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Full control over the spatio-temporal structure of quantum states of light isan important goal in quantum optics, to generate for instance single-modequantum pulses or to encode information on multiple modes, enhancing channelcapacities. Quantum light pulses feature an inherent, rich spectralbroadband-mode structure. In recent years, exploring the use of integratedoptics as well as source-engineering has led to a deep understanding of thepulse-mode structure of guided quantum states of light. In addition, severalgroups have started to investigate the manipulation of quantum states by meansof single-photon frequency conversion. In this paper we explore new routestowards complete control of the inherent pulse-modes of ultrafast pulsedquantum states by employing specifically designed nonlinear waveguides withadapted dispersion properties. Starting from our recently proposed quantumpulse gate (QPG) we further generalize the concept of spatio-spectralengineering for arbitrary $\chitwo$-based quantum processes. We analyse thesum-frequency generation based QPG and introduce the difference-frequencygeneration based quantum pulse shaper (QPS). Together, these versatile androbust integrated optics devices allow for arbitrary manipulations of thepulse-mode structure of ultrafast pulsed quantum states. The QPG can beutilized to select an arbitrary pulse mode from a multimode input state,whereas the QPS enables the generation of specific pulse modes from an inputwavepacket with Gaussian-shaped spectrum.

From quantum pulse gate to quantum pulse shaper -- enigneered frequency conversion in nonlinear optical waveguides