13 citations · 49 across the 8 of their papers we have counts for
8 papers
An introduction to quantum measurements with a historical motivation
Leonardo Andreta de Castro, Olímpio Pereira de Sá Neto, Carlos Alexandre Brasil
We provide an introduction to the theory of quantum measurements that is centered on the pivotal role played by John von Neumann's model. This introduction is accessible to student…
Weak values in collision theory
Leonardo Andreta de Castro, Carlos Alexandre Brasil, Reginaldo de Jesus Napolitano
Weak measurements have an increasing number of applications in contemporary quantum mechanics. They were originally described as a weak interaction that slightly entangled the tran…
Elliptical orbits in the phase-space quantization
Leonardo Andreta de Castro, Carlos Alexandre Brasil, Reginaldo de Jesus Napolitano
The energy levels of hydrogen-like atoms are obtained from the phase-space quantization, one of the pillars of the old quantum theory, by three different methods - (i) direct integ…
Understanding the Pointer States
Carlos Alexandre Brasil, Leonardo Andreta de Castro
In quantum mechanics, pointer states are eigenstates of the observable of the measurement apparatus that represent the possible positions of the display pointer of the equipment. T…
Efficient finite-time measurements under thermal regimes
Carlos Alexandre Brasil, Leonardo Andreta de Castro, Reginaldo de Jesus Napolitano
Contrary to conventional quantum mechanics, which treats measurement as instantaneous, here we explore a model for finite-time measurement. The main two-level system interacts with…
Error correction in short time steps during the application of quantum gates
Leonardo Andreta de Castro, Reginaldo de Jesus Napolitano
We propose a method for applying the quantum error-correction method for errors that occur during quantum gates. Using a perturbation treatment of the noise that allows us to separ…
How much time does a measurement take?
Carlos Alexandre Brasil, Leonardo Andreta de Castro, Reginaldo de Jesus Napolitano
We consider the problem of measurement using the Lindblad equation, which allows the introduction of time in the interaction between the measured system and the measurement apparat…
Protecting a quantum state from environmental noise by an incompatible finite-time measurement
Carlos Alexandre Brasil, Leonardo Andreta de Castro, Reginaldo de Jesus Napolitano
We show that measurements of finite duration performed on an open two-state system can protect the initial state from a phase-noisy environment, provided the measured observable do…