THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Luz Quântica e Luz Estruturada

Paulo Henrique Souto Ribeiro

GIQSUL – Departamento de Física Universidade Federal de Santa Catarina

Abstract:

No dia 16 de maio se comemora o dia internacional da luz. A luz é um objeto físico da maior relevância e a compreensão da sua natureza, ou seja, do que é feita, como é produzida, como se propaga e como interage com os outros objetos, vem intrigando a humanidade há muitos séculos. Nesta palestra, eu falarei de eventos históricos relacionados ao avanço do conhecimento da luz, até fazer a conexão com o trabalho atual do Laboratório de Óptica Quântica da UFSC empregando luz estruturada.

Date: May 20, 2022 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/RINm1Em1-GQ

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Quantum Darwinism and the spreading of classical information in non-classical theories

Dr. Roberto Dobal Baldijão

Unicamp

Abstract:

Quantum Darwinism helps us to understand how our world ends up looking classical, besides being non-classical in nature. It posits that such emergence of a classical reality relies on the spreading of classical information from a quantum system to many parts of its environment. But what are the essential physical principles of quantum theory that make this mechanism possible? We address this question by formulating the simplest instance of Darwinism — CNOT-like fan-out interactions – in a class of probabilistic theories that contain classical and quantum theory as special cases. We determine necessary and sufficient conditions for any theory to admit such interactions. We find that every theory with non-classical features that admits this idealized spreading of classical information must have both entangled states and entangled measurements. Furthermore, we show that Spekkens’ toy theory admits this form of Darwinism, and so do all probabilistic theories that satisfy principles like strong symmetry, or contain a certain type of decoherence processes. Our result suggests the counter-intuitive general principle that in the presence of local non-classicality, a classical world can only emerge if this non-classicality can be “amplified” to a form of entanglement.

Date: May 13, 2022 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/Ao09HVXxYP8

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Delta Baryons in Magnetized Neutron-Star Matter

Kauan Dalfovo Marquez

UFSC/FSC

Abstract:

Strong magnetic fields, such the ones expected to occur in the interior of neutron stars, can modify the microscopic composition of baryonic matter. In this work, we study magnetic field effects on neutron star matter containing the baryon octet and additional heavier spin-3/2 baryons (the deltas). We make use of different relativistic models for the equation of state of dense matter under the influence of strong magnetic fields, also considering the effects of the anomalous magnetic moment of leptons and baryons. We find that a strong magnetic field enhances the delta-baryon population in dense matter, while decreasing the relative density of hyperons. Astrophysical implications are drawn from the assumption that magnetic neutron stars are likely to contain delta-baryons in their interior.

Date: May 06, 2022 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/pbRzT9CpcYg