Resonance fluorescence of a two-level atom in a two-mode squeezed vacuum

Effect of decoherence on the radiative and squeezing properties in a coherently driven trapped two-level atom

“…Interaction of a single two-level atom with a radiation has received a great deal of interest in recent years [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. In the absence of the external light, spontaneous emission of an excited two-level atom results due to the fluctuations in a continuum of vacuum modes that play a role of a reservoir.…”

“…In accordance to this, throughout, the results previously obtained for squeezed input elsewhere [1] are compared with the effects of the thermal fluctuations so that which of the fluctuations in the reservoir modes would actually be essential in bringing about a significant modification in a radiative and squeezing properties ie evident. Though methods from the stochastic simulation of the Bloch equations in secular approximation [11,12] to diagonalizing the coefficient matrix [6,7,10] have been used in previous contributions, the differential equations associated with the expectation values of the atomic and energy operators following from the master equation would be simultaneously solved in view of the procedure recently applied. It is believed that this approach helps in overcoming the inevitable limitations corresponding to the approximations and computer simulation frequently employed.…”

“…4 and 5 shows that the width of the central line and sidebands broadened with the intensity of the decoherence, whereas the heights decreased. In connection to this, Parkins [11] has simulated the resonance fluorescence of a two-level atom coupled to a twomode squeezed vacuum reservoir and found that all the three peaks exhibit subnatural line widths for particular choice of the phase in a strong driving limit for a moderate squeezed input. On the other hand, Tanas et al [2] recently found that the spectral lines of the resonance fluorescence of the two-level atom coupled to finite band squeezed vacuum reservoir are narrower than for the ordinary vacuum and the side bands are slightly shifted.…”

Engineering a squeezed phonon reservoir with a bichromatic driving of a quantum dot

“…(42), and the other describing damping by the background thermal reservoir, the second and third terms in (42). In other words, the interaction of the quantum dot with an imperfect squeezed reservoir may be viewed as the interaction with two separate reservoirs, a maximally correlated squeezed reservoir and a thermal reservoir.…”

“…It is well known that the decay of a quantum system can be controlled and significantly modified by coupling the system to a squeezed vacuum field, which is characterized by the * Electronic address: gaox@phy.ccnu.edu.cn noise in one of the field quadrature components reduced below the usual vacuum level [40][41][42][43][44]. Particularly interesting effects of the squeezed vacuum field on the atomic radiative processes are the inhibition of the atomic decay and its dependence on the squeezing phase.…”