Recently, there has been a surge of enthusiasm for harnessing light-based technology to process quantum information, with a special focus on an intriguing concept called quantum walk (QW). In simple terms, a quantum walk is the quantum version of a classical random walk, and its importance has been widely acknowledged. These quantum walks have emerged as indispensable tools with a multitude of applications across various domains, including quantum simulations, quantum search algorithms, quantum transport, universal quantum computations, and even machine learning. In our group, we are interested in the implementation and application of quantum walks in the realm of ultrafast photonic states of light. By studying how ultrashort single-photon pulses interact in a quantum walks, we aim to uncover new possibilities and push the boundaries of quantum information processing.