Effects of the cavity field on quantum beats

D. G. Norris, Rebecca Olson Knell, Jietai Jing +1 more

Pablo Barberis-Blostein, H. J. Carmichael, Luis A. Orozco +3 more

Sajid Qamar, M. Al-Amri, Shahid Qamar +1 more

We propose a scheme for the entanglement generation of two cavity modes using a four-level Raman-driven quantum-beat laser (QBL). The atomic coherence is generated by a Raman-type two-photon process. Two different sufficient conditions for entanglement generation have been investigated. The effect of cavity losses and strength of the driving fields on entanglement generation is studied for different initial states of the resonant cavity modes. The results are in agreement with the earlier scheme for the entanglement generation using a directly driven quantum-beat laser. We observe entanglement generation even for high cavity losses and with low strength of the driving fields. Further, there is no dipole-forbidden transition in the Raman-driven QBL system. Thus the proposed scheme for the entanglement generation is experimentally more viable as compared to the previous directly driven QBL system.

Andres D. Cimmarusti, Wanderson M. Pimenta, Burkley D. Patterson +3 more

M. M. Ashraf

The emission spectra of a \ensuremath{\Lambda}-type quantum-beat three-level atomic system in a cavity is investigated. Our results suggest that the atom cannot interact with a single-mode squeezed vacuum. A variety of field inputs exhibit nonclassical effects, including the vacuum Rabi splitting and quantum beats, only for low field intensities. In the case of a coherent field input, sidebands appear whose widths are governed by the input field statistics. Off-resonant spectra exhibit transitions from predominantly spontaneous to predominantly stimulated emission.

Shakir Ullah, Haleema Sadia Qureshi, Gul Tiaz +2 more

We study the entanglement dynamics of two-mode Gaussian state (TMGS) in a quantum beat laser driven by two classical fields in Raman configuration using Simon's criterion of quantum state separability. The two modes of the cavity field are considered initially in general single-mode Gaussian states. The effect of the non-classicality, purity, and relative phase of the cavity modes on the entanglement phenomenon is studied thoroughly. We show that in the presence of cavity decay rates, the higher the non-classicality of the initial states, the higher is the inseparability of the evolved TMGS of the cavity field. The inseparability, on the other side, is independent of the purity of the initial states. Moreover, the time scale of the entangled state increases with the relative intensity of the driving fields, whereas the relative phase switches the entangled state into the disentangled state of the cavity field and vice versa. The quantum statistics of the mean photons number of the cavity field is analyzed.