Propriedades estatísticas de fótons de micro-ondas gerados por uma junção túnel

• Ano de defesa: 2022
• Autor(a) principal: Campos, Maikon Bruno Alves
• Orientador(a): Mendes, Udson Cabral
• Banca de defesa: Mendes, Udson Cabral, Almeida, Norton Gomes de, Silva, Cláudio José da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Fisica (IF)
• Departamento: Instituto de Física - IF (RMG)
• País: Brasil
• Palavras-chave em Português: Equação mestra; Número de fótons; Operador anômalo; Estado comprimido; Quadratura
• Palavras-chave em Inglês: Master equation; Number of photons; Anomalous correlator; Squeezed state; Quadrature
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERAL
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/12509

In this dissertation, we investigate the statistical properties of microwave photons generated by a tunnel junction coupled to a microwave resonator. For that, we developed the master equation formalism to calculate the statistical properties of (i) an electromagnetic field mode coupled to a thermal reservoir and (ii) to a squeezed vacuum reservoir. Furthermore, we derived the Hamiltonian of the tunnel junction coupled to a microwave resonator. This allows us to derive the master equation for the tunnel junction coupled to a microwave resonator and Confirm that (i) in the absence of ac voltage, the junction behaves as a thermal reservoir and (ii) in the presence of an ac voltage oscillating at a frequency equal to twice the frequency of the resonator, the junction behaves as a squeezed reservoir. Also we studied the tunnel junction coupled to a microwave resonator subjected to ac voltage with a frequency equal to three times the resonator frequency, theoretically demonstrating the possibility of generating photon trios, which has already been explored experimentally, but which has yet to be has no theoretical explanation for these experiments.