464 citations · 619 across the 13 of their papers we have counts for
13 papers
Phase-retrieval from Bohm's equations
Carlos Alexandre Brasil, Miled Hassan Youssef Moussa, Reginaldo de Jesus Napolitano
We present an analytic method, based on the Bohmian equations for quantum mechanics, for approaching the phase-retrieval problem in the following formulation: By knowing the probab…
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…
Analysis of the Jun Ishiwara's "The universal meaning of the quantum of action"
Karla Pelogia, Carlos Alexandre Brasil
Here we present an analysis of the paper "Universelle Bedeutung des Wirkungsquantums" (The universal meaning of the quantum of action), published by Jun Ishiwara in German in the "…
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…
A simple derivation of the Lindblad equation
Carlos Alexandre Brasil, Felipe Fernandes Fanchini, Reginaldo de Jesus Napolitano
We present a derivation of the Lindblad equation - an important tool for the treatment of non-unitary evolutions - that is accessible to undergraduate students in physics or mathem…
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…
Quantum state tomography and quantum logical operations in a three qubits NMR quadrupolar system
A. G. Araujo-Ferreira, Carlos Alexandre Brasil, D. O. Soares-Pinto +3
In this work, we present an implementation of quantum logic gates and algorithms in a three effective qubits system, represented by a (I = 7/2) NMR quadrupolar nuclei. To implement…
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…
The master equation for the reduced open-system dynamics, including a Lindbladian description of finite-duration measurement
Carlos Alexandre Brasil, Reginaldo de Jesus Napolitano
We consider the problem of the measurement of a system occurring during a finite time interval, while environmentally-induced noise decreases the system-state coherence. We assume…
Non-Markovian Dynamics of Quantum Discord
F. F. Fanchini, T. Werlang, C. A. Brasil +2
We evaluate the quantum discord dynamics of two qubits in independent and common non-Markovian environments. We compare the dynamics of entanglement with that of quantum discord. F…