Continuous Quantum Error Correction Through Local Operations

We propose local strategies to protect global quantum information. The protocols, which are quantum error correcting codes for dissipative systems, are based on environment measurements, direct feedback control and simple encoding of the logical qubits into physical qutrits whose decaying transitions are indistinguishable and equally probable. The simple addition of one extra level in the description of the subsystems allows for local actions to fully and deterministically protect global resources, such as entanglement. We present codes for both quantum jump and quantum state diffusion measurement strategies and test them against several sources of inefficiency. The use of qutrits in information protocols suggests further characterization of qutrit-qutrit disentanglement dynamics, which we also give together with simple local environment measurement schemes able to prevent distillability sudden death and even enhance entanglement in situations in which our feedback error correction is not possible.Comment: Accepted for publication in Phys. Rev.

Protocolos de descelularização da polpa dentária

The aim of the present study was to review the literature about the existing decellularization protocols to obtain a scaffold through the extracellular matrix (ECM) of the dental pulp. Decellularization is a process that aims to transform an organ or tissue into a scaffold to receive new cells and initiate a regenerative process. It can be performed with agents and/or methods used alone or in combination, with the aim of achieving a scaffold with a smaller number of cells, including DNA and immune cells, in addition to preserving essential components and structures of the ECM. A search was carried out for scientific articles in the Pubmed database, within the period from 2008 to 2022, on dental pulp and its decellularization protocols. The reviewed literature made it possible to conclude that there are several protocols that use different agents and methods in different concentrations and time, but succeeding in terms of their respective efficiencies. However, they also highlighted the absence of a standardized protocol and the need for it, in addition to the difficulties imposed by the clinical reality.O objetivo do presente estudo foi revisar a literatura acerca dos protocolos de descelularização existentes para obter um scaffold através da matriz extracelular (MEC) da polpa dentária. A descelularização consiste em um processo que visa transformar um órgão ou tecido em um arcabouço para receber novas células e iniciar um processo regenerativo. Este pode ser realizado com agentes e/ou métodos usados de forma isolada ou combinada, tendo o propósito de alcançar um scaffold com menor número de células, incluindo DNA e células imunológicas, além da preservação de componentes e estruturas essenciais da MEC. Foi realizada uma busca de artigos científicos na base de dados Pubmed, dentro do período de 2008 a 2022, sobre polpa dentária e seus protocolos de descelularização. A literatura revisada possibilitou concluir que há diversos protocolos que utilizam de diferentes agentes e métodos em variadas concentrações e tempo, além de evidenciar suas respectivas eficácias. Mas, destacaram também a ausência de um protocolo padronizado e a necessidade do mesmo, além das dificuldades impostas pela realidade clínica