As CMOS technology reaches its limitations during the next decade, novel nano electronic devices like Carbon Nano Tubes, Single Electron Transistors, Quantum Cellular Automata, and Spin Transistors are being explored as future alternatives to CMOS devices. This research focuses on Quantum Cellular Automata (QCA) as a viable technology for future FPGA devices. Small device size, ultra low power consumption, and extremely high device operation speeds are some of the outstanding features of QCA which makes it attractive. In this research paper, modeling, implementation, and successful simulation of a CLB slice for a nano quantum FPGA in QCA technology is discussed. The design is modeled using standard QCA cells with multiple layers for reliable interconnect crossovers. The designs are implemented and simulated using the QCA Designer software tool.