Listar Centro de Óptica e Información Cuántica (CQOQI) por título
Mostrando ítems 8-27 de 33
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Effects of gain saturation on the quantum properties of light in a non-Hermitian gain-loss coupler
(AMER PHYSICAL SOC, 2019)Gain saturation is ubiquitous but has not been fully explored in the newly developed field of non-Hermitian 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 continuous-wave field and pulses
(IOP Publishing Ltd, 2021-05-28)We present an approach that realizes the ground state cooling of the membrane-in-middle optomechanical system. Instead of straightforwardly using the continuous-wave (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 high-temperature 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)High-dimensional quantum information processing has become a mature field of research with several different approaches being adopted for the encoding of D-dimensional quantum systems. Such progress has fueled the search ... -
Fisher Information, Weak Values and Correlated Noise in Interferometry
(Cornell University, 2019-02-25)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 ... -
Ground-state 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 weak-to-strong measurement transition
(AMER PHYSICAL SOC, 2021-06-11)In this work, we study the measurement transition for a coherent squeezed pointer state through a transition factor Gamma that involves a system-pointer coupling by using an arbitrary measured observable A. In addition, ... -
Macroscopic nonclassical-state preparation via postselection
(American Physical Society, 2017)Macroscopic quantum superposition states are fundamental to test the classical-quantum 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, 2020-07-20)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, 2021-01-6)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 non-orthogonal quantum states, generated ... -
Mutual Information and Quantum Discord in Quantum State Discrimination with a Fixed Rate of Inconclusive Outcomes
(MDPI, 2021-01)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 non-orthogonal quantum states, generated ... -
Nonlinear optomechanical resonance entering a self-organized energy transfer pattern
(Chaos, Solitons and Fractals, 2023-08)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 ... -
Optical qubit generation via atomic postselection in a Ramsey interferometer
(IOP PUBLISHING LTD, 2018)We propose a realizable experimental scheme to prepare a superposition of the vacuum and one-photon states using a typical cavity QED-setup. This is different from previous schemes, where the superposition state of the ... -
Optimizing synthetic diamond samples for quantum sensing technologies by tuning the growth temperature
(ELSEVIER SCIENCE SA, 2019)Control of the crystalline orientation of nitrogen-vacancy (NV) defects in diamond is here demonstrated by tuning the temperature of chemical vapor deposition (CVD) growth on a (113)-oriented diamond substrate. We show ... -
Phonon maser stimulated by spin postselection
(American Physical Society, 2020-06-09)In a sequence of single spins interacting longitudinally with a mechanical oscillator, and using the micromaser model with random injection, we show that after an appropriate postselection of each spin, a phonon laser ... -
Photon cooling by dispersive atom-field coupling with atomic postselection
(Cornell University, 2019-04-16)We propose, in a Ramsey interferometer, to cool the cavity field to its ground state, starting from a thermal distribution by a dispersive atom-field coupling followed by an atomic postselection. We also analyze the effect ... -
PT-symmetric phonon laser under gain saturation effect
(The Optical Society, 2020-07-20)As an analog of optical laser, phonon laser has potential applications in various areas. We study a type of phonon laser implemented by two coupled micro-cavities, one of which carries optical gain medium. The phonon laser ... -
Quantifying phonon-induced non-Markovianity in color centers in diamond
(AMER PHYSICAL SOC, 2020)We propose the application of a coherence-based measure for non-Markovianity to study the dynamics of color centers in diamond, where the optical coherence between two orbital states is affected by interactions with a ... -
Quantum Discord, Thermal Discord, and Entropy Generation in the Minimum Error Discrimination Strategy
(MDPI, 2019)We study the classical and quantum correlations in the minimum error discrimination (ME) of two non-orthogonal pure quantum states. In particular, we consider quantum discord, thermal discord and entropy generation. We ...