Banca de DEFESA: Celso Alves do Nascimento Júnior

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Celso Alves do Nascimento Júnior
DATE: 16/01/2023
TIME: 14:00
LOCAL: Auditório da Física
TITLE:

Entanglement of Valley Excitonic Qubits in the New Two-Dimensional Systems Integrated into a Nanocavity

KEY WORDS:

Qubit-Excitons. Entanglement. Concurrence. Quantum Computing.

PAGES: 97
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

In this work, the qubit-excitonic dynamics in three different quantum systems will be analyzed which will allow us to extract various relevant information, such as the concurrence, which it is the means by which it is possible to calculate how entangled a quantum system is. First we study the open quantum system composed by two valleys populated by bright excitons, where it was shown that competition as a function of time always decays, that is, it always reached zero steady states. In the second study, we introduced to the first system a bimodal microcavity, where two initial states di- ferents: The first with the qubit-excitons in an uncorrelated state (non-correlated state). entangled) and the cavity photons in a Bell state (maximally entangled state). in the second initial state, we leave the qubit-excitons in a Bell state and the cavity photons in an uncorrelated state. Calculations were then carried out post-dynamics, such as the separation of the density matrices of the composite system, and finally we calculated the concurrence for the excitonic system. This analysis showed that the concurrence presented satisfactory stationary values for its use in Computing Quantum, showing that the cavity introduced to the system benefited entanglement of qubit-excitons. In the third, we worked with a system of three levels located in a single valley, populated by bright and dark qubit-excitons, where the objective was to find analytical stationary solutions, as well as comparing the equations of motion obtained through the Linblad Master Equation with the equations obtained using the formalism of the rate equations.

BANKING MEMBERS:
Externo à Instituição - ANDRÉ JORGE CARVALHO CHAVES - ITA
Externo à Instituição - MARCOS RAFAEL GUASSI - UNICEUB
Interno - 3272139 - ALEXANDRE CAVALHEIRO DIAS
Presidente - 407633 - DAVID LIMA AZEVEDO