289 citations · 875 across the 24 of their papers we have counts for
24 papers
When Isolated Quantum Systems Appear Classical
Thiago R. de Oliveira, Pedro S. Correia, Tiago Debarba +3
The emergence of classical behavior and the origin of thermal equilibrium are two central problems in the foundations of physics. In the standard accounts, both phenomena are typic…
Canonical typicality under general quantum channels
Pedro S. Correia, Gabriel Dias Carvalho, Thiago R. de Oliveira +2
With the control of ever more complex quantum systems becoming a reality, new scenarios are emerging where generalizations of the most foundational aspects of statistical quantum m…
Majorization-based benchmark of the complexity of quantum processors
Alexandre B. Tacla, Nina Machado O'Neill, Gabriel G. Carlo +2
Here we investigate the use of the majorization-based indicator introduced in [R. O. Vallejos, F. de Melo, and G. G. Carlo, Phys. Rev. A 104, 012602 (2021)] as a way to benchmark t…
Quantum state inference from coarse-grained descriptions: analysis and an application to quantum thermodynamics
Raúl O. Vallejos, Pedro Silva Correia, Paola Concha Obando +3
The characterization of physical systems relies on the observable properties which are measured, and how such measurements are performed. Here we analyze two ways of assigning a de…
Approximating Invertible Maps by Recovery Channels: Optimality and an Application to Non-Markovian Dynamics
Lea Lautenbacher, Fernando de Melo, Nadja K. Bernardes
We investigate the problem of reversing quantum dynamics, specifically via optimal Petz recovery maps. We focus on typical decoherence channels, such as dephasing, depolarizing and…
The principle of majorization: application to random quantum circuits
Raul O. Vallejos, Fernando de Melo, Gabriel G. Carlo
We test the principle of majorization [J. I. Latorre and M. A. Martin-Delgado, Phys. Rev. A 66, 022305 (2002)] in random circuits. Three classes of circuits were considered: (i) un…
Macro-to-micro quantum mapping and the emergence of nonlinearity
Pedro Silva Correia, Paola Concha Obando, Raúl O. Vallejos +1
As a universal theory of physics, quantum mechanics must assign states to every level of description of a system -- from a full microscopic description, all the way up to an effect…
Entropic Uncertainty Relations and the Quantum-to-Classical transition
Isadora Veeren, Fernando de Melo
Our knowledge of quantum mechanics can satisfactorily describe simple, microscopic systems, but is yet to explain the macroscopic everyday phenomena we observe. Here we aim to shed…
Multiparticle quantum walk with a gas-like interaction
Pedro C. S. Costa, Fernando de Melo, Renato Portugal
We analyze the dynamics of multiparticle discrete-time quantum walk on the two-dimensional lattice, with an interaction inspired on a classical model for gas collision, called HPP…
Coarse Graining of Partitioned Cellular Automata
Pedro C. S. Costa, Fernando de Melo
Partitioned cellular automata are known to be an useful tool to simulate linear and nonlinear problems in physics, specially because they allow for a straightforward way to define…
Emerging dynamics arising from coarse-grained quantum systems
Cristhiano Duarte, Gabriel Dias Carvalho, Nadja K. Bernardes +1
The purpose of physics is to describe nature from elementary particles all the way up to cosmological objects like cluster of galaxies and black holes. Although a unified descripti…
Reliability of digitized quantum annealing and the decay of entanglement
John P. S. Peterson, Roberto S. Sarthour, Alexandre M. Souza +3
We performed a banged-digital-analog simulation of a quantum annealing protocol in a two-qubit Nuclear Magnetic Resonance (NMR) quantum computer. Our experimental simulation employ…
Quantum Information Processing by Weaving Quantum Talbot Carpets
Osvaldo Jiménez Farías, Fernando de Melo, Pérola Milman +1
Single photon interference due to passage through a periodic grating is considered in a novel proposal for processing D-dimensional quantum systems (quDits) encoded in the spatial…
Open-System Dynamics of Entanglement
Leandro Aolita, Fernando de Melo, Luiz Davidovich
One of the greatest challenges in quantum information processing is the coherent control over quantum systems with an ever increasing number of particles. Within this endeavor, the…
The Power of Noisy Fermionic Quantum Computation
Fernando de Melo, Piotr Ćwikliński, Barbara M. Terhal
We consider the realization of universal quantum computation through braiding of Majorana fermions supplemented by unprotected preparation of noisy ancillae. It has been shown by B…
Quantum statistical synchronization of non-interacting particles
Malte C. Tichy, Markus Tiersch, Fernando de Melo +2
A full treatment for the scattering of an arbitrary number of bosons through a Bell multiport beam splitter is presented that includes all possible output arrangements. Due to exch…
Matrices of fidelities for ensembles of quantum states and the Holevo quantity
Mark Fannes, Fernando de Melo, Wojciech Roga +1
The entropy of the Gram matrix of a joint purification of an ensemble of K mixed states yields an upper bound for the Holevo information Chi of the ensemble. In this work we combin…
Optimal teleportation with a noisy source
Bruno G. Taketani, Fernando de Melo, Ruynet L. de Matos Filho
We establish the optimal quantum teleportation protocol for the realistic scenario when both input state and quantum channel are afflicted by noise. In taking these effects into ac…
Noisy One-Way Quantum Computations: The Role of Correlations
Rafael Chaves, Fernando de Melo
A scheme to evaluate computation fidelities within the one-way model is developed and explored to understand the role of correlations in the quality of noisy quantum computations.…
Zero-Transmission Law for Multiport Beam Splitters
Malte Christopher Tichy, Markus Tiersch, Fernando de Melo +2
The Hong-Ou-Mandel effect is generalized to a configuration of n bosons prepared in the n input ports of a Bell multiport beam splitter. We derive a strict suppression law for most…
Efficient and coherent excitation transfer across disordered molecular networks
Torsten Scholak, Fernando de Melo, Thomas Wellens +2
We show that finite-size, disordered molecular networks can mediate highly efficient, coherent excitation transfer which is robust against ambient dephasing and associated with str…
Equation of motion for entanglement
Markus Tiersch, Fernando de Melo, Thomas Konrad +1
We review an evolution equation for quantum entanglement for 2x2 dimensional quantum systems, the smallest system that can exhibit entanglement, and extend it to higher dimensional…
Entanglement of Identical Particles and the Detection Process
Malte Christopher Tichy, Fernando de Melo, Marek Kuś +2
We introduce detector-level entanglement, a unified entanglement concept for identical particles that takes into account the possible deletion of many-particle which-way informatio…
Universality in open system entanglement dynamics
Markus Tiersch, Fernando de Melo, Andreas Buchleitner
We show that the entanglement evolution of an open quantum system is the same for the vast majority of initial pure states, in the limit of large Hilbert space dimensions.