Bose-Einstein yoğuşması üzerinde ışığın yayılımı ve kuantum dolaşıklığı

We investigate the optical response of coherent media, aBose-Einstein condensate (BEC), to intense laser pump stimulationsand weak probe pulse propagation.First, we adopt the coherence in sequential superradiance (SR) asa tool for continuous-variable (CV) quantum entanglement of twocounter-propagating pulses from the two end-fire modes. In thefirst-sequence the end-fire and side mode are CV entangled. In thesecond sequence of SR, this entanglement is swapped in between thetwo opposite end-fire modes.Second, we investigate the photonic bands of an atomic BEC with atriangular vortex lattice. Index contrast between the vortex coresand the bulk of the condensate is achieved through the enhancementof the index via atomic coherence. Frequency dependent dielectricfunction is used in the calculations of the bands. We adopt aPoynting vector method to distinguish the photonic band gaps fromabsorption/gain regimes.