## 2 Literature Survey  
A new optimization-based post-processing framework was developed [15] to improve the effectiveness and safety of CV-QKD systems. The suggested solution used raw data collected from quantum communications, in conjunction with a classical authenticated communication channel for the creation of a shared secret key between authorized parties. Incorporation of optimization approaches into the post-processing step ensured the out performance of standard framework methods in key generation efficiency and overall security. The method surpassed previous solutions according to the experimental results, especially when it came to maximizing key extraction from quantum data that were noisy. Nevertheless, the study's neglect of reducing transmission loss and channel noise during the quantum communication phase constituted a major drawback. In the absence of these,there is space for development; they are essential for ensuring reliable work from CV-QKD systems in real-world noisy systems. Maximizing post-processing efficiency in capacity-constrained Continuous Variable Quantum Key Distribution (CV-QKD) systems was considered in [16] to find the best system parameters for key generation, and the method used systematic optimization techniques such as modulation variance and error correction matrix optimization. Based on their findings, the suggested approach indicated the significant out performance of earlier methods in terms of Information Reconciliation (IR) efficiency, reaching 91.34%. The methods encountered a hurdle in the form of the continuous feature of quadrature measurement, not withstanding this accomplishment. Because of this feature of CV-QKD systems, more complicated and computationally demanding error correction algorithms are required, which increase the system's total complexity and may affect the approach's applicability in real-world situations. In an effort to improve the efficiency and safety of quantum key distribution systems, ref. [17] laid the groundwork for a CV-QKD protocol that does not rely on any particular measuring equipment. The protocol improved transmission quality with the incorporation of a Noiseless Linear Amplifier (NLA) to amplify quantum states, which efficiently compensated for channel attenuation. The results from experiments showed the out performance of the method over the state of the art in terms of Information Reconciliation (IR) efficiency, indicating its ability to improve key generation rates in real-world quantum communication systems. Despite these improvements, the study had a major flaw: it did not check the authenticated of the quantum devices (transmitters and receivers), which might have exposed the system to security concerns caused by tampered with or compromised hardware. In their proposal, [18] sought to optimize the parameters of long-distance CV-QKD systems using non-Gaussian operations, with the goal of improving their performance. They improved the safe transmission distance in CV-QKD systems using the Direct Search algorithm to determine the ideal settings of the Quantum Scissor (QC), an essential component of their approach. With fidelity levels ranging from 161% to 304%, their experimental results showed the strategy significantly improved the range of secure quantum key exchanges. Despite the presence of improvements in transmission distance and fidelity, the method failed to protect against side-channel attacks, which could be a security risk in real-world applications. This void led to the requirement for a further study into long-distance CV-QKD systems, to include protections against side-channel exploitation. Improvement in the control of quantum states during transmission was the main focus in [19]. A framework for modulation leakage-free Continuous Variable Quantum Key Distribution (CV-QKD) systems was suggested.