54 citations · 705 across the 51 of their papers we have counts for
51 papers
Fock-state filtering of squeezed states: enhanced nonclassicality and effects of a thermal bath
João Pedro Gonzalez de Oliveira, A. Vidiella-Barranco
The ability to tailor photon-number statistics is central to the generation and control of nonclassical states of light. Here, we investigate how Fock-state filtering of squeezed c…
Phase-space approach to cavity field dynamics in a squeezed thermal reservoir
E. P. Mattos, A. Vidiella-Barranco
Quantum systems, such as a single-mode cavity field coupled to a thermal bath, typically experience destructive effects due to interactions with their noisy environment. When the b…
Enhancing nonclassical properties of quantum states of light using linear optics
E. P. Mattos, A. Vidiella-Barranco
In this letter, we present a simple and versatile scheme for enhancing the nonclassical properties of light states using only linear optics and photodetectors. By combining a coher…
Parametrically driving a quantum oscillator into exceptionality
C. A. Downing, A. Vidiella-Barranco
The mathematical objects employed in physical theories do not always behave well. Einstein's theory of space and time allows for spacetime singularities and Van Hove singularities…
Two coupled qubits under the influence of a minimal, phase-sensitive environment
G. L. Deçordi, A. Vidiella-Barranco
In this work, we investigate the influence of a minimal, phase-sensitive environment on a system of two coupled qubits. The environment is constituted by a single-mode field initia…
Generation and transfer of entangled states between two connected microtoroidal cavities: analysis of different types of coupling
Emilio H. S. Sousa, A. Vidiella-Barranco, J. A. Roversi
We investigate the generation and transfer of entangled states between two coupled microtoroidal cavities considering two different types of couplings, namely i) via a bridge qubit…
Performance analysis of continuous-variable quantum key distribution using non-Gaussian states
L. S. Aguiar, L. F. M. Borelli, J. A. Roversi +1
In this study, we analyze the efficiency of a protocol with discrete modulation of continuous variable non-Gaussian states, the coherent states having one photon added and then one…
Generation of nonclassical states of light via truncation of mixed states
E. P. Mattos, A. Vidiella-Barranco
A possible way of generating nonclassical states of light, especially non-Gaussian states, is via the truncation of a given state in the Fock basis. In recent work, we presented an…
Quantum entanglement in a four-partite hybrid system containing three macroscopic subsystems
C. Corrêa, A. Vidiella-Barranco
The combination of different quantum systems may allow the exploration of the distinctive features of each system for the investigation of fundamental phenomena as well as for quan…
Quantum state truncation using an optical parametric amplifier and a beamsplitter
E. P. Mattos, A. Vidiella-Barranco
We present a scheme of quantum state truncation in the Fock basis (quantum scissors), based on the combined action of a nondegenerate optical parametric amplifier and a beamsplitte…
Evolution of the quantized field coupled to a thermal bath: a phase space approach
E. P. Mattos, A. Vidiella-Barranco
We present an alternative method for describing the evolution of a mode of the quantized electromagnetic field in contact with a finite temperature thermal bath. We use the expansi…
Sudden death of entanglement induced by a minimal thermal environment
G. L. Deçordi, A. Vidiella-Barranco
We study the dynamics of two interacting two-level systems (qubits) having one of them isolated and the other coupled to a single mode electromagnetic field in a thermal state. The…
Journeys from Quantum Optics to Quantum Technology
Stephen M. Barnett, Almut Beige, Artur Ekert +17
Sir Peter Knight is a pioneer in quantum optics which has now grown to an important branch of modern physics to study the foundations and applications of quantum physics. He is lea…
Quantum phase estimation using squeezed quasi-Bell states
Douglas Delgado de Souza, A. Vidiella-Barranco
In this paper we present a study of the quantum phase estimation problem employing continuous-variable, entangled squeezed coherent (quasi-Bell) states as probe states. We show tha…
Discontinuity of Straightening in Anti-holomorphic Dynamics: I
Hiroyuki Inou, Sabyasachi Mukherjee
It is well known that baby Mandelbrot sets are homeomorphic to the original one. We study baby Tricorns appearing in the Tricorn, which is the connectedness locus of quadratic anti…
Generation of hybrid entanglement between a mirror and a trapped ion
Clóvis Corrêa, A. Vidiella-Barranco
We present a scheme for cavity-assisted generation of hybrid entanglement between a moving mirror belonging to an optomechanical cavity and a single trapped ion located inside a se…
A simple model for a minimal environment: the two-atom Tavis-Cummings model revisited
G. L. Deçordi, A. Vidiella-Barranco
Individual quantum systems may be interacting with surrounding environments having a small number of degrees of freedom. It is therefore relevant to understand the extent to which…
Quantum Key Distribution using Continuous-variable non-Gaussian States
L. F. M. Borelli, L. S. Aguiar, J. A. Roversi +1
In this work we present a quantum key distribution protocol using continuous-variable non-Gaussian states, homodyne detection and post-selection. The employed signal states are the…
Dissipation-driven squeezed and sub-Poissonian mechanical states in quadratic optomechanical systems
T. Figueiredo Roque, A. Vidiella-Barranco
In this work we study an optomechanical system in which there is a purely quadratic optomechanical coupling between the optical and mechanical modes. The optical mode is pumped by…
Two coupled qubits interacting with a thermal bath: A comparative study of different models
G. L. Deçordi, A. Vidiella-Barranco
We investigate a system of two interacting qubits having one of them isolated and the other coupled to a thermal reservoir. We consider two different models of system-reservoir int…
Deviations from reversible dynamics in a qubit-oscillator system coupled to a very small environment
A. Vidiella-Barranco
In this contribution it is considered a simple and solvable model consisting of a qubit in interaction with an oscillator exposed to a very small "environment" (a second qubit). An…
Dynamics of atom-field entanglement in a bimodal cavity
G. L. Deçordi, A. Vidiella-Barranco
We investigate some aspects of the dynamics and entanglement of bipartite quantum system (atom-quantized field), coupled to a third ``external" subsystem (quantized field). We make…
Coherence properties of coupled optomechanical cavities
T. Figueiredo Roque, A. Vidiella-Barranco
In this work we investigate an optomechanical system consisting of two cavities coupled to the same mechanical resonator. We consider each cavity being weakly pumped as well as a s…
Dynamics of a superconducting qubit coupled to the quantized cavity field: a unitary transformation approach
Dagoberto S. Freitas, A. Vidiella-Barranco, J. A. Roversi
We present a novel approach for studying the dynamics of a superconducting qubit in a cavity. We succeed in linearizing the Hamiltonian through the application of an appropriate un…