Research On Photon Emission Features And Nonlinearities Of Quantum-Dot- Microcavity Coulping System

Quantum information processing and quantum optical communication are the inevitable development trend of information photonics. The realization of high efficient quantum light sources and high-speed information processing devices is one of the key problems to be solved. Supported by the National Natural Science Foundation of China(Grant No 61372037,60971068), the research works presented in this doctoral thesis focus on photon emission features and nonlinearities of quantum-dot-microcavity coupling system and aim to be applied in single photon sources and optical quantum information processing devices. The main contents and innovative ideas are listed below:1. The photon emission features of quantum-dot-bimodal-cavity coupling system under driving of both modes are studied systematically. The sub-Poissonian feature of photons is demonstrated under resonant driving due to the quantum interference between super-Poissonian photons and Poissonian photons. We propose a strategy of adjusting the driving strength ratio between the two modes to optimize the sub-Poissonian feature of photons. Studies on the dependences of system parameters on the sub-Poissonian feature suggest that, ultra-strongly sub-Poissonian feature with second order correlation of 10-7 can be achieved in the quantum-dot-bimodal-cavity coupling system with experimentally accessible parameters, implying prospective applications on pure single photon sources.2. The photon emission features of quantum-dot-cavity-array coupling system are studied using the sub-Poissonian feature optimization strategy of adjusting the driving strength ratio between modes, the cavity array composed by two empty cavities driven by continuous wave at the sides and center cavity coupled to a quantum dot. Optimizing by adjusting the driving strength ratio under resonant driving, the minimum second order correlation of the system is over two magnitudes lower than that of quantum-dot-bimodal-cavity coupling system with the same parameters. Studies on the dependences of total driving strength on the sub-Poissonian feature and intracavity photon number suggest that the system can be used to realize effective pure single photon sources.3.The polarization-related nonlinear response of quantum-dot-bimodal-cavity coupling system under external magnetic field is investigated. Driven by a single weak laser pulse with linear polarization of a certain cavity mode, the corresponding mode photon oscillation is suppressed and replaced by photon with orthogonal mode. For two pulses with different polarizations of cavity modes, the polarization of intracavity photons shows significant preference for a prepulse at a proper time delay due to the destructive interference between the photons from prepulse oscillation and ones from postpulse.4. We design schemes of optical switching and optical Control-NOT gate by employing the prepulse as control pulse, the postpulse with delay as signal pulse, and the photon response with the polarization of postpulse as output based on the suppression effect of postpulse in the system.