Generation And Measurement Of Light With Strong Antibunching Using Displaced Squeezed Vacuum State

Nonclassical light fields with a property of strong antibunching are important resources for quantum information and quantum optics.Based on the quantum interference effect of nonlinear optics,a strong antibunching light can be obtained by superposing the squeezed vacuum state and the coherent state of a specific phase on an optical beam splitter.Squeezing degree and displacement can be independent adjustment for optimal antibunching.In this paper,combined with the parameters of the experiment system,we have theoretically studied the influence of the squeezing degree of the squeezed vacuum state and the amplitude of the coherence state on the generating of an antibunching light.Under the optimal displacement condition,analyzed the influence of the measurement of g^（2）（0）of the antibunching light with system total efficiencies、background noises、Hanbury Brown-Twiss（HBT）and Double HBT measurement method.Discussed g^（2）（0）and average photon rate of the quantum state where the g^（2）（0）error is 0.The main contents of this article include:（1）This paper introduces the significance and background of the study of the strong antibunching,as well as the research progress of generation and measurement of light with antibunching.（2）The coherence theory of the light and the experimental principle of HBT are described,and several common properties of nonclassical,the first experimentally observed quantum properties antibunching of nonclassical light fields.Finally,the theoretical knowledge of generating antibunching light field using displaced squeezed vacuum state is introduced.（3）The second order coherence g^（2）（0）of the antibunching light is theoretically calculated,including the ideal case（the system efficiency is 1,the background noise is 0,the number of photon can be resolved）,the experimental situation.Calculated the relative error"（experimental value-ideal value）"/"ideal value""×100%"between the ideal situation and the experimental situation.We can within the 1%error margin to find the parametric region where the Displaced Squeezed Vacuum State has antibunching.Under the optimal displacement condition,analyzed the influence of the measurement of g^（2）（0）of the antibunching light with system total efficiencies,background noises,HBT and Double HBT measurement method.Discussed g^（2）（0）and average photon rate of the quantum state where the g^（2）（0）error is 0.（4）Theoretical models for measuring the third order coherence g^（3）（0）and the fourth order coherence g^（4）（0）of the field is established,and the theoretically calculated and analysis of the third order coherence and the fourth order coherence of the antibunching light are carried out.It is found that with the increase of the order,the variation range of the light correlation function becomes larger,indicating that the high order coherence is more affected by the external environment and is more sensitive to the external environment.