QCA (Quantum Dot Cellular Automata) is an emerging and pioneer technology, which is a paradigm for computing with interacting quantum dots. Many eminent researchers have well thought of eloquent work in the existing areas of the sequential circuit. However, this paper proclaims three new approaches to design JK and T flip-flop. Since flip-flops and memory design are the crucial building blocks of digital circuits, therefore we concern the underlying principle of fundamental design of JK and T flip-flop and then work out to model the new structure favorable with the forthcoming excellence required. This new concept places elsewhere the need of using feedback path in flip flop design. Also two algorithms have been shown for explanatory purpose. The proposed structure is able to establish the validity and genuineness than earlier design. By using the proposed T flip-flop, a 2-bit and 3-bit counter is also designed in the paper. The simulation result of the proposed design proves their vigorousness and correctness in the output.