Browsing Centro de Óptica e Información Cuántica (CQOQI) by Title
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A method to deconvolve stellar profiles The nonrotating line utilizing Gaussian sum approximation
(EDP SCIENCES S A, 20230804)Context. Currently, one of the standard procedures used to determine stellar and wind parameters of massive stars involves to comparing the observed spectral lines with a grid of synthetic lines. These synthetic lines are ... 
Bayesian sampling with BeAtlas, a grid of synthetic Be star spectra I. Recovering the fundamental parameters of α Eri and β CMi
(Oxford University Press, 202309)Classical B emission (Be) stars are fast rotating, nearmainsequence Btype stars. The rotation and the presence of circumstellar discs profoundly modify the observables of active Be stars. Our goal is to infer stellar ... 
Breaking the optomechanical cooling limit by two drive fields on a membraneinthemiddle system
(AMER PHYSICAL SOC, 2019)We present a theoretical scheme for groundstate cooling of a mechanical resonator in a membraneinthemiddle optomechanical system (OMS) driven by two reddetuned drive fields. The details of dynamical evolution of OMS ... 
Coherence as a measure for nonMarkovianity and its applications to color centers in diamond
(American Physical Society, 20190430)The degree of nonMarkovianity of a continuous bath can be quantified by means of the coherence. This simple measure is experimentally accessible through Ramsey spectroscopy, but it is limited to incoherent dynamical maps. ... 
Coherent population trapping with a controlled dissipation: applications in optical metrology
(IOP PUBLISHING LTD, 2018)We analyze the properties of a pulsed coherent population trapping protocol that uses a controlled decay from the excited state in a Lambdalevel scheme. We study this problem analytically and numerically and find regimes ... 
Control of interference and diffraction of a threelevel atom in a doubleslit scheme with cavity fields
(American Physical Society, 20200928)A doublecavity with a quantum mechanical and a classical field is placed immediately behind a doubleslit in order to analyze the waveparticle duality. Both fields have common nodes and antinodes through which a threelevel ... 
Controlling parameters of the waveparticle duality of a twolevel atom in a doubleslit scheme with cavity field
(The Optical Society, 202101)A doubleslit scheme placed immediately before a standing wave allows one to establish two possible paths for the passage of an atom. Each path matches with a node or antinode of the wave. The atom–field interaction is ... 
Effects of gain saturation on the quantum properties of light in a nonHermitian gainloss coupler
(AMER PHYSICAL SOC, 2019)Gain saturation is ubiquitous but has not been fully explored in the newly developed field of nonHermitian optics. On the other hand, the nonclassical properties of light are highly relevant to the gain saturation that ... 
Efficient ground state cooling of a membrane by the combination of continuouswave field and pulses
(IOP Publishing Ltd, 20210528)We present an approach that realizes the ground state cooling of the membraneinmiddle optomechanical system. Instead of straightforwardly using the continuouswave (CW) or pulsed external drives, we consider the combinations ... 
Entangling Two Macroscopic Mechanical Resonators at High Temperature
(AMER PHYSICAL SOC, 2020)At high temperature, thermal decoherence dominates so that the entanglement of quantum states is difficult to preserve. Realizing hightemperature entanglement is, therefore, a challenge to the current quantum technologies. ... 
Experimental quantum tomography assisted by multiply symmetric states in higher dimensions
(AMER PHYSICAL SOC, 2019)Highdimensional quantum information processing has become a mature field of research with several different approaches being adopted for the encoding of Ddimensional quantum systems. Such progress has fueled the search ... 
Fisher Information, Weak Values and Correlated Noise in Interferometry
(Cornell University, 20190225)In this article we present an experimental proposal for quantum enhanced estimation of optomechanical parameters. The precision of the estimation is improved by using the technique of weak value amplification, which can ... 
Groundstate cooling of a nanomechanical oscillator with N spins
(AMER PHYSICAL SOC, 2018)It is typical of modern quantum technologies employing nanomechanical oscillators to demand few mechanical quantum excitations, for instance, to prolong coherence times of a particular task or to engineer a specific ... 
Highly efficient cooling of mechanical resonator with square pulse drives
(OPTICAL SOC AMER, 2018)Ground state cooling of mechanical resonator is a way to generate macroscopic quantum states. Here we present a study of optomechanical cooling under the drive of square pulses without smooth profile. By illustrating the ... 
Influence of squeezing on the weaktostrong measurement transition
(AMER PHYSICAL SOC, 20210611)In this work, we study the measurement transition for a coherent squeezed pointer state through a transition factor Gamma that involves a systempointer coupling by using an arbitrary measured observable A. In addition, ... 
Macroscopic nonclassicalstate preparation via postselection
(American Physical Society, 2017)Macroscopic quantum superposition states are fundamental to test the classicalquantum boundary and present suitable candidates for quantum technologies. Although the preparation of such states has already been realized, ... 
Mechanical oscillations frozen on discrete levels by two optical driving fields
(American Physical Society, 20200720)We report a synchronization phenomenon which is simulated with an optomechanical system driven by two equally strong fields with different frequencies. Once the frequencies of the driving fields are properly matched, the ... 
Mutual Information and Quantum Discord in Quantum State Discrimination with a Fixed Rate of Inconclusive Outcomes
(MDPI Multidisciplinary Digital Publishing Institute, 2021016)We studied the mutual information and quantum discord that Alice and Bob share when Bob implements a discrimination with a fixed rate of inconclusive outcomes (FRIO) onto two pure nonorthogonal quantum states, generated ... 
Mutual Information and Quantum Discord in Quantum State Discrimination with a Fixed Rate of Inconclusive Outcomes
(MDPI, 202101)We studied the mutual information and quantum discord that Alice and Bob share when Bob implements a discrimination with a fixed rate of inconclusive outcomes (FRIO) onto two pure nonorthogonal quantum states, generated ... 
Nonlinear optomechanical resonance entering a selforganized energy transfer pattern
(Chaos, Solitons and Fractals, 202308)The energy transfer between different subsystems or different vibration modes is always one of the most interested problems in the study of the resonance phenomena in coupled nonlinear dynamical systems. With an optomechanical ...