Seminar: Dynamical and statics interference effects in photonic lattices

Pedro Orellana Universidad Técnica Federico Santa María (Chile)

Date: 17/12/2024

Time: 13:00 h

Place: Aula V Trilingüe, Facultad de Ciencias, Universidad de Salamanca

In this seminar, we will analyze some interference effects due to side-attached structures in onedimensional photonic lattices. We will examine the dynamic and static properties of Fano resonances and bound states in the continuum in these systems [1-2].

References

[1] E. Miroshnichenko, S. Flach, and Y. S. Kivshar, Fano resonances in nanoscale structures, Rev.

Mod. Phys. 82, 2257 (2010)

[2] C. Hsu, B. Zhen, and A. e. a. Stone, Nat. Rev. Mater.1, 16048 (2016)

III Colloquium IUFFyM 2024/2025 

Taming gauge symmetry with quantum computers

Alejandro Bermúdez Carballo Instituto de Física Teórica, CSIC-UAM

Date: December 12th, 2024

Time: 13:00 h

Place: Aula I Trilingüe, Facultad de Ciencias, Universidad de Salamanca

The notion of gauge symmetry underlies our most accurate descriptions of the fundamental laws of Nature. In contrast to global symmetries, which transform quantum states in a prescribed manner and can be spontaneously broken leading to the variety of states of matter that surround us, gauge symmetry is often referred to as a ‘do-noting transformation’. Indeed, it acts trivially on physical quantum states, and is thus understood as some sort of redundancy as only gauge-invariant observable es can display a non-vanishing expectation value. In this talk, I will discuss recent progress in the field of quantum computation and quantum simulation that is progressively allowing to synthesize lattice field theories (sLFTs) in several laboratories worldwide. In this experiments, gauge symmetry is not a redundancy but rather an emergent approximate symmetry acting non-trivially on the whole Hilbert space of the system. I will show how one can use these quantum devices to explore problems such as confinement by designing the effective dimensionality and the gauge group of these sLFTs, and point to future exciting directions in which open problems in the field, revolving around the finite-density phases of quark matter or real-time non-equilibrium phenomena, could be addressed with these quantum devices.