Instituto de Telecomunicações

Oct 28, 2024 | link.aps.org | Daigo Oue |Instituto de Telecomunicações |Instituto Técnico |J. B. Pendry

We investigate the frictional force arising from quantum fluctuations when two dissipative metallic plates are set in a shear motion. While early studies showed that the electromagnetic fields in the quantum friction setup reach nonequilibrium steady states, yielding a time-independent force, other works have demonstrated the failure to attain steady states, leading to instability and time-varying friction under sufficiently low-loss conditions.

Sep 3, 2024 | link.aps.org | Bruno Mera |Instituto de Telecomunicações |Departmento de Matemática |Instituto Técnico

Landau levels are the eigenstates of a charged particle in two dimensions under a magnetic field and are at the heart of the integer and fractional quantum Hall effects, which are two prototypical phenomena showing topological features. Following recent discoveries of fractional quantum Hall phases in van der Waals materials, there is a rapid progress in understanding of the precise condition under which the fractional quantum Hall phases can be stabilized.

Jul 14, 2024 | allevents.in | Instituto de Telecomunicações

About the event ETFA Special session: Industrial Cybersecurity Methods and Technologies In the scope of the 29th International Conference on Emerging Technologies and Factory Automation, the chairs Paulo Bartolomeu (IT - UA), Amjad Gawanmeh (UAE), and Stefano Marrone (University of Campania) invite submissions to the Special Session "Industrial Cybersecurity Methods and Technologies" (SS09). Topics: Security, safety, or privacy-enhancing technologies in industrial systems Modeling of...

Jun 20, 2024 | link.aps.org | Instituto Técnico |Instituto de Telecomunicações |Lorenzo Buffoni |Sagar Silva Pratapsi

Quantum computers are operated by external driving fields, such as lasers, microwaves, or transmission lines, that execute logical operations on multiqubit registers, leaving the system in a pure state. However, the drive and the logical system might become correlated in such a way that, after tracing out the degrees of freedom of the driving field, the output state will not be pure.

Jun 20, 2024 | link.aps.org | Instituto Técnico |Instituto de Telecomunicações |Tatiana G. Rappoport |Rodrigo P. Câmara

Photonic platforms invariant under parity (P), time-reversal (T), and duality (D) can support topological phases analogous to those found in time-reversal invariant Z2 electronic systems with conserved spin. Here, we demonstrate the resilience of the underlying spin Chern phases against non-Hermitian effects, notably material dissipation. We identify that non-Hermitian, PD-symmetric, and reciprocal photonic insulators fall into two topologically distinct classes.