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This technical review examines the different methods and approaches used tocreate microwave modes quantum correlation. Specifically, we consider theelectro-opto-mechanical, optoelectronics, 4-coupled qubits, and InP HEMTcoupled with two external oscillator methods, and evaluate their effectivenessfor quantum applications. As these systems are open quantum systems, theyinteract with their environment and thermal bath. To ensure an accuratecomparison, we analyze all systems using the same gauge. Thus, all systems areshortly introduced, the total Hamiltonian is theoretically derived, andfinally, the system dynamics are analogously analyzed using the Lindblad masterequation. We then calculate the quantum correlation between cavity modes,signal-to-noise ratio, and fidelity for each system to evaluate theirperformance. The study result shows that the strength and nature of thecalculated quantities vary among the systems. One interesting result is theemergence of mixing behavior in the quantum correlation and signal-to-noiseratio for systems that use different cavities. It also identified a significantsimilarity between the 4-coupled qubits and InP HEMT coupled with externaloscillators methods, where an avoided-level crossing occurs in the quantumcorrelation. Additionally, the study reveals that the signal-to-noise ratio andclassical discord are more consistent than quantum discord.

Short Technical Review of Four Different Quantum Systems: Comparative Analysis of Quantum Correlation, Signal-to-Noise Ratio, and Fidelity