The Non-classical Properties Of Non-Gaussian Thermal State And Its Analytical Evolution And Decoherence

The advantages of Gauss state(such as coherent state and thermal state)in practical applications are convenient for manipulation and preparation,but there are still many insurmountable limit that needed to overcome.Thus,people want to find non-Gauss operations and the corresponding Gauss resource to make up the disadvantage of Gauss resource.So far,it is a important topic in quantum optical to prepare new kind of non-Gauss state in practice and theory.It promotes the development of quantum state control engineering and provides a new physical carrier for long distance quantum information processing.In this paper,two kinds of new non-Gauss state were introduced by acting adding-photon operation and superposition operation to display thermal state,and their nonclassical properties,evolution law and decoherence have been investigated too.The main content contains three parts as follow:1?Introducing a new kind of non-Gauss thermal states generated by adding arbitrary photons to a displaced thermal state,i.e.,the photon-added displaced thermal states(PADTS),then investigating the nonclassiacl property of the PADTS by the IWOP technique and phase space distributions.Enumerating photon count statistics value condition of PADTS in different magnitude relation between the number of detected-photon is and the photon-added number.In addition,there has a similar modulation effect between increase of the displacement and adding photon numbers,this conclusion is used to interpret some phenomenons of the PADTS.2?Discussing the decoherence feature of PADTS in amplitude decay channel,the result show that the nonclassicality of PADTS will "revive" after the negative volumes of WF reduce to zero which seems in sharp contrast to previous studies,and giving a qualitative explanation combining with previous conclusions for this phenomenon which agreement with the graphs generally.3?Presenting normal product representations of thermal-state superposition employing the IWOP technique and investigate their nonclassical features,such as quadrature squeezing,sub-Poissonian distribution,and partial negativity of the Wigner function.Giving the figures and the evolution law of these properties under different parameters.