Investigation On The Theory Of Quantum Illumination With Applications In Radar Target Detection

Quantum radar is the prospective trend of the radar system technology,which has potentials to improve the resolution of radar detection substantially,and has become one of the promising technical directions for detecting stealth targets.Quantum illumination is an extraordinarily attractive quantum technology,in addition to the advantages of anti-interference and high resolution,which can also exploit the microwave signals for remote detection.Attributed to the aforementioned advantages,quantum illumination radar can also improve the system detection sensitivity even under the complicated environment with thermal noise and dissipation.In order to improve the detection range of quantum illumination radar in the atmosphere,the better technical solution is to use microwave as the detect signal.For generating the entangled signals in the microwave frequency band,it is proposed that the electro-optic quantum state converter entangles the quantum states between the light and the microwave.The electro-optic quantum state converter converts the optical signals into the microwave to transmit in the atmosphere for the purpose of long-distance detection.In this thesis,the development of quantum radar and its prospects are firstly investigated.The working principles of single photon quantum radar,receiver quantum enhanced radar and interferometric quantum radar are expounded.Based on these schemes,the principles and technical requirements of quantum illumination radar are studied emphatically.In order to realize the microwave detection of quantum illumination radar,the electro-optic quantum state converters,based on various working modes which are proposed in recent years,have been considered.To realize the effective entanglement and transformation between optical and microwave quantum states,the Hamiltonian operator of optical resonant cavity,mechanical harmonic resonator and microwave resonant cavity in the converter is studied.It is found that optical resonant cavity and microwave resonant cavity are correlated by the coupling effect of the mechanical harmonic oscillator.When the converter is at strong coupling,the normal mode is splitted.Secondly,the coupling relationship among the optical resonant cavity,the mechanical resonant cavity and the microwave resonant cavity is analyzed,and the entanglements between the parts of the electro-optic quantum converter are obtained.The entanglement level is characterized by logarithm negativity.Based on the working principles and optimized results of the electro-optic quantum converter,a novel converter is designed with micro-disk cavity and coplanar waveguide.The steps of the converter preparation process are given.The advantages of the structure are miniature footprint and easily integrated.