Multi Step multi input one way quantum information processing with spatial and temporal modes of light In this thesis the author develops for the first time an implementation methodology for arbitrary Gaussian operations using temporal mode cluster states. The author also presents three experiments involving continuous variable one way quantum computations where their non classical nature is shown by observing entanglement at the outputs. The experimental basic structure of one way quantum computation over two mode input state is demonstrated by the controlled Z gate and the optimum nonlocal gate experiments. Furthermore the author proves that the operation can be controlled by the gain tunable entangling gate experiment