Quantum Technology Initiative Journal Club

Thursday 24 Apr 2025, 16:00 → 17:00 Europe/Zurich

513/R-070 - Openlab Space (CERN)

Michele Grossi (CERN)

Weekly Journal Club meetings organised in the framework of the CERN Quantum Technology Initiative (QTI) to present and discuss scientific papers in the field of quantum science and technology. The goal is to help researchers keep track of current findings and walk away with ideas for their own research. Some previous knowledge of quantum physics would be helpful, but is not required to follow the talks.

To propose a paper for discussion, contact: michele.grossi@cern.ch

16:00 → 17:00 CERN QTI Journal CLUB¶

Convener: Dr Michele Grossi (CERN)

16:00 Francesco Di Marcantonio (Bilbao)¶

TITLE: Tensor-Network Study of the Roughening Transition in (2 + 1)D lattice gauge theories

LINK: https://arxiv.org/pdf/2503.19027

ABSTRACT: Within the confined phase of (2+1)D lattice gauge theories a roughening transition arises between a weakly confined regime with floppy string excitations and a strongly confined regime with stiff string excitations. In this work, we use an infinite Density Matrix Renormalization Group (iDMRG) algorithm to quantitatively characterize the properties of confined strings. To this end, we stabilize the state with a string excitation by ‘t Hooft loop operators. While for zero gauge-matter coupling we can use bare ‘t Hooft loop operators to do so, for finite gauge-matter coupling we have to transform them to emergent ones, which we achieve with an adiabatic protocol. By analyzing the scaling of both a novel order parameter and the entanglement entropy, our
approach allows us to accurately determine the roughening transition, even at finite gauge-matter coupling.

Speaker: Mr Francesco Di Marcantonio (UPV/EHU University of the Basque Country (SP))