Browsing by Author "Eremeev, Vitalie"

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    Dynamical features of the quantum correlations in atom-cavity-fibre network
    (2014) Eremeev, Vitalie; Ciobanu, Nellu; Coto Cabrera, Raúl; Orszag Posa, Miguel
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    Entanglement of two distant qubits driven by thermal environments
    (2012) Montenegro Tobar, Víctor Alejandro; Eremeev, Vitalie; Orszag Posa, Miguel
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    Generation of phonon quantum states and quantum correlations among single photon emitters in hexagonal boron nitride
    (2024) Molinares, Hugo; Pinilla, Fernanda; Muñoz Tavera, Enrique; Muñoz, Francisco; Eremeev, Vitalie
    Hexagonal boron nitride exhibits two types of defects with great potential for quantum information technologies: single-photon emitters (SPEs) and one-dimensional grain boundaries hosting topologically-protected phonons, termed as topologically-protected phonon lines (TPL). Here, by means of a simple effective model and density functional theory calculations, we show that it is possible to use these phonons for the transmission of information. Particularly, a single SPE can be used to induce single-, two- and qubit-phonon states in the one-dimensional channel, and (ii) two distant SPEs can be coupled by the TPL that acts as a waveguide, thus exhibiting strong quantum correlations. We highlight the possibilities offered by this material-built-in nano-architecture as a phononic device for quantum information technologies.
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    Ground-state cooling of a nanomechanical oscillator with N spins
    (2018) Montenegro Tobar, Víctor Alejandro; Coto Cabrera, Raúl; Eremeev, Vitalie; Orszag Posa, Miguel
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    High-fidelity synchronization and transfer of quantum states in optomechanical hybrid systems
    (2022) Molinares, Hugo; Eremeev, Vitalie; Orszag, Miguel
    In a hybrid scheme, consisting of a three-level atom-cavity-oscillator system, we show that synchronization [J. Czartowski, R. Muller, K. Zyczkowski, and D. Braun, Phys. Rev. A 104, 012410 (2021)] and transfer of nonclassical states between the mechanical oscillator and the cavity field is possible. In this framework, we show that an initially thermalized mechanical oscillator, when connected to a squeezed bath, evolves to a squeezed state which in steady state is synchronized with the cavity mode. On the other hand, if the mechanical oscillator is initially prepared in a nonclassical state, e.g., squeezed and Schrodinger's cat states, while the cavity is in a thermal state, then a periodic transfer between the mechanical oscillator and cavity mode occurs for given interaction times. As qualitative results, we prove that the synchronization and transfer of the quantum states are feasible with high fidelity.
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    Phonon trapping states as a witness for generation of phonon blockade in a hybrid micromaser system
    (2022) Molinares, Hugo; Eremeev, Vitalie; Orszag, Miguel
    In a hybrid micromaser system consisting of an optical cavity with a moving mirror connected to a low-temperature thermal bath, we demonstrate, both analytically and numerically, that for certain interaction times between a random atomic flux and the optomechanical cavity, vacuum phonon trapping states are generated. Furthermore, under the approach of the master equation with independent phonon and photon thermal baths, we show that the trapping of the phonons and photons is achieved for the same interaction times. The results also indicate that by increasing the cavity-oscillator coupling, one may generate a coherent phonon state aside from the trapping states. Within the same hybrid system, but now connected to the squeezed phonon reservoir, a phonon blockade effect can be engineered. Moreover, we identify an interconnection between the trapping and blockade effects, particularly if one approaches the vacuum trapping state, strong phonon blockade can be achieved when the system is connected with a weakly squeezed phonon reservoir.
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    Quantum statistical approach to the theory of random lasers
    (2011) Eremeev, Vitalie; Orszag Posa, Miguel
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    Quantum theory of a two-mode open-cavity laser
    (2011) Eremeev, Vitalie; Orszag Posa, Miguel
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    The power of a control qubit in weak measurements
    (2017) Coto Cabrera, Raúl; Montenegro Tobar, Víctor Alejandro; Eremeev, Vitalie; Mundarain, Douglas; Orszag Posa, Miguel
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    Thermally generated long-lived quantum correlations for two atoms trapped in fiber-coupled cavities
    (2012) Eremeev, Vitalie; Montenegro Tobar, Víctor Alejandro; Orszag Posa, Miguel