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Quantifying non-classical correlations under thermal effects in a double cavity optomechanical system

Chinese Physics B 2020年第2期29卷 121-128页

作者： Mohamed Amazioug larbi jebli Mostafa Nassik Nabil Habiballah Department of Physics Ecole Normale Supérieure(ENS)Mohammed V University in RabatMorocco LPHE-MS Department of PhysicsFaculty of SciencesMohammed V UniversityRabatMorocco EPTHE Department of PhysicsFaculty of SciencesIbn Zohr UniversityAgadirMorocco Faculty of Applied Sciences Ibn Zohr UniversityAit-MelloulMorocco Abdus Salam International Center for Theoretical Physics Strada Costiera1134151TriesteItaly

We investigate the generation of quantum correlations between mechanical modes and optical modes in an optomechanical system,using the rotating wave approximation.The system is composed of two Fabry-Pérot cavities separated in space;each of the two cavities has a movable end-mirror.Our aim is the evaluation of entanglement between mechanical modes and optical modes,generated by correlations transfer from the squeezed light to the system,using Gaussian intrinsic entanglement as a witness of entanglement in continuous variables Gaussian states,and the quantification of the degree of mixedness of the Gaussian states using the purity.Then,we quantify nonclassical correlations between mechanical modes and optical modes even beyond entanglement by considering Gaussian geometric discord via the Hellinger distance.Indeed,entanglement,mixdness,and quantum discord are analyzed as a function of the parameters characterizing the system(thermal bath temperature,squeezing parameter,and optomechanical cooperativity).We find that,under thermal effect,when entanglement vanishes,purity and quantum discord remain nonzero.Remarkably,the Gaussian Hellinger discord is more robust than entanglement.The effects of the other parameters are discussed in detail.

关键词： cavity optomechanics quantum correlations Gaussian intrinsic entanglement purity Gaussian Hellinger discord Gaussian geometric discord

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Effect of weak measurement on quantum correlations

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Chinese Physics B 2020年第11期29卷 174-181页

作者： L jebli M Amzioug S E Ennadifi N Habiballah M Nassik EPTHE Department of PhysicsFaculty of SciencesIbn Zohr UniversityAgadirMorocco Faculty of Applied Sciences Ibn Zohr UniversityAit-MelloulMorocco Abdus Salam International Center for Theoretical Physics Strada Costiera11 I-34151TriesteItaly LHEP-MS Department of PhysicsFaculty of Science Mohammed V UniversityRabatMorocco Department of Physics Ecole Normale Sup´eieure(ENS)Mohammed V UniversityRabatMorocco

We investigate the local quantum uncertainty(LQU)in weak measurement.An expression of weak LQU is explicitly determined.Also,we consider some cases of three special X states,Werner state,circulant two-qubit states,and Heisenberg model via LQU in normal and weak measurements.We find that the LQU in weak measurement is weaker than the case of strong measurement.

关键词： local quantum uncertainty weak measurement weak local quantum uncertainty

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