Výsledky vyhledávání - "Mihaescu, Tatiana"

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Steering witnesses for unknown Gaussian quantum states

Autor: Mihaescu, Tatiana, Kampermann, Hermann, Isar, Aurelian, Bruß, Dagmar

We define and fully characterize the witnesses based on second moments detecting steering in Gaussian states by means of Gaussian measurements. All such tests, which arise from linear combination of variances or second moments of canonical operators,

Externí odkaz: http://arxiv.org/abs/2304.11239

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Dynamics of quantum discord of two coupled spin-1/2 subjected to time-dependent magnetic fields

Autor: Grimaudo, Roberto, Mihaescu, Tatiana, Isar, Aurelian, Ghiu, Iulia, Messina, Antonino

Publikováno v: Results in Physics 13, 102147 (2019)

We describe the dynamics of quantum discord of two interacting spin-1/2 subjected to controllable time-dependent magnetic fields. The exact time evolution of discord is given for various input mixed states consisting of classical mixtures of two Bell

Externí odkaz: http://arxiv.org/abs/2101.07697

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Quantum Correlation Dynamics in Controlled Two-Coupled-Qubit Systems

Autor: Ghiu, Iulia, Grimaudo, Roberto, Mihaescu, Tatiana, Isar, Aurelian, Messina, Antonino

Publikováno v: Entropy 22, 785 (2020)

We study and compare the time evolutions of concurrence and quantum discord in a driven system of two interacting qubits prepared in a generic Werner state. The~corresponding quantum dynamics is exactly treated and manifests the appearance and disapp

Externí odkaz: http://arxiv.org/abs/2010.03968

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Detecting entanglement of unknown continuous variable states with random measurements

Autor: Mihaescu, Tatiana, Kampermann, Hermann, Gianfelici, Giulio, Isar, Aurelian, Bruss, Dagmar

Publikováno v: New Journal of Physics 22, 123041 (2020)

We explore the possibility of entanglement detection in continuous variable systems by entanglement witnesses based on covariance matrices, constructible from random homodyne measurements. We propose new linear constraints characterizing the entangle

Externí odkaz: http://arxiv.org/abs/2007.05650

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Suppression of entanglement in two-mode Gaussian open systems

Autor: Mihaescu, Tatiana, Isar, Aurelian

Publikováno v: Romanian J. Phys. 60, 853-858 (2015)

We study the evolution of the entanglement of two independent bosonic modes embedded in a thermal environment, in the framework of the theory of open quantum systems. As a measure of entanglement we use the logarithmic negativity. For a non-zero temp

Externí odkaz: http://arxiv.org/abs/1512.02674

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