BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Javier Molina-Vilaplana (Polytechnic University of Cartagena) DTSTART:20200508T133000Z DTEND:20200508T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/1 DESCRIPTION:Title: Non-Gaussian entanglement renormalization for quantum fields\nby Javier Molina-Vilaplana (Polytechnic University of Cartagena) as part of HEP-tensor network seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Luca Tagliacozzo (University of Barcelona) DTSTART:20200522T133000Z DTEND:20200522T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/2 DESCRIPTION:Title: Signatures of universality out of equilibrium\nby Luca Tagliacoz zo (University of Barcelona) as part of HEP-tensor network seminars\n\nAbs tract: TBA\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Karel Van Acoleyen (University of Ghent) DTSTART:20200618T133000Z DTEND:20200618T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/3 DESCRIPTION:Title: Entanglement compression in scale space: from MERA to MPOs\nby K arel Van Acoleyen (University of Ghent) as part of HEP-tensor network semi nars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Ananda Roy (Technical University of Munich) DTSTART:20200625T133000Z DTEND:20200625T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/4 DESCRIPTION:Title: Simulating Quantum Field Theories with Quantum Circuits\nby Anan da Roy (Technical University of Munich) as part of HEP-tensor network semi nars\n\n\nAbstract\nInvestigation of strongly interacting quantum field th eories (QFTs) remains one of the outstanding challenges of modern physics. Quantum simulation has the potential to be a crucial technique towards so lving this problem. By harnessing the power of quantum information process ing\, quantum simulation can potentially perform tasks deemed intractable by the classical information processing paradigm. In this talk\, I will sh ow that mesoscopic quantum electronic circuit lattices\, built with superc onducting capacitors and Josephson junctions\, can simulate certain bosoni c QFTs in 1+1 space-time dimensions. In contrast to conventional spin-chai n lattice-regularizations\, quantum circuits faithfully capture the non-pe rturbative properties of these QFTs and are experimentally-realizable with modern-day\, superconducting circuit technology. I will begin with the fr ee\, compactified boson conformal field theory and analyze its entanglemen t Hamiltonian for different boundary conditions using analytical and numer ical (density matrix renormalization group) techniques. Subsequently\, I w ill describe a quantum circuit lattice for an integrable deformation of th e free compactified boson QFT: the quantum sineGordon model. I will presen t analytical and numerical computations for the various thermodynamic prop erties of this model.\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Philipp Hauke (Universty of Trento) DTSTART:20200710T133000Z DTEND:20200710T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/5 DESCRIPTION:Title: Quantum simulating lattice gauge theories – How to make a quantum simulator obey Gauss’s law\nby Philipp Hauke (Universty of Trento) a s part of HEP-tensor network seminars\n\n\nAbstract\nThe difficulty of tac kling the out-of-equilibrium dynamics of gauge theories on classical compu ters is spurring a worldwide effort to solve these problems on dedicated q uantum simulator devices. In this talk\, I will discuss recent progress to wards quantum simulation of gauge theories. A particular focus will lie on a central issue in this context: How to ensure that the quantum simulator fulfills the local symmetry that defines the gauge theory? In other words \, how can one ensure that the ultracold atoms or superconducting qubits i n a quantum simulator behave as electrons\, positrons\, and electric field \, and mimic Gauss’s law of electrodynamics? I will present our theoreti cal effort to quantify – and mitigate – the influence of microscopic v iolations of gauge symmetry [1] as well as the first quantum simulation ex periment that measured the fulfillment of Gauss’s law [2]. Through these discussions\, I will aim at outlining a roadmap towards mature and practi cally relevant quantum simulation of gauge theories.\n[1] Jad C. Halimeh\, Philipp Hauke\, Reliability of lattice gauge theories\, arXiv:2001.00024 [cond-mat.quant-gas] (2020)\, Staircase prethermalization and constrained dynamics in lattice gauge theories\, arXiv:2004.07248 [cond-mat.quant-gas] (2020)\, Origin of staircase prethermalization in lattice gauge theories\ , arXiv:2004.07254 [cond-mat.str-el] (2020)\, Jad C. Halimeh\, Robert Ott\ , Ian P. McCulloch\, Bing Yang\, Philipp Hauke\, Robustness of gauge-invar iant dynamics in ultracold-atom gauge theories\, arXiv:2005.10249 [cond-ma t.quant-gas].\n[2] Bing Yang\, Hui Sun\, Robert Ott\, Han-Yi Wang\, Torste n V. Zache\, Jad C. Halimeh\, Zhen-Sheng Yuan\, Philipp Hauke\, Jian-Wei P an\, Observation of gauge invariance in a 71-site quantum simulator\, arXi v:2003.08945 [cond-mat.quant-gas] (2020).\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Erez Zohar (Racah Institute of Physics) DTSTART:20200723T133000Z DTEND:20200723T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/6 DESCRIPTION:Title: Absorbing fermionic statistics by lattice gauge fields and eliminati ng fermions\nby Erez Zohar (Racah Institute of Physics) as part of HEP -tensor network seminars\n\n\nAbstract\nFermionic statistics include the p arity superselection rule\, having to do with the global Z_2 (parity) symm etry of fermionic Hamiltonians. In lattice theories\, this symmetry can be gauged and made local\, with "parity Gauss laws" relating the local fermi onic parity on each site with the divergence of parity gauge fields around it. These local constraints allow one to transfer the statistics from the fermionic matter to the gauge field. Lattice gauge theories\, whose gauge group contains a normal Z_2 subgroup\, offer this possibility without int roducing any extra ingredients. I will discuss a transformation we have re cently derived\, which maps lattice gauge theories with fermionic matter t o equivalent theories with hardcore bosonic matter. In the resulting model s\, the interaction of the matter with the gauge fields is slightly change d\, but in a local way. Unlike in the Jordan-Wigner procedure\, this mappi ng gives rise to no nonlocality and can be performed in arbitrary space di mensions. Furthermore\, it can be extended to models without any gauge fie ld\, by the introduction of an auxiliary\, non-dynamical Z_2 field which w ill absorb the statistics.\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Laurens Lootens (University of Ghent) DTSTART:20200924T133000Z DTEND:20200924T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/7 DESCRIPTION:Title: Matrix product operator symmetries and intertwiners for topological and critical lattice models\nby Laurens Lootens (University of Ghent) as part of HEP-tensor network seminars\n\n\nAbstract\nProjected entangled pair state (PEPS) descriptions of (2+1)d topologically ordered states are characterized by non-local matrix product operator (MPO) symmetries on the entanglement degrees of freedom of the PEPS tensors. Various explicit ten sor network representations and their symmetries have been known for a lon g time\, examples being G-injective and string-net PEPS. In this talk\, ba sed on our recent work (arXiv:2008.11187)\, I will synthesize and generali ze these results by showing that the consistency conditions for MPO symmet ries amount to the defining equations of a bimodule category\, thereby sho wing that the classification of these PEPS and MPO symmetries amounts to t he classification of the data of a bimodule category. Different PEPS repre sentations of the same state can be related by an MPO intertwiner\, which can be thought of as a generalized gauge transformation on the virtual lev el\, providing an important step towards a general fundamental theorem of PEPS. Additionally\, these new PEPS representations allow us to construct tensor network representations of domain walls between different topologic al phases. Finally\, all these results have an immediate application to cr itical lattice models described by CFT\, and I will illustrate this by giv ing an example of orbifolding or simple current extension on the lattice.\ n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Jutho Haegeman (University of Ghent) DTSTART:20201008T133000Z DTEND:20201008T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/8 DESCRIPTION:Title: Lattice regularization and entanglement structure of the Gross Neveu model\nby Jutho Haegeman (University of Ghent) as part of HEP-tensor network seminars\n\n\nAbstract\nWe construct a Hamiltonian lattice regular isation of the N-flavour Gross-Neveu model that manifestly respects the fu ll O(2N) symmetry\, preventing the appearance of any unwanted marginal per turbations to the quantum field theory. In the context of this lattice mod el\, the dynamical mass generation is intimately related to the Coleman-Me rmin-Wagner and Lieb-Schultz-Mattis theorem. In particular\, the model can be interpreted as lying at the first-order phase transition line between a trivial and symmetry-protected topological (SPT) phase\, which explains the degeneracy of the elementary kink excitations. We show that our Hamilt onian model can be solved analytically in the large N limit\, producing th e correct expression for the mass gap. Furthermore\, we perform extensive numerical matrix product state simulations for N=2\, thereby recovering th e emergent Lorentz symmetry and the proper non-perturbative mass gap scali ng in the continuum limit. Finally\, our simulations also reveal how the c ontinuum limit manifests itself in the entanglement spectrum. As expected from conformal field theory we find two conformal towers\, one tower spann ed by the linear representations of O(4)\, corresponding to the trivial ph ase\, and the other by the projective i.e. spinor representations\, corres ponding to the SPT phase.\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Johannes Knaute (Albert Einstein Institute\, Potsdam) DTSTART:20201022T133000Z DTEND:20201022T143000Z DTSTAMP:20260404T111326Z UID:HEP-TN/9 DESCRIPTION:Title: From spin chains to real-time thermal field theory using tensor netw orks\nby Johannes Knaute (Albert Einstein Institute\, Potsdam) as part of HEP-tensor network seminars\n\n\nAbstract\nOne of the most interesting directions in theoretical high-energy and condensed-matter physics is und erstanding dynamical properties of collective states of quantum field theo ries. The most elementary tool in this quest is retarded equilibrium corre lators governing the linear response theory. In this talk\, I will describ e how tensor networks can be used to determine retarded correlators in an ab initio way for a class of (1 + 1)-dimensional quantum field theories th at arise as infrared descriptions of quantum Ising chains. I will show tha t\, complemented with signal analysis using the Prony method\, tensor netw ork calculations for intermediate times provide a powerful way to explore the structure of singularities of the correlator in the complex frequency plane and to make predictions about the thermal response to perturbations in a class of nonintegrable interacting quantum field theories. The talk i s based on arXiv:1912.08836. Time permitting\, I will also mention some fo llow-up directions emerging from this line of research.\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Tobias Osborne (University of Hannover) DTSTART:20210422T130000Z DTEND:20210422T140000Z DTSTAMP:20260404T111326Z UID:HEP-TN/10 DESCRIPTION:Title: Holographic networks for 1+1 de Sitter spacetimes\nby Tobias Os borne (University of Hannover) as part of HEP-tensor network seminars\n\n\ nAbstract\nHolographic tensor networks associated to tilings of (1+1)-dime nsional de Sitter spacetime are introduced. Basic features of these networ ks are discussed\, compared\, and contrasted with conjectured properties o f quantum gravity in de Sitter spacetime. Notably\, a correspondence betwe en the quantum information capacity of the network and the cosmological co nstant will be highlighted.\n LOCATION:https://stable.researchseminars.org/talk/HEP-TN/10/ END:VEVENT END:VCALENDAR