Histograma de quadratura em tomografia de estado quântico de máxima verossimilhança

• Ano de defesa: 2018
• Autor(a) principal: Silva, José Leonardo Esteves da
• Orientador(a): Vasconcelos, Hilma Helena Macedo de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Teleinformática; Tomografia; Vácuo; Quantum state tomography; Histogram.; Cat states; Squeezed vacuum states; Fock states
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/49531

Quantum state tomography aims to determine the quantum state of a system from measured data and is an essential tool for quantum information science. When dealing with continuous variable quantum states of light, tomography is often done by measuring the field amplitudes at different optical phases using homodyne detection. The quadrature-phase homodyne measurement outputs a continuous variable, so to reduce the computational cost of tomography, researchers often discretize the measurements. We show that this can be done without significantly degrading the fidelity between the estimated state and the true state. In this thesis, we study different strategies for determining the histogram bin widths. We show that computation time can be significantly reduced with little loss in the fidelity of the estimated state when the measurement operators corresponding to each histogram bin are integrated over the bin width.