  Quantum radar is generally defined as a detection sensor that utilizes the
microwave photons like a classical radar. At the same time, it employs quantum
phenomena to improve detection, identification, and resolution capabilities.
However, the entanglement is so fragile, unstable, and difficult to create and
to preserve for a long time. Also, more importantly, the entangled states have
a tendency to leak away as a result of noise. The points mentioned above
enforces that the entangled states should be carefully studied at each step of
the quantum radar detection processes as follows. Firstly, the creation of the
entanglement between microwave and optical photons into the tripartite system
is realized. Secondly, the entangled microwave photons are intensified.
Thirdly, the intensified photons are propagated into the atmosphere
(attenuation medium) and reflected from a target. Finally, the backscattered
photons are intensified before the detection. At each step, the parameters
related to the real mediums and target material can affect the entangled states
to leak away easily. In this article, the entanglement behavior of a designed
quantum radar is specifically investigated. In this study, the quantum
electrodynamics theory is generally utilized to analyze the quantum radar
system to define the parameters influencing the entanglement behavior. The
tripartite system dynamics of equations of motions are derived using the
quantum canonical conjugate method. The results of simulations indicate that
the features of the tripartite system and the amplifier are designed in such a
way to lead the detected photons to remain entangled with the optical modes.
