Thomas Luu
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View article: Exclusion of a diquark–anti-diquark structure for the lightest positive-parity charmed mesons
Exclusion of a diquark–anti-diquark structure for the lightest positive-parity charmed mesons Open
The nature of low-lying scalar and axial-vector charmed mesons has been debated for decades, with hadronic molecular and compact tetraquark models being prominent candidates. These two models predict quite different features for the access…
View article: Fully ergodic simulations using radial updates
Fully ergodic simulations using radial updates Open
A sensible application of the hybrid Monte Carlo (HMC) method is often hindered by the presence of large—or even infinite—potential barriers. These potential barriers separate the configuration space into distinct sectors and can lead to e…
View article: Quantum sampling on a quantum annealer for large volumes in the strong coupling limit for gauge group U(3)
Quantum sampling on a quantum annealer for large volumes in the strong coupling limit for gauge group U(3) Open
In our previous studies [., Proc. Sci. LATTICE2023 () 219 [].], we confirmed that a quantum annealer can be used for importance sampling of gauge theories. In this paper, we extend the previous results to larger 2-dimensional and 4-dimensi…
View article: Search for Stable States in Two-Body Excitations of the Hubbard Model on the Honeycomb Lattice
Search for Stable States in Two-Body Excitations of the Hubbard Model on the Honeycomb Lattice Open
We present one- and two-body measurements for the Hubbard model on the honeycomb (graphene) lattice from ab-initio quantum monte carlo simulations. Of particular interest is excitons, which are particle/hole excitations in low-dimensional …
View article: Exploring Group Convolutional Networks for Sign Problem Mitigation via Contour Deformation
Exploring Group Convolutional Networks for Sign Problem Mitigation via Contour Deformation Open
The sign problem that arises in Hybrid Monte Carlo calculations can be mitigated by deforming the integration manifold. While simple transformations are highly efficient for simulation, their efficacy systematically decreases with decreasi…
View article: Search for Stable States in Two-Body Excitations of the Hubbard Model on the Honeycomb Lattice
Search for Stable States in Two-Body Excitations of the Hubbard Model on the Honeycomb Lattice Open
We present one- and two-body measurements for the Hubbard model on the honeycomb (graphene) lattice from ab-initio quantum monte carlo simulations. Of particular interest is excitons, which are particle/hole excitations in low-dimensional …
View article: Exploring Group Convolutional Networks for Sign Problem Mitigation via Contour Deformation
Exploring Group Convolutional Networks for Sign Problem Mitigation via Contour Deformation Open
The sign problem that arises in Hybrid Monte Carlo calculations can be mitigated by deforming the integration manifold. While simple transformations are highly efficient for simulation, their efficacy systematically decreases with decreasi…
View article: An Extraordinary Case of Prosthetic Joint Infection by Listeria monocytogenes and Histoplasma capsulatum
An Extraordinary Case of Prosthetic Joint Infection by Listeria monocytogenes and Histoplasma capsulatum Open
Prosthetic joint infections (PJIs) are serious complications of hip and knee arthroplasty. Gram-positive organisms are the most common etiology of PJIs. Less common bacteria and certain fungi may also present as culprits on rare occasions.…
View article: Quantum sampling on a quantum annealer for large volumes in the strong coupling limit for gauge group U(3)
Quantum sampling on a quantum annealer for large volumes in the strong coupling limit for gauge group U(3) Open
In our previous studies [1, 2], we confirmed that a quantum annealer can be used for importance sampling of gauge theories. In this paper, we extend the previous results to larger 2-dimensional and 4-dimensional lattices to generate ensemb…
View article: Hubbard interaction at finite $T$ on a hexagonal lattice
Hubbard interaction at finite $T$ on a hexagonal lattice Open
The temporal finite volume induces significant effects in Monte Carlo simulations of systems in low dimensions, such as graphene, a 2-D hexagonal system known for its unique electronic properties and numerous potential applications. In thi…
View article: Overcoming Ergodicity Problems of the Hybrid Monte Carlo Method using Radial Updates
Overcoming Ergodicity Problems of the Hybrid Monte Carlo Method using Radial Updates Open
Despite its many advantages, the sensible application of the Hybrid Monte Carlo (HMC) method is often hindered by the presence of large - or even infinite - potential barriers. These potential barriers partition the configuration space int…
View article: ILP-based resource optimization realized by quantum annealing for optical wide-area communication networks—A framework for solving combinatorial problems of a real-world application by quantum annealing
ILP-based resource optimization realized by quantum annealing for optical wide-area communication networks—A framework for solving combinatorial problems of a real-world application by quantum annealing Open
Resource allocation of wide-area internet networks is inherently a combinatorial optimization problem that if solved quickly, could provide near real-time adaptive control of internet-protocol traffic ensuring increased network efficacy an…
View article: Single Particle Spectrum of Doped $\mathrm{C}_{20}\mathrm{H}_{12}$-Perylene
Single Particle Spectrum of Doped $\mathrm{C}_{20}\mathrm{H}_{12}$-Perylene Open
We present a Hamiltonian Monte Carlo study of doped perylene $\mathrm{C}_{20}\mathrm{H}_{12}$ described with the Hubbard model. Doped perylene can be used for organic light-emitting diodes (OLEDs) or as acceptor material in organic solar c…
View article: Effective theory for graphene nanoribbons with junctions
Effective theory for graphene nanoribbons with junctions Open
Graphene nanoribbons are a promising candidate for fault-tolerant quantum electronics. In this scenario, qubits are realized by localized states that can emerge on junctions in hybrid ribbons formed by two armchair nanoribbons of different…
View article: Reducing the Sign Problem with simple Contour Deformation
Reducing the Sign Problem with simple Contour Deformation Open
We apply constant imaginary offsets to the path integral for a reduction of\nthe sign problem in the Hubbard model. These simple transformations enhance the\nquality of results from HMC calculations without compromising the speed of the\na…
View article: An Effective Theory for Graphene Nanoribbons with Junctions
An Effective Theory for Graphene Nanoribbons with Junctions Open
Graphene nanoribbons are a promising candidate for fault-tolerant quantum electronics. In this scenario, qubits are realised by localised states that can emerge on junctions in hybrid ribbons formed by two armchair nanoribbons of different…
View article: ILP-based Resource Optimization Realized by Quantum Annealing for Optical Wide-area Communication Networks -- A Framework for Solving Combinatorial Problems of a Real-world Application by Quantum Annealing
ILP-based Resource Optimization Realized by Quantum Annealing for Optical Wide-area Communication Networks -- A Framework for Solving Combinatorial Problems of a Real-world Application by Quantum Annealing Open
Resource allocation of wide-area internet networks is inherently a combinatorial optimization problem that if solved quickly, could provide near real-time adaptive control of internet-protocol traffic ensuring increased network efficacy an…
View article: From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems
From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems Open
The numerical sign problem poses a seemingly insurmountable barrier to the simulation of many fascinating systems. We apply neural networks to deform the region of integration, mitigating the sign problem of systems with strongly correlate…
View article: Testing importance sampling on a quantum annealer for strong coupling $SU(3)$ gauge theory
Testing importance sampling on a quantum annealer for strong coupling $SU(3)$ gauge theory Open
$SU(N_c)$ gauge theories in the strong coupling limit can be described by integer variables representing monomers, dimers and baryon loops. We demonstrate how the D-wave quantum annealer can perform importance sampling on $U(N_c)$ gauge th…
View article: From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems
From Theory to Practice: Applying Neural Networks to Simulate Real Systems with Sign Problems Open
The numerical sign problem poses a seemingly insurmountable barrier to the simulation of many fascinating systems. We apply neural networks to deform the region of integration, mitigating the sign problem of systems with strongly correlate…
View article: Testing importance sampling on a quantum annealer for strong coupling SU(3) gauge theory
Testing importance sampling on a quantum annealer for strong coupling SU(3) gauge theory Open
$SU(N_c)$ gauge theories in the strong coupling limit can be described by integer variables representing monomers, dimers and baryon loops. We demonstrate how the D-wave quantum annealer can perform importance sampling on $U(N_c)$ gauge th…
View article: $U(N)$ gauge theory in the strong coupling limit on a quantum annealer
$U(N)$ gauge theory in the strong coupling limit on a quantum annealer Open
Lattice QCD in the strong coupling regime can be formulated in dual variables which are integer-valued. It can be efficiently simulated for modest finite temperatures and finite densities via the worm algorithm, circumventing the finite de…
View article: Fermionic Sign Problem Minimization by Constant Path Integral Contour Shifts
Fermionic Sign Problem Minimization by Constant Path Integral Contour Shifts Open
The path integral formulation of quantum mechanical problems including fermions is often affected by a severe numerical sign problem. We show how such a sign problem can be alleviated by a judiciously chosen constant imaginary offset to th…
View article: Tactile Network Resource Allocation enabled by Quantum Annealing based on ILP Modeling
Tactile Network Resource Allocation enabled by Quantum Annealing based on ILP Modeling Open
Agile networks with fast adaptation and reconfiguration capabilities are required for on-demand provisioning of various network services. We propose a new methodical framework for short-time network optimization based on quantum computing …
View article: Two particles interacting via a contact interaction on $$S^2$$
Two particles interacting via a contact interaction on $$S^2$$ Open
We consider two particles interacting via a contact interaction that are constrained to a sphere, or $$S^2$$ . We determine their spectrum to arbitrary precision and for arbitrary angular momentum. We show how the non-inertial frame le…
View article: Constraining the Nucleon EDM due to BSM on the Lattice
Constraining the Nucleon EDM due to BSM on the Lattice Open
We discuss how lattice QCD calculations are used to calculate the induced nucleon electric dipole moment due to various flavor-diagonal CP-violating operators, some of which originate from beyond the standard model. We describe the implica…
View article: The Semimetal-Antiferromagnetic Mott Insulator Quantum Phase Transition of the Hubbard Model on the Honeycomb Lattice
The Semimetal-Antiferromagnetic Mott Insulator Quantum Phase Transition of the Hubbard Model on the Honeycomb Lattice Open
The Hubbard model on the honeycomb lattice undergoes a quantum phase\ntransition from a semimetallic to a Mott insulating phase and from a disordered\nto an anti-ferromagnetically phase. We show that these transitions occur\nsimultaneously…