Characterization of overparametrization in the simulation of realistic quantum systems

Quantum computing devices require exceptional control of their experimental parameters to prepare quantum states and simulate other quantum systems. Classical optimization procedures used to find such optimal control parameters, have further been shown in idealized settings to exhibit different regimes of learning. Of interest in this work is the overparameterization regime, where for systems with a sufficient number of parameters, global optima for prepared state and compiled unitary fidelities may potentially be reached exponentially quickly. Here, we study the robustness of overparameterization phenomena in the presence of experimental constraints on the controls, such as bounding or sharing parameters across operators, as well as in the presence of noise inherent to experimental setups. We observe that overparameterization phenomena are resilient in these realistic settings at short times, however fidelities decay to zero past a critical simulation duration due to accumulation of either quantum or classical noise. This critical depth is found to be logarithmic in the scale of noise, and optimal fidelities initially increase exponentially with depth, before decreasing polynomially with depth, and with noise. Our results demonstrate that parameterized ansatze can mitigate entropic effects from their environment, offering tantalizing opportunities for their application and experimental realization in near term quantum devices.Comment: 10+23 pages, 10 figure

Evolution of the oceanic lithosphere and shear wave travel time residuals from oceanic earthquakes

Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.Microfiche copy available in Archives and Science.Bibliography: leaves 51-58.by Jeremy D. Duschenes.M.S

Fórum cultural em Curitiba

Orientador: Paulo Cesar Braga PachecoMonografia (graduação) - Universidade Federal do Paraná, Setor de Tecnologia, Curso de Graduação em Arquitetura e UrbanismoInclui referênciasResumo : O presente trabalho tem como objetivo principal o embasamento para realização do projeto em Curitiba de edifício instituído por Fundação ou Associação do Terceiro setor. Tal edifício comportaria funções de exposição artística educação e produção cultural além de sediar a administração da entidade responsável pela organização de projetos culturais diversos. A legislação foi tomada como base para entender o funcionamento legal desse tipo de edifício enquanto estudos de casos correlatos propiciaram a formação de um programa de necessidades preliminar e apontaram para a necessidade do projeto possibilitar através de elementos arquitetônicos sua apropriação pela populaçãoAbstract : The main goal for this work was to support the design of a building maintained by an organization of the third sector. This building would hold functions such as art exhibition, cultural education and production and would also be the headquarters for the association’s administration. The study of respective laws was used as ground to understand the way such a building could work, while the research of similar projects patched the way to establish a program and also indicate the necessity of architectonic means to help the population perceive the space as their

TB1 Lab Report 2128446

Data for assignment at University of Bristol PSYC20006. TB1 lab report - 212844

TB1 Lab Report 2128446

Data for assignment at University of Bristol PSYC20006. TB1 lab report - 212844

Pavillon Henry F. Hall, Université Concordia, 1455 boulevard De Maisonneuve Ouest, Montréal, 1966

Photographie: Pierre-Richard Bisson, 1979.07.23Au premier plan: Chevet de l'église St. Andrew and St. Pau

Aspects of ocean bottom seismology

Available from British Library Lending Division - LD:D54398/85 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo