We theoretically study the statistics of photon emission of single multi-level quantum system by employing the generating functions approach developed recently. The generalized decay constants are included in single m...We theoretically study the statistics of photon emission of single multi-level quantum system by employing the generating functions approach developed recently. The generalized decay constants are included in single multi-level quantum system with quasi-degenerated levels in this work although they are normally neglected in the absence of （quasi-）degeneracies in multi-level quantum system within the rotating wave approximation. The quantum beats, the line shapes and the Mandel＇s Q parameters, etc. are studied.展开更多
In this work, we theoretically analyze the few-photon emissions generated in a coupled double quantum dots （CDQDs）-single mode microcavity system, under continuous wave and pulse excitation. Compared with the uncoup...In this work, we theoretically analyze the few-photon emissions generated in a coupled double quantum dots （CDQDs）-single mode microcavity system, under continuous wave and pulse excitation. Compared with the uncoupled case, strong sub-Poissonian character is achieved in a CDQDs--cavity system at a certain laser frequency. Based on the pro- posed scheme, single photon generation can be obtained separately under QD-cavity resonant condition and off-resonant condition. For different cavity decay rates, we reveal that laser frequency detunings of minimum second-order autocorre- lation function are discrete and can be divided into three regions. Moreover, the non-ideal situation where two QDs are not identical is discussed, indicating the robustness of the proposed scheme, which possesses sub-Poissonian character in a large QD difference variation range.展开更多
The influence of vacuum fluctuation and phonon bath on the probability of single photon emission are both consid- ered in the two-level system model theoretically; by using the master equations and generating function...The influence of vacuum fluctuation and phonon bath on the probability of single photon emission are both consid- ered in the two-level system model theoretically; by using the master equations and generating function method we get the analytical expression of the second-order fluorescence correlation function, probability of single photon emission, and Mandel＇s Q parameter. The results manifest that the coupling between the phonon bath and single photon source destroys the superposition state induced by the square laser pulse, the Rabi oscillation damped rapidly with the increasing of tem- perature. Theoretically, when the structure parameter of arsenide quantum dots tx scaled to O. 1 times of the sample, the critical coherence-temperature will rise up to hundreds of Kelvin, which means a step forward to the realization of coherent control of single photon source at room temperature.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10674083 and 10874102)partially by the Research Fund for the Doctoral Program of Higher Education(Grant No.200804220004)the support from the National Found for Fostering Talents of Basic Science(NFFTBS)(Grant No.J0730318)
文摘We theoretically study the statistics of photon emission of single multi-level quantum system by employing the generating functions approach developed recently. The generalized decay constants are included in single multi-level quantum system with quasi-degenerated levels in this work although they are normally neglected in the absence of （quasi-）degeneracies in multi-level quantum system within the rotating wave approximation. The quantum beats, the line shapes and the Mandel＇s Q parameters, etc. are studied.
基金supported by the National Natural Science Foundation of China(Grant Nos.61372037 and 61401035)the Beijing Excellent Ph.D.Thesis Guidance Foundation,China(Grant No.20131001301)the Fund of State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications),China(Grant No.IPOC2015ZC05)
文摘In this work, we theoretically analyze the few-photon emissions generated in a coupled double quantum dots （CDQDs）-single mode microcavity system, under continuous wave and pulse excitation. Compared with the uncoupled case, strong sub-Poissonian character is achieved in a CDQDs--cavity system at a certain laser frequency. Based on the pro- posed scheme, single photon generation can be obtained separately under QD-cavity resonant condition and off-resonant condition. For different cavity decay rates, we reveal that laser frequency detunings of minimum second-order autocorre- lation function are discrete and can be divided into three regions. Moreover, the non-ideal situation where two QDs are not identical is discussed, indicating the robustness of the proposed scheme, which possesses sub-Poissonian character in a large QD difference variation range.
基金Project supported by the Fundamental Research Funds for the Central Universities of Central South University,China(Grant No.2014zzts145)
文摘The influence of vacuum fluctuation and phonon bath on the probability of single photon emission are both consid- ered in the two-level system model theoretically; by using the master equations and generating function method we get the analytical expression of the second-order fluorescence correlation function, probability of single photon emission, and Mandel＇s Q parameter. The results manifest that the coupling between the phonon bath and single photon source destroys the superposition state induced by the square laser pulse, the Rabi oscillation damped rapidly with the increasing of tem- perature. Theoretically, when the structure parameter of arsenide quantum dots tx scaled to O. 1 times of the sample, the critical coherence-temperature will rise up to hundreds of Kelvin, which means a step forward to the realization of coherent control of single photon source at room temperature.
