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71.
K. Berrada 《Optics Communications》2012,285(8):2227-2235
Quantum discord, a kind of quantum correlation, is defined as the mismatch between two quantum analogues of classically equivalent expressions of the mutual information. Distinguish classical and quantum correlations in quantum systems is therefore of both fundamental and practical importance. We investigate here the dynamics of classical and quantum correlations for two-mode coherent-state superposition in vacuum environment, which are known to be particularly useful for quantum information processing. By analytical and numerical analyzes we find that, contrary to what is usually stated in the literature, quantum discord under decoherence may exhibit sudden death and sudden birth phenomena, and we show also that the classical and quantum correlations vanish at infinite time. Moreover, the quantum discord may be less or more robust than entanglement against environment depending on different strength regimes of the optical fields of the two-mode coherent-state superposition. 相似文献
72.
73.
Houda Essousi Houcine Barhoumi Sofia Karastogianni Stella T. Girousi 《Electroanalysis》2020,32(7):1546-1558
An electrochemical sensor for amoxicillin (AMX) detection based on reduced graphene oxide (RGO), molecular imprinted overoxidized polypyrrole (MIOPPy) modified with gold nanoparticles (AuNPs) is described in this work. The electrochemical behavior of the imprinted and non‐imprinted polymer (NIP) was carried out by cyclic voltammetry (CV) and impedance spectroscopy (IS). The structure and morphology of the prepared MIP sensor were characterized by scanning electron microscopy (SEM), UV‐Visible, Fourier transform infrared spectroscopy (FTIR) and its experimental parameters such as monomer and template concentration, pH buffer solution, incubation time of AMX and AuNPs, scan rate as well as electropolymerization scan cycles were optimized to improve the performance of the sensor. The peak current obtained at the MIP electrode was proportional to the AMX concentration in the range from 10?8 to 10?3 mol L?1 with a detection limit and sensitivity of 1.22 10?6 mol L?1 (Signal to noise ratio=3) and 2.52×10?6 μAmol?1 L, respectively. It was also found that this sensor exhibited reproducibility and excellent selectivity against molecules with similar chemical structures. Besides, the analytical application of the AMX sensor confirms the feasibility of AMX detection in milk and human serum. 相似文献
74.
Jacqmin T Armijo J Berrada T Kheruntsyan KV Bouchoule I 《Physical review letters》2011,106(23):230405
We report on local, in situ measurements of atom number fluctuations in slices of a one-dimensional Bose gas on an atom chip setup. By using current modulation techniques to prevent cloud fragmentation, we are able to probe the crossover from weak to strong interactions. For weak interactions, fluctuations go continuously from super- to sub-Poissonian as the density is increased, which is a signature of the transition between the subregimes where the two-body correlation function is dominated, respectively, by thermal and quantum contributions. At stronger interactions, the super-Poissonian region disappears, and the fluctuations go directly from Poissonian to sub-Poissonian, as expected for a "fermionized" gas. 相似文献
75.
76.
77.
K. Berrada Y. Hassouni 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,61(2):513-521
In the framework of the U
q
(su(2)) quantum algebra, we
investigate the entanglement properties of two-spin systems, of
arbitrary spins j
1 and j
2, defined in an entanglement of
deformed spin coherent states of each of the spins. We derive the
amount of entanglement and we give conditions under which bipartite
entangled states become maximally entangled. Using these conditions,
we construct a large class of Bell states for any choices of the
parameters that specify the spin coherent states. 相似文献
78.
K. Berrada 《Annals of Physics》2014,340(1):60-69
Robustness of the geometric phase (GP) with respect to the environmental effects is a basic condition for an effective quantum computation. Here, we study quantitatively the GP of a two-level atom system driven by a phase noise laser under non-Markovian dynamics in terms of different parameters involved in the whole system. We find that with the change of the damping coupling, the GP is very sensitive to its properties exhibiting long collapse and revival phenomena, which play a significant role in enhancing the stabilization and control of the system dynamics. Moreover, we show that the GP can be considered as a tool for testing and characterizing the nature of the qubit–environment coupling. Due to the significance of how a system is quantum correlated with its environment in the construction of a scalable quantum computer, the entanglement dynamics between the qubit with its environment under external classical noise is evaluated and investigated during the time evolution. 相似文献
79.
Antonetti P. Berrada A. El Idrissi M. Chafik Claire Y. Kaloustian J. Périchaud A. 《Journal of Thermal Analysis and Calorimetry》1998,53(3):923-930
The oxidation of pure and recycled polyethylene samples was studied by thermal analysis (DTA-TG-DSC): presence of two exothermic
peaks and mass loss. The thermo-oxidation products, containing C-O and C=O links, were identified by IR spectrometry and GC-MS
spectrometry. The oxidation is easier from low to high density polyethylene.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
80.
The dynamics of a superconducting (SC) qubit interacting with a field under decoherence with and without time-dependent coupling effect is analyzed. Quantum features like the collapse–revivals for the dynamics of population inversion, sudden birth and sudden death of entanglement, and statistical properties are investigated under the phase damping effect. Analytic results for certain parametric conditions are obtained. We analyze the influence of decoherence on the negativity and Wehrl entropy for different values of the physical parameters. We also explore an interesting relation between the SC-field entanglement and Wehrl entropy behavior during the time evolution. We show that the amount of SC-field entanglement can be enhanced as the field tends to be more classical. The studied model of SC-field system with the time-dependent coupling has high practical importance due to their experimental accessibility which may open new perspectives in different tasks of quantum formation processing. 相似文献