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Transiently changing shape of the photon number distribution in a quantum-dota??cavity system driven by chirped laser pulses
摘要： We have simulated the time evolution of the photon number distribution in a semiconductor quantum-dot–microcavity system driven by chirped laser pulses and compare with unchirped results. When phonon interactions with the dot are disregarded—thus corresponding to the limit of atomic cavity systems—chirped pulses generate photon number distributions that change their shape drastically in the course of time. Phonons have a strong and qualitative impact on the photon statistics. The asymmetry between phonon absorption and emission destroys the symmetry of the photon distributions obtained for positive and negative chirps. While for negative chirps transient distributions resembling thermal ones are observed, for positive chirps the photon number distribution still resembles its phonon-free counterpart but with overall smoother shapes. In sharp contrast, using unchirped pulses of the same pulse area and duration wave packets are found that move up and down the Jaynes-Cummings ladder with a bell shape that changes little in time. For shorter pulses and lower driving strength Rabi-like oscillations occur between low photon number states. For all considered excitation conditions transitions between sub- and super-Poissonian statistics are found at certain times. For resonant driving with low intensity the Mandel parameter oscillates and is mostly negative, which indicates a nonclassical state in the cavity ?eld. Finally, we show that it is possible that the Mandel parameter dynamically approaches zero and still the photon distribution exhibits two maxima and thus is far from being a Poissonian.
关键词： Mandel parameter,photon number distribution,chirped laser pulses,quantum-dot–cavity system,phonon interactions
更新于2025-09-23 15:21:01
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Physical and nonclassical properties of the interaction between a four-level atom and field in coherent state of Morse potential
摘要： The quantum system of the field initially defined by the k-photon-added Morse potential coherent states (MPCSs) of the radiation field interacting with a four-level atom (FLA) was studied. The physical and non-classical properties of the field defined by the MPCS system were quantified using the Mandel parameter. The effect of time-dependent coupling (TDC) on the atomic speed was examined. Moreover, the dynamic properties of the non-local correlation between the FLA and MPCS radiation field were studied and compared with those of the geometric phase. We also investigated the influence of the initial interaction conditions and different system parameters on the evolution of the non-local correlation, Mandel parameter, and geometric phase. The relationships between the geometric phase, Mandel parameter, and non-local correlation with TDC were explored.
关键词： Entanglement,Morse potential coherent states,Mandel parameter,Geometric phase
更新于2025-09-19 17:15:36