698 research outputs found
Distributed entanglement induced by dissipative bosonic media
We describe a scheme with analytic result that allows to generate
steady-state entanglement for two atoms over a dissipative bosonic medium. The
resonant coupling between the mediating bosonic mode and cavity modes produces
three collective atomic decay channels. This dissipative dynamics, together
with the unitary process induced by classical microwave fields, drives the two
atoms to the symmetric or asymmetric entangled steady state conditional upon
the choice of the phases of the microwave fields. The effects on the
steady-state entanglement of off-resonance mediating bosonic modes are
analyzed. The entanglement can be obtained with high fidelity regardless of the
initial state and there is a linear relation in the scaling of the fidelity
with the cooperativity parameter. The fidelity is insensitive to the
fluctuation of the Rabi frequencies of the classical driving fields.Comment: to appear in Europhysics Letter
FeII and FeI emission in IRAS 07598+6508 and PHL 1092
One of the puzzles in understanding the spectra of active galactic nuclei
(AGN) is the origin of the FeII emission. FeI emission, if present, will help
reveal the physical conditions of the emitting gas. In an attempt to verify the
presence of FeI lines, high S/N spectra of two FeII-strong quasars, IRAS
07598-6508 and PHL 1092, were obtained at the Multiple Mirror Telescope and the
Steward 2.3 m Telescope. We have identified emission lines of FeI and TiII. The
source of energy for FeII, FeI and TiII emission is probably not from
ionization by the photon continuum, but heat. The high rate of energy
generation and the presence of both high and low velocity gas indicate that the
heat is generated not over a large area, but a narrow band in accretion disk,
in which the rotational speed decreases rapidly.Comment: 17 pages, Latex, figures available upon request, to appear in Ap
Intravitreous injection of Lucentis combined with argon laser photocoagulation for treatment of retinal macroaneurysm
AIM: To evaluate the clinical efficacy of intravitreous injection of Lucentis combined with argon laser photocoagulation on retinal macroaneurysm.<p>METHODS: A retrospective observation about intravitreous injection of Lucentis combined with argon laser photocoagulation was performed on 9 patients(9 eyes)with retinal macroaneurysms with macular edema between January 2011 and July 2013. Through the collection of clinical data in patients best-corrected visual acuity, change of the retinal macroaneurysm, optical coherence tomography and fluoresce in fundus angiography before therapy and 1 mouth,3 mouths after therapy, comparative analysis the changes in best-corrected visual acuity and central macular retinal thickness(CMT)between before and after treatment.<p>RESULTS: Followed for more than 3 months, all patients' best-corrected visual acuity were improved obviously, the difference was significant(<i>P</i><0.05); The patients' macular edema was obviously absorbed and the average CMT was significantly lower, the difference was significant(<i>P</i><0.05). In fundus fluorescein angiography, the neoplasia body was atrophied inordinately after 3 months of treatment.<p>CONCLUSION:Intravitreous injection of Lucentis combined with argon laser photocoagulation is effective and security to improving visual acuity of retinal macroaneurysms with macular edema
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