Correlated photons and collective excitations of a cyclic atomic ensemble (10 pages)

Non-classical correlation between a single photon and the collective spin excited state of a cold atomic ensemble

Generation and Storage of Single Photons in Collectively Excited Atomic Ensembles

Control of decoherence in the generation of photon pairs from atomic ensembles (15 pages)

Collective excitation and photon entanglement in double- $\sf \Lambda $ atomic ensemble

Quantum correlations of an atomic ensemble via an incoherent bath (5 pages)

Parametric conversion and maximally entangled photon pair via collective excitations in a cycle atomic ensemble