhecke

PhD student

bavhecke.vanhecke@ugent.be

office:  120 005

Tel:  +32 – (0)9 – 264 49 76

 

Research interests:

I study classical lattice and quantum gauge theory, making use of various tensor network techniques.

Alexis Schotte

Alexis Schotte

Phd student

alexis.schotte@ugent.be

bureau:  120 005

Tel:  +32  – (0)9 – 264 49 76

 

Research interests:

Anyons and topological order

Topological quantum computing and error correcting codes

Frank Verstraete

Frank Verstraete

Professor

frank.verstraete@ugent.be

office: 120 006

Tel:  +32 – (0)9 – 264 48 02

 

research interests:

Quantum Information Theory and the Theory of Entanglement
Strongly Correlated Quantum Systems and their Numerical Simulation
Linear and Multilinear Algebra

Klaas Gunst

Klaas Gunst

PhD student

klaas.gunst@ugent.be

office:  120 005

Tel:  +32  – (0)9 – 264 49 76

 

Research interests:

The application of tensor networks on quantum chemical systems

Stijn De Baerdemacker

Stijn De Baerdemacker

Postdoc

stijn.debaerdemacker@ugent.be

office: 120.005

Tel: +32 – (0)9 – 264 48 38

 

Research interests 

(Quantum) many-body systems, large & small

Our world is experiencing a paradigm shift due to ever larger High Performance Computing (HPC) facilities and a growing lake of numerical & experimental data. Nevertheless, despite growing computational recourses, some many-body systems persist to elude us. Think about the high-Tc superconductors, or large complex (bio)-molecules involving multiple transition-metal agents. These systems are typically characterized by a large degree of quantum correlations which cannot be captured with conventional approaches. It is clear that we are missing crucial ingredients at the fundamental quantum level. My research is to find these crucial ingredients, and build computationally efficient quantum many-body theories around it.

Currently, a major theme in my research is to go “beyond integrability”. Conventional quantum many-body methods start from uncorrelated quantum states upon which quantum correlations are subsequently built in. However more symmetric than their non-integrable counterparts, integrable systems often have these strong quantum correlations naturally built in. Thanks to many theorems in integrability (Gaudin, Slavnov, Borchardt, …) it is possible to go one step beyond uncorrelated basis’ and use the

I have given a series of lectures at CEA Saclay of which my lecture notes can be found on http://users.ugent.be/~sdbaerde/saclaylectures.html

Recent papers on this subject can be found here:

A new mean-field method suitable for strongly correlated electrons: computationally facile antisymmetric products of nonorthogonal geminals
Peter Limacher, Paul Ayers, Paul Johnson, Stijn De Baerdemacker, Dimitri Van Neck, Patrick Bultinck
Journal of Chemical Theory and Computation 9, 1394 (2013)
[doi:10.1021/ct300902c]

Efficient description of strongly correlated electrons with mean-field cost
Katharina Boguslawski, Pavel Tecmer, Paul Ayers, Patrick Bultinck, Stijn De Baerdemacker, Dimitri Van Neck
Physical Review B89, 201106 (2014)
[doi:10.1103/PhysRevB.89.201106]

A variational method for integrability-breaking Richardson-Gaudin models
Pieter Claeys, Jean-Sebastien Caux, Dimitri Van Neck, Stijn De Baerdemacker
[arXiv:1707.06793]  orcid nr: 0000-0001-7933-3227

Gertian Roose

Gertian Roose

PhD student

gertian.roose@ugent.be

office: 120 032

Tel: +32 – (0)9 – 264 45 19

 

Research interests:

Dynamical mass generation in the Gross-Neveu model using tensor network methods

Maarten Van Damme

Maarten Van Damme

PhD student

maarten.vandamme@ugent.be

office: 120 005

Tel: +32 – (0)9 – 264 49 76

 

Research interests:

Investigating spin chain excitations using matrix product states

Simulation of thermalisation

Jonas Verhellen

Jonas Verhellen

PhD student

jonas.verhellen@ugent.be

office: 120 032

Tel: +32 – (0)9 – 264 45 19

 

Research interests

Continuous Tensor Networks for Quantum Field Theories

In the past two to three decades, quantum information concepts – specifically entanglement entropy and similar measures – have been successfully used to gain a better understanding of quantum many-body systems. From this branch of research, the novel concept of a ‘tensor network’ – a convenient ground-state Ansatz that faithfully describes low-energy states of quantum many-body systems – has emerged. The endeavour to extend these tensor network ideas to quantum field theories is firmly motivated by the intimate relation between condensed matter physics and the study of quantum field theory.

Holography and Quantum Information

During the latter half of the previous century, it was inferred from the thermodynamic black hole physics that certain facets of quantum gravity can be described by the quantum field degrees of freedom of a lower-dimensional (so-called holographic) surface. The postulate that claims the validity of the above statement for all realistic quantum gravity theories is widely known as the holographic principle. Recently, strong links between the holographic principle and aspects of quantum information, like entanglement entropy and quantum error correction, have been discovered. In addition, tensor network techniques have been designed to support the further development of quantum information theory in holography.

Computational Fluid Dynamics (with a strong preference for MHD)

In the past I have worked on the theory of ideal magnetohydrodynamics, a fluid model for plasma physics, on both a theoretical and a purely computational level. Even though I am currently not actively pursuing any further research in this field, I remain strongly interested in the topic. The techniques from computational fluid dynamics remain remarkably relevant to my current research, as variational optimalization on tensor networks also requires a numerical approach that deals with non-linear ODEs and PDEs.