Research Explorer

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Researcher

Stijn De Baerdemacker

Awards & Distinctions

82 Results

2023

Capturing correlation in the spin frustrated H3-ring using the generator coordinate method and spin-constrained generalised Hartree-Fock states

Xeno De VriendtJohn De VosStijn De BaerdemackerPatrick BultinckGuillaume Acke

A2 Journal Article in MOLECULAR PHYSICS

2022

Uncovering phase transitions that underpin the flat-planes in the tilted Hubbard model using subsystems and entanglement measures

Xeno De VriendtDaria Van HendeStijn De BaerdemackerPatrick BultinckGuillaume Acke

A1 Journal Article in JOURNAL OF CHEMICAL PHYSICS

2021

Quantifying delocalization and static correlation errors by imposing (spin)population redistributions through constraints on atomic domains

Xeno De VriendtLaurent LemmensStijn De BaerdemackerPatrick BultinckGuillaume Acke

A1 Journal Article in JOURNAL OF CHEMICAL THEORY AND COMPUTATION

2018

A unified approach to quantum computation and classical reversible computation

Alexis De VosStijn De Baerdemacker

Direct variational determination of the two-electron reduced density matrix for doubly occupied-configuration-interaction wave functions : the influence of three-index N-representability conditions

Diego R AlcobaAlicia TorreLuis LainGustavo E MassaccesiOfelia B OnaEduardo M HonoreWard PoelmansDimitri Van NeckPatrick BultinckStijn De Baerdemacker

A1 Journal Article in JOURNAL OF CHEMICAL PHYSICS

Method for making 2-electron response reduced density matrices approximately N-representable

Caitlin LanssensPaul W AyersDimitri Van NeckStijn De BaerdemackerKlaas GunstPatrick Bultinck

A1 Journal Article in JOURNAL OF CHEMICAL PHYSICS

Richardson-Gaudin models and broken integrability

Pieter ClaeysDimitri Van NeckStijn De Baerdemacker

2017

Block product density matrix embedding theory for strongly correlated spin systems

Klaas GunstSebastian WoutersStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in PHYSICAL REVIEW B

Inner products in integrable Richardson-Gaudin models

Pieter ClaeysStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in SCIPOST PHYSICS

Strategies for extending geminal-based wavefunctions : open shells and beyond

Paul A JohnsonPeter A LimacherTaewon D KimMichael RicherRamon Alain Miranda-QuintanaFarnaz Heidar ZadehPaul W AyersPatrick BultinckStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in COMPUTATIONAL AND THEORETICAL CHEMISTRY

The Birkhoff theorem for unitary matrices of arbitrary dimensions

Stijn De BaerdemackerAlexis De VosLin ChenLi Yu

A1 Journal Article in LINEAR ALGEBRA AND ITS APPLICATIONS

Variational method for integrability-breaking Richardson-Gaudin models

Pieter ClaeysJean-Sébastien CauxDimitri Van NeckStijn De Baerdemacker

A1 Journal Article in PHYSICAL REVIEW B

2016

Block-ZXZ synthesis of an arbitrary quantum circuit

Alexis De VosStijn De Baerdemacker

A1 Journal Article in PHYSICAL REVIEW A

Constrained CI calculations to investigate charge transfer and the effects of the integer nature of the electron

Mario Van RaemdonckStijn De BaerdemackerGuillaume AckeFrank De ProftDimitri Van NeckPatrick Bultinck

Maximum probability domains for Hubbard models

Guillaume AckeStijn De BaerdemackerPieter ClaeysMario Van RaemdonckWard PoelmansDimitri Van NeckPatrick Bultinck

A1 Journal Article in MOLECULAR PHYSICS

Read-Green resonances in a topological superconductor coupled to a bath

Pieter ClaeysStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in PHYSICAL REVIEW B

Seniority as a tool for truncating configuration interaction wave functions, and constructing pair Hamiltonians

Mario Van RaemdonckPatrick BultinckDimitri Van NeckStijn De BaerdemackerFrank De Proft

The Birkhoff theorem for unitary matrices of prime dimension

Alexis De VosStijn De Baerdemacker

A1 Journal Article in LINEAR ALGEBRA AND ITS APPLICATIONS

The decomposition of U(n) into XU(n) and ZU(n)

Alexis De VosStijn De Baerdemacker

A1 Journal Article in JOURNAL OF MULTIPLE-VALUED LOGIC AND SOFT COMPUTING

The group zoo of classical reversible computing and quantum computing

Alexis De VosStijn De Baerdemacker

Bookchapter in Advances in unconventional computing, volume 1 : theory

The synthesis of a quantum circuit

Alexis De VosStijn De Baerdemacker

Bookchapter in Problems and new solutions in the Boolean domain

2015

CheMPS2 : improved DMRG-SCF routine and correlation functions

Sebastian WoutersWard PoelmansStijn De BaerdemackerPaul W AyersDimitri Van Neck

A1 Journal Article in COMPUTER PHYSICS COMMUNICATIONS

Eigenvalue-based determinants for scalar products and form factors in Richardson-Gaudin integrable models coupled to a bosonic mode

Pieter ClaeysStijn De BaerdemackerMario Van RaemdonckDimitri Van Neck

A1 Journal Article in JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL

Eigenvalue-based method and form-factor determinant representations for integrable XXZ Richardson-Gaudin models

Pieter ClaeysStijn De BaerdemackerMario Van RaemdonckDimitri Van Neck

A1 Journal Article in PHYSICAL REVIEW B

Low dimensional physics in metal organic frameworks : a DFT study of breathing MIL-47

Danny VanpouckeJan JaekenStijn De BaerdemackerKurt LejaeghereVeronique Van Speybroeck

On two subgroups of U(n), useful for quantum computing

Alexis De VosStijn De Baerdemacker

Polynomial scaling approximations and dynamic correlation corrections to doubly occupied configuration interaction wave functions

Mario Van RaemdonckDiego R AlcobaWard PoelmansStijn De BaerdemackerAlicia TorreLuis LainGustavo E MassaccesiDimitri Van NeckPatrick Bultinck

A1 Journal Article in JOURNAL OF CHEMICAL PHYSICS

The Dicke model as the contraction limit of a pseudo-deformed Richardson-Gaudin model

Pieter ClaeysStijn De BaerdemackerMario Van RaemdonckDimitri Van Neck

Variational optimization of the second-order density matrix corresponding to a seniority-zero configuration interaction wave function

Ward PoelmansMario Van RaemdonckBrecht VerstichelStijn De BaerdemackerAlicia TorreLuis LainGustavo E MassaccesiDiego R AlcobaPatrick BultinckDimitri Van Neck

A1 Journal Article in JOURNAL OF CHEMICAL THEORY AND COMPUTATION

2014

Efficient description of strongly correlated electrons with mean-field cost

Katharina BoguslawskiPaweł TecmerPaul W AyersPatrick BultinckStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in PHYSICAL REVIEW B

Exact solution of the p(x) + ip(y) pairing Hamiltonian by deforming the pairing algebra

Mario Van RaemdonckStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in PHYSICAL REVIEW B

Exploring the phase diagram of the px + ipy pairing Hamiltonian by linking the eigenstates to associated bosonic states.

Mario Van RaemdonckStijn De BaerdemackerDimitri Van Neck

Matrix calculus for classical and quantum circuits

Alexis De VosStijn De Baerdemacker

A1 Journal Article in ACM JOURNAL ON EMERGING TECHNOLOGIES IN COMPUTING SYSTEMS

New quasi-1D materials: DFT-study of breathing metal-organic frameworks

Danny VanpouckeJan JaekenStijn De BaerdemackerKurt LejaeghereAn GhyselsMichel WaroquierVeronique Van Speybroeck

Nonvariational orbital optimization techniques for the AP1roG wave function

Katharina BoguslawskiPawel TecmerPatrick BultinckStijn De BaerdemackerDimitri Van NeckPaul W Ayers

A1 Journal Article in JOURNAL OF CHEMICAL THEORY AND COMPUTATION

On two subgroups of U(n), important for quantum computing

Alexis De VosStijn De Baerdemacker

Probing pairing correlations in Sn isotopes using Richardson-Gaudin integrability

Stijn De BaerdemackerVeerle HellemansRianne van den BergJean-Sébastien CauxKristiaan HeydeMario Van RaemdonckDimitri Van NeckPaul A Johnson

Projected seniority-two orbital optimization of the antisymmetric product of one-reference orbital geminal

Katharina BoguslawskiPawel TecmerPeter A LimacherPaul JohnsonPaul W AyersPatrick BultinckStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in JOURNAL OF CHEMICAL PHYSICS

Quasi-1D physics in breathing metal-organic frameworks

Danny VanpouckeJan JaekenStijn De BaerdemackerVeronique Van SpeybroeckKurt Lejaeghere

Quasi-1D physics in metal-organic frameworks : MIL-47(V) from first principles

Danny VanpouckeJan JaekenStijn De BaerdemackerKurt LejaeghereVeronique Van Speybroeck

A1 Journal Article in BEILSTEIN JOURNAL OF NANOTECHNOLOGY

Scaling a unitary matrix

Alexis De VosStijn De Baerdemacker

A1 Journal Article in OPEN SYSTEMS & INFORMATION DYNAMICS

Simple and inexpensive perturbative correction schemes for antisymmetric products of nonorthogonal geminals

Peter A LimacherPaul W AyersPaul JohnsonStijn De BaerdemackerDimitri Van NeckPatrick Bultinck

A1 Journal Article in PHYSICAL CHEMISTRY CHEMICAL PHYSICS

The decomposition of U(n) into XU(n) and ZU(n)

Alexis De VosStijn De Baerdemacker

The influence of orbital rotation on the energy of closed-shell wavefunctions

Peter A LimacherTaewon D KimPaul W AyersPaul JohnsonStijn De BaerdemackerDimitri Van NeckPatrick Bultinck

A1 Journal Article in MOLECULAR PHYSICS

The synthesis of a quantum circuit

Alexis De VosStijn De Baerdemacker

Variational optimization of the 2DM: approaching three-index accuracy using extended cluster constraints

Brecht VerstichelWard PoelmansStijn De BaerdemackerSebastian WoutersDimitri Van Neck

A1 Journal Article in EUROPEAN PHYSICAL JOURNAL B

2013

A new mean-field method suitable for strongly correlated electrons : computationally facile antisymmetric products of nonorthogonal geminals

Peter A LimacherPaul W AyersPaul JohnsonStijn De BaerdemackerDimitri Van NeckPatrick Bultinck

A1 Journal Article in JOURNAL OF CHEMICAL THEORY AND COMPUTATION

A size-consistent approach to strongly correlated systems using a generalized antisymmetrized product of nonorthogonal geminals

Paul JohnsonPaul W AyersPeter A LimacherStijn De BaerdemackerDimitri Van NeckPatrick Bultinck

A1 Journal Article in COMPUTATIONAL AND THEORETICAL CHEMISTRY

Perturbations on the superconducting state of metallic nanoparticles: influence of geometry and impurities

Mario Van RaemdonckStijn De BaerdemackerDimitri Van Neck

A1 Journal Article in EUROPEAN PHYSICAL JOURNAL D

Richardson-Gaudin integrable systems (and beyond) for strongly correlated quantum many-body systems

Stijn De BaerdemackerPaul W AyersPatrick BultinckPaul A JohnsonPeter A LimacherDimitri Van NeckMario Van Raemdonck

The NEGATOR as a basic building block for quantum circuits

Alexis De VosStijn De Baerdemacker

A1 Journal Article in OPEN SYSTEMS & INFORMATION DYNAMICS

The Tamm-Dancoff approximation as the contraction limit of the Richardson-Gaudin equations

Stijn De Baerdemacker

2012

A Khon-Sham-like model for the l-body reduced density matrix from a strongly-correlated reference

PA JohnsonPW AyersStijn De BaerdemackerDimitri Van NeckPatrick Bultinck

Logics between classical reversible logic and quantum logic

Alexis De VosStijn De Baerdemacker

Perturbations on the superconducting state of metallic nanoparticles: a canonical Richardson-Gaudin approach

Mario Van RaemdonckStijn De BaerdemackerDimitri Van Neck

Reversible computation, quantum computation and computer architectures in between

Alexis De VosMichiel BoesStijn De Baerdemacker

A1 Journal Article in JOURNAL OF MULTIPLE-VALUED LOGIC AND SOFT COMPUTING

Richardson-Gaudin description of pairing in atomic nuclei

Stijn De Baerdemacker

Richardson-Gaudin integrability in the contraction limit of the quasispin

Stijn De Baerdemacker

A1 Journal Article in PHYSICAL REVIEW C

The roots of the NOT gate

Alexis De VosStijn De Baerdemacker

2011

A primal-dual semidefinite programming algorithm tailored to the variational determination of the two-body density matrix

Brecht VerstichelHelen van AggelenDimitri Van NeckPatrick BultinckStijn De Baerdemacker

A1 Journal Article in COMPUTER PHYSICS COMMUNICATIONS

Symmetry groups for the decomposition of reversible computers, quantum computers, and computers in between

Alexis De VosStijn De Baerdemacker

A1 Journal Article in SYMMETRY-BASEL

The Tamm-Dancoff approximation as the boson limit of the Richardson-Gaudin equations for pairing

Stijn De Baerdemacker

2010

Decomposition of a linear reversible computer: digital versus analog

Alexis De VosStijn De Baerdemacker

A1 Journal Article in INTERNATIONAL JOURNAL OF UNCONVENTIONAL COMPUTING

Reversible computation, quantum computation, and computer architectures in between

Alexis De VosMichiel BoesStijn De Baerdemacker

2009

Collective structures within the Cartan-Weyl based geometrical model

Stijn De BaerdemackerKristiaan HeydeVeerle Hellemans

Criticality in the configuration-mixed interacting boson model: (2) Q(chi_1).Q(chi_1)-Q(chi_2).Q(chi_2) mixing

V HellemansP Van IsackerStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in Nuclear Physics A

Spectral properties of a tractable collective Hamiltonian

Stijn De BaerdemackerKristiaan HeydeV Hellemans

A1 Journal Article in Physical Review C

2008

Configuration mixing in the neutron-deficient 186-196Pb isotopes

V HellemansStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in Physical Review C

Criticality in the configuration-mixed interacting boson model: (1) U(5)-(Q)over-cap(chi) center dot (Q)over-cap(chi) mixing (vol 789, pg 164, 2007)

Veerle HellemansP VAN ISACKERStijn De BaerdemackerKristiaan Heyde

The quadrupole collective model from a Cartan-Weyl perspective

Stijn De BaerdemackerKristiaan HeydeV Hellemans

A1 Journal Article in JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL

2007

Criticality in the configuration-mixed interacting boson model: (1) U(5)-(Q)over-cap(chi)-(Q)over-cap (chi) mixing

Veerle HellemansP VAN ISACKERStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in NUCLEAR PHYSICS A

Phase transitions in the configuration mixed interacting boson model: U(5)-O(6) mixing

Veerle HellemansP VAN ISACKERStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in ACTA PHYSICA POLONICA B

Quadrupole collective variables in the natural Cartan-Weyl basis

Stijn De BaerdemackerKristiaan HeydeVeerle Hellemans

A1 Journal Article in JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL

The geometrical Bohr-Mottelson model:analytic solutions and an algebraic Cartan-Weyl perspective

Stijn De BaerdemackerK Heyde

2006

Solution of the Bohr Hamiltonian for a periodic potential with minimum at gamma=pi/6

Stijn De BaerdemackerL FORTUNATOVeerle HellemansKristiaan Heyde

A1 Journal Article in NUCLEAR PHYSICS A

Solution of the Bohr Hamiltonian for soft triaxial nuclei

L FORTUNATOStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in PHYSICAL REVIEW C

2005

A theoretical description of energy spectra and two-neutron separation energies for neutron-rich zirconium isotopes

JE GARCIA-RAMOSKristiaan HeydeR FOSSIONVeerle HellemansStijn De Baerdemacker

A1 Journal Article in EUROPEAN PHYSICAL JOURNAL A

Configuration mixing in Pb-188: Band structure and electromagnetic properties

Veerle HellemansR FOSSIONStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in PHYSICAL REVIEW C

Shape coexistence in the lead isotopes using algebraic models: Description of spectroscopic and ground-state related properties

Ruben FossionVeerle HellemansStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in ACTA PHYSICA POLONICA B

Soft triaxial rotor in the vicinity of gamma=pi/6 and its extensions

L FORTUNATOStijn De BaerdemackerKristiaan Heyde

A1 Journal Article in EUROPEAN PHYSICAL JOURNAL A

2004

Global and local behaviour of nuclear ground-state properties as fingerprints to shape coexistence in the lead isotopes

Ruben FossionVeerle HellemansStijn De BaerdemackerKristiaan Heyde

Phase transitions versus shape coexistence

Kristiaan HeydeJ JOLIERuben FossionStijn De BaerdemackerVeerle Hellemans

A1 Journal Article in PHYSICAL REVIEW C