50 citations · 295 across the 19 of their papers we have counts for
19 papers · 1 filter
Multiparameter estimation with position-momentum correlated Gaussian probes
João C. P. Porto, Carlos H. S. Vieira, Pedro R. Dieguez +2
Gaussian quantum probes have been widely used in quantum metrology and thermometry, where the goal is to estimate the temperature of an environment with which the probe interacts.…
Temperature and non-Markovian parameter estimation in quantum Brownian motion
João C. P. Porto, Carlos H. S. Vieira, Irismar G. da Paz +2
We investigate a quantum metrological protocol operating in a non-Markovian environment by employing the quantum Brownian motion (QBM) model, in which the system is linearly couple…
Enhancing Gaussian quantum metrology with position-momentum correlations
João C. P. Porto, Lucas S. Marinho, Pedro R. Dieguez +2
Quantum metrology offers significant improvements in several quantum technologies. In this work, we propose a Gaussian quantum metrology protocol assisted by initial position-momen…
Quantum switch instabilities with an open control
Otavio A. D. Molitor, André H. A. Malavazi, Roberto Dobal Baldijão +3
The superposition of causal order shows promise in various quantum technologies. However, the fragility of quantum systems arising from environmental interactions, leading to dissi…
Gouy phase and quantum interference with cross-Wigner functions for matter-waves
Lucas S. Marinho, Pedro R. Dieguez, Carlos H. S. Vieira +1
The Gouy phase is essential for accurately describing various wave phenomena, ranging from classical electromagnetic waves to matter waves and quantum optics. In this work, we empl…
Unveiling quantum complementarity tradeoffs in relativistic scenarios
Marcos L. W. Basso, Ismael L. Paiva, Pedro R. Dieguez
Complementarity plays a pivotal role in understanding a diverse range of quantum phenomena. Here, we show how the tradeoff between quantities of a complete complementarity relation…
High-dimensional monitoring and the emergence of realism via multiple observers
Alexandre C. Orthey, Pedro R. Dieguez, Owidiusz Makuta +1
Correlation is the basic mechanism of every measurement model, as one never accesses the measured system directly. Instead, correlations are created, codifying information about th…
Exploring quantum thermodynamics with NMR
Carlos H. S. Vieira, Jefferson L. D. de Oliveira, Jonas F. G. Santos +2
Quantum thermodynamics seeks to extend non-equilibrium stochastic thermodynamics to small quantum systems where non-classical features are essential to its description. Such a rese…
Coherence and realism in the Aharonov-Bohm effect
Ismael L. Paiva, Pedro R. Dieguez, Renato M. Angelo +1
The Aharonov-Bohm effect is a fundamental topological phenomenon with a wide range of applications. It consists of a charge encircling a region with a magnetic flux in a superposit…
Thermal devices powered by generalized measurements with indefinite causal order
Pedro R. Dieguez, Vinicius F. Lisboa, Roberto M. Serra
A quantum-controlled device may produce a scenario in which two general quantum operations can be performed in such a way that it is not possible to associate a definite order for…
Experimental investigation of a quantum heat engine powered by generalized measurements
V. F. Lisboa, P. R. Dieguez, J. R. Guimarães +2
Generalized measurements may allow the control of its back-action on the quantum system by interpolating from a very weak to strong projective action. Such a measurement can fuel a…
Realism-based nonlocality: Invariance under local unitary operations and asymptotic decay for thermal correlated states
V. S. Gomes, P. R. Dieguez, H. M. Vasconcelos
The realism-based nonlocality (RBN) is a recently introduced measure that differs from the well-known Bell's nonlocality. For bipartite states, the RBN concerns how much an element…
Experimental assessment of physical realism in a quantum-controlled device
Pedro R. Dieguez, Jéferson R. Guimarães, John P. S. Peterson +2
Bohr's complementarity principle has been challenged by quantum delayed-choice experiments wherein quantum systems are claimed to behave neither as wave nor as a particle, but in a…
Irrealism from fringe visibility in matter-wave double-slit interference with initial contractive states
F. R. Lustosa, P. R. Dieguez, I. G. da Paz
The elements of reality coined by Einstein, Podoslky, and Rosen promoted a series of fundamental discussions involving the notion of quantum correlations and physical realism. The…
Negativity-Mutual Information conversion and coherence in two-coupled harmonic oscillators
Jonas F. G. Santos, Carlos H. S. Vieira, Pedro R. Dieguez
Quantum information is a common topic of research in many areas of quantum physics, such as quantum communication and quantum computation, as well as quantum thermodynamics. It can…
Weak quantum discord
P. R. Dieguez, R. M. Angelo
Originally introduced as the difference between two possible forms of quantum mutual information, quantum discord has posteriorly been shown to admit a formulation according to whi…
Information-reality complementarity: The role of measurements and quantum reference frames
P. R. Dieguez, R. M. Angelo
Recently, a measure has been put forward which allows for the quantification of the degree of reality of an observable for a given preparation [A. L. O. Bilobran and R. M. Angelo,…
Geometry of the adiabatic theorem
A. C. Lobo, R. A. Ribeiro, P. R. Dieguez +1
We present a simple and pedagogical derivation of the quantum adiabatic theorem for two level systems (a single qubit) based on geometrical structures of quantum mechanics develope…
Proper and improper density matrices and the consistency of the Deutsch model for Local Closed Timelike Curves
A. C. Lobo, I. L. Paiva, P. R. Dieguez
We discuss the concept of proper and improper density matrixes and we argue that this issue is of fundamental importance for the understanding of the quantum-mechanical CTC model p…