Non-linear integrated quantum optics with pulsed light
Prof. Christine Silberhorn (Universität Paderborn)

Quantum technologies promise a change of paradigm for many fields of application, for example in communication systems, in high-performance computing and simulation ofquantum systems, as well as in sensor technology. They can shift the boundaries of today’ssystems and devices beyond classical limits and seemingly fundamental limitations. Photonicsystems, which comprise multiple optical modes as well as many nonclassical light quantum states of light, have been investigated intensively in various theoretical proposals over the last decades. However, their implementation requires advanced setups of high complexity, which poses a considerable challenge on the experimental side. The successful realization of controlled quantum network structures is key for many applications in quantum optics and quantum information science.
Here we present three differing approaches to overcome current limitations for the experimentalimplementation of multi-dimensional quantum networks: non-linear integrated quantum optics, pulsed temporal modes and time-multiplexing. Non-linear integrated quantum devices with multiple channels enable the combinations of different functionalities, such as sources and fast electro-optic modulations, on a single compact monolithic structure. Pulsed photon temporalmodes are defined as field orthogonal superposition states, which span a high dimensional system. They occupy only a single spatial mode and thus they can be efficiently used in singlemode fibre communication networks. Finally, time-multiplexed quantum walks are a versatile tool for the implementation of a highly flexible simulation platform with dynamic control of the underlying graph structures and propagation properties.