Communications in Theoretical Physics

In this study, we exploit quantum information processing, the research field focusing on quantum two-mode
squeezed (QTMS) radar and quantum illumination (QI), to investigate the qualitative behaviors of entanglement, the entropy of formation, and squeezing in these protocols. We use logarithmic negativity to investigate
entanglement between the signal and idler and propose strategies to maintain entanglement at room temperature
in both protocols. We also calculate the entanglement, squeezing, and entropy for the QTMS radar when the
target is present and the signal is transmitted to the target. In addition, by controlling the squeezing parameter
which is a tool to control entanglement, entropy, and squeezing, the performance of the QTMS radar can be
improved, so this work shows how it is implemented in practice. In both protocols, entanglement is maintained
by considering conditions. Since the squeezing parameter controls both signal and idler power and the correlation between them, therefore, the qualitative behavior of squeezing in the QTMS radar and QI is also studied in
this research. The significant result obtained from the QI is that the entanglement maintains at high power, low
temperature, and high correlation between signal and idler. In contrast, in the QTMS, the entanglement survives
when the correlation and power are low, even at room temperature.

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