Article
Physics, Particles & Fields
Adamu Issifu, Francisco A. A. Brito
Summary: This paper develops models for phenomenological particle physics based on the string analogy of particles. These models can be used to investigate various phenomenological aspects, including confinement, deconfinement, chiral condensate, QGP phase transitions, and the evolution of the early universe. Additionally, properties such as scalar glueball mass, gluon mass, glueball-meson mixing states, QCD vacuum, and color superconductivity can also be explored using these model frameworks. The paper concludes by using one of the models to describe the phenomenon of color confinement among glueballs. These models are built upon the modified Dirac-Born-Infeld (DBI) action for open strings with endpoints on a Dp-brane or brane-anti-brane at a tachyonic vacuum.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Materials Science, Multidisciplinary
Jintae Kim, Yun-Tak Oh, Jung Hoon Han
Summary: The study reveals that the parent LGT of the F3 model is a hybrid of rank-1 and rank-2 U(1) LGT, and develops the corresponding field theory. The resulting Lagrangian of the F3 model connects the dynamics of fractons to that of fluxons.
Article
Mechanics
Kamel Berkache, Srikantha Phani, Jean-Francois Ganghoffer
Summary: The effective elastic properties and mode I elastic fracture toughness of three isotropic planar lattices - hexagonal, kagome, and triangular - are studied from a micropolar continuum perspective. The results show that different lattices exhibit different dominant properties under macroscopic loading, and their micropolar internal length parameters and elastic properties have a close scaling relationship with relative density. Compared to the triangular and kagome lattices of identical relative density, the hexagonal lattice exhibits an order of magnitude higher couple stress intensity factor, indicating the importance of micropolar effects in bending dominated architectures.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Physics, Particles & Fields
Federico Finkel, Artemio Gonzalez-Lopez
Summary: This study introduces a family of inhomogeneous XX spin chains and investigates the asymptotic approximation of Renyi entanglement entropy under constant magnetic field at half filling. The results show a good agreement with numerical calculations and also highlight the behavior in non-standard scenarios.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Andrey Yu Kotov, Daniel Nogradi, Kalman K. Szabo, Lorinc Szikszai
Summary: In this study, we continue to investigate the dependence on the number of fermions by extending simulations to N-f = 7, 8, 9, 10. We also examine the N-f dependence of finite volume effects and a specific lattice artifact phase related to staggered fermions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Manuel Campos, Esperanza Lopez, German Sierra
Summary: The study focuses on massless and massive free bosons on a 2D lattice, utilizing methods of exactly solvable models, diagonalizing the row-to-row transfer matrix, and implementing the quantum inverse scattering method to construct two factorized scattering S matrix models. These results position the free boson model in 2D among other exactly solvable models, potentially offering applications in quantum computation.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Materials Science, Multidisciplinary
Vladislav Borisov, Yaroslav O. Kvashnin, Nikolaos Ntallis, Danny Thonig, Patrik Thunstrom, Manuel Pereiro, Anders Bergman, Erik Sjoqvist, Anna Delin, Lars Nordstrom, Olle Eriksson
Summary: The Dzyaloshinskii-Moriya (DM) interaction and symmetric anisotropic exchange play crucial roles in stabilizing topologically nontrivial magnetic textures. The impact of electron-electron correlations on these interactions can lead to significant changes, necessitating a fully relativistic treatment of the electronic structure.
Article
Materials Science, Multidisciplinary
Olivier Simard, Martin Eckstein, Philipp Werner
Summary: This study investigates the impact of interaction corrections on the optical conductivity based on dynamical mean-field theory, finding the evolution characteristics of pi-ton under nonequilibrium conditions.
Article
Physics, Particles & Fields
Fabian Mueller, Akaki Rusetsky
Summary: Through non-relativistic effective field theory, a three-particle analog of the Lellouch-Luscher formula at the leading order has been derived. This formula establishes a connection between three-particle decay amplitudes in a finite volume and their infinite-volume counterparts, making it applicable for lattice studies on three-particle decays. The potential generalization of this approach to higher orders has also been briefly discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Ruairi Brett, Chris Culver, Maxim Mai, Andrei Alexandru, Michael Doring, Frank X. Lee
Summary: In this study, a fit of the finite-volume QCD spectrum of three pions at maximal isospin was performed to constrain the three-body force. Results indicate consistency with a constant contact term close to zero for heavier pion mass, while showing statistically significant energy dependence for lighter mass. The findings also suggest the potential to constrain the two-body amplitude with sufficient three-body energy levels.
Article
Quantum Science & Technology
Torin F. Stetina, Anthony Ciavarella, Xiaosong Li, Nathan Wiebe
Summary: In recent years, quantum computing has emerged as a preeminent application in the simulations of chemistry and condensed materials, offering exponential speedup for solving the electronic structure of certain strongly correlated electronic systems. This study shows that effective quantum electrodynamics (QED), equivalent to QED to second order in perturbation theory, can be simulated on a quantum computer in polynomial time while properly treating all four components of the wavefunction. The authors provide a detailed analysis of such simulations in position and momentum bases using Trotter-Suzuki formulas and discuss their findings on gate counts for simulating relativistic versions of the uniform electron gas.
Article
Physics, Particles & Fields
Joseph Karpie, Kostas Orginos, Anatoly Radyushkin, Savvas Zafeiropoulos
Summary: In this study, continuum limit results for the unpolarized parton distribution function of the nucleon in lattice QCD are presented. The pseudo-PDF approach with Short Distance Factorization was utilized for the first time, and findings were compared with phenomenological determinations. The sGEVP technique was employed to optimize control over excited state contamination in calculations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Review
Physics, Multidisciplinary
Luigi Del Debbio, Alberto Ramos
Summary: Lattice QCD has established itself as a mature field, providing precise descriptions of the standard model and determining essential quantities such as the strong coupling constant. In addition, lattice calculations will be crucial in future phenomenological studies.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
Article
Mathematics, Applied
Zhenning Cai, Xiaoyu Dong, Yang Kuang
Summary: Through in-depth analysis of the complex Langevin method and its limitations, we reveal that the absence of localized probability density functions leads to unstable behavior, while the gauge cooling technique helps confine samples in certain cases, significantly broadening its application.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2021)
Article
Astronomy & Astrophysics
Nikolai Husung, Peter Marquard, Rainer Sommer
Summary: This study investigates the spectral quantities in lattice QCD and determines the asymptotic behavior of their discretization errors. Various combinations of fermions and gauge actions are considered, and the asymptotic cutoff effects are analyzed. The study proposes the use of tree-level O(a2) improvement for both fermions and gauge actions to enhance the asymptotic behavior.
Article
Optics
M. Valiente, C. W. Duncan, N. T. Zinner
Summary: This study introduces a formalism known as the super Hamiltonian, which extends generic quantum-mechanical Hamiltonians to higher dimensions, projecting eigenstates of the original Hamiltonian as super Hamiltonian in superspace. By applying this method to one-dimensional quasiperiodic potentials, continuously labelled eigenstates corresponding to a continuous spectrum are obtained, all of which are quasiperiodic. The formalism is extended to open boundary conditions, opening up new possibilities for studying the physics of electrons, atoms, or light in quasicrystalline and other aperiodic media.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Kasper Poulsen, Nikolaj T. Zinner
Summary: Giant magnetoresistance has been observed in a spin chain composed of weakly interacting layers of strongly coupled spins, even in systems as small as four spins. The effect is driven by a mismatch in the energy spectrum leading to spin excitations being reflected at layer boundaries, which can be controlled by external magnetic fields to achieve giant magnetoresistance. A simple rule based on the energy levels of the strongly coupled spins can predict the behavior of spin transport under the influence of a magnetic field.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
E. Bahnsen, S. E. Rasmussen, N. J. S. Loft, N. T. Zinner
Summary: As the application of quantum technology approaches, leveraging current quantum resources becomes crucial. Utilizing the diamond gate instead of standard gates has shown to be more efficient in compiling quantum algorithms. These gates can be decomposed into standard gates and have a wide range of applications in quantum machine learning.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Kasper Poulsen, Alan C. Santos, Nikolaj T. Zinner
Summary: We propose a quantum Wheatstone bridge as a fully quantum analog to the classical version, which exploits quantum effects to enhance sensitivity to an unknown coupling. This can be used in fields such as sensing and metrology.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Stig Elkjaer Rasmussen, Nikolaj Thomas Zinner
Summary: This study focuses on the effect of parameterized two-qubit gates in the variational quantum eigensolver. By simulating the algorithm using fixed and parameterized two-qubit gates, it is shown that the parameterized versions outperform the fixed versions in terms of best energy and reducing outliers.
ANNALEN DER PHYSIK
(2022)
Article
Quantum Science & Technology
Frederik Kofoed Marqversen, Nikolaj Thomas Zinner
Summary: We discuss the procedure for obtaining measurement-based implementations of quantum algorithms given by quantum circuit diagrams and how to reduce the required resources needed for a given measurement-based computation. This forms the foundation for quantum computing on photonic systems in the near term. To demonstrate that these ideas are well grounded we present three different problems which are solved by employing a measurement-based implementation of the variational quantum eigensolver algorithm (MBVQE). We show that by utilising native measurement-based gates rather than standard gates, such as the standard controlled not gate (CNOT), measurement-based quantum computations may be obtained that are both shallow and have simple connectivity while simultaneously exhibiting a large expressibility. We conclude that MBVQE has promising prospects for resource states that are not far from what is already available today.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Lasse Bjorn Kristensen, Morten Kjaergaard, Christian Kraglund Andersen, Nikolaj Thomas Zinner
Summary: This research presents a hybrid approach combining autonomous correction and traditional measurement-based quantum error correction to correct the dominant phase and decay errors in superconducting qubit architectures. Numerical simulations demonstrate that this scheme can significantly increase the storage time by five to ten times and requires only six qubits for encoding and two ancillary qubits for autonomous correction, leading to a substantial reduction in qubit overhead compared to typical measurement-based error-correction schemes. Furthermore, this scheme can be implemented in a wide range of architectures as it relies on standard interactions and qubit driving available in most major quantum computing platforms.
Article
Chemistry, Multidisciplinary
Marco Majland, Rasmus Berg Jensen, Mads Greisen Hojlund, Nikolaj Thomas Zinner, Ove Christiansen
Summary: The excessive measurement overheads in estimating physical quantities hinder the demonstration of practical quantum advantages for near-term devices. However, the reduction in resource requirements for computing anharmonic, vibrational states remains unexplored compared to its electronic counterpart. Through the manipulation of vibrational systems, such as employing coordinate transformations, we can significantly reduce the number of measurements needed to estimate anharmonic, vibrational states.
Article
Materials Science, Multidisciplinary
A. Alnor, T. Baekkegaard, N. T. Zinner
Summary: Different topological phases of quantum systems have been a focus of research in recent decades. This study goes beyond typical spin-1/2 systems and explores the realization of higher Chern numbers and the emergence of different topological phases using spin-1 systems. The results show that rich topological phase diagrams can be achieved through numerical and analytical methods, and the realistic implementation of spin-1 systems in superconducting circuits holds promise for experimental verification of these theoretical predictions.
Article
Optics
S. E. Rasmussen, N. T. Zinner
Summary: In this paper, the entangling quantum generative adversarial network (EQ-GAN) is investigated for multiqubit learning. It is shown that EQ-GAN can learn circuits more efficiently than SWAP test and generate excellent overlap matrix elements for learning VQE states of small molecules. However, the lack of phase estimation prevents it from directly estimating energy. Additionally, EQ-GAN demonstrates its potential in learning random states.
Article
Physics, Fluids & Plasmas
Kasper Poulsen, Nikolaj T. Zinner
Summary: Heat and noise control are crucial for the development of quantum technologies. Heat rectifiers, which allow for one-way heat transport, are powerful tools for this purpose. We propose a rectifier based on the unidirectionality of a low temperature bath, which can block heat transport in one configuration but allow it in the other.
Article
Optics
Kasper Poulsen, Alan C. Santos, Lasse B. Kristensen, Nikolaj T. Zinner
Summary: This study introduces a class of quantum rectifiers that can improve performance by utilizing quantum entanglement. By coupling two small spin chains through a double-slit interface, rectification can be significantly enhanced, even in small systems, and the effect can withstand noisy environments.
Article
Physics, Fluids & Plasmas
Kasper Poulsen, Marco Majland, Seth Lloyd, Morten Kjaergaard, Nikolaj T. Zinner
Summary: Maxwell's demon is a quintessential example of information control necessary for designing quantum devices. Our study demonstrates that non-Markovian effects can be exploited to optimize the information transfer rate in quantum Maxwell demons.
Article
Quantum Science & Technology
S. E. Rasmussen, K. S. Christensen, S. P. Pedersen, L. B. Kristensen, T. Baekkegaard, N. J. S. Loft, N. T. Zinner
Summary: This tutorial provides an introductory treatment of circuit analysis of superconducting qubits, including couplings, microwave driving, and noise considerations. It is intended for new researchers with limited experience and covers basic methods, examples, and common circuit designs for quantum-information applications.
Article
Materials Science, Multidisciplinary
Simon Panyella Pedersen, Nikolaj Thomas Zinner
Summary: Lattice gauge theories are fundamental in particle physics and there is increasing interest in studying nonequilibrium effects like dynamical quantum phase transitions. A U(1) quantum link model in (1 + 1)D was studied after quenches of its mass term, revealing dynamical quantum phase transitions for all system sizes. A gauge-invariant string order parameter was devised and implemented for experimental study in near-term devices, with vortices in phases indicating zeros of relevant amplitudes. Furthermore, a class of superconducting circuits for implementing U(1) quantum link models was proposed and shown to achieve target dynamics with high fidelity. Additionally, a method for readout of the circuit was suggested for accessing information about all degrees of freedom.
