"Non-linear integrated quantum optics with pulsed light"
Quantum technologies promise a change of paradigm for many fields of application, for
example in communication systems, in high-performance computing and simulation of
quantum systems, as well as in sensor technology. They can shift the boundaries of today’s
systems and devices beyond classical limits and seemingly fundamental limitations. Photonic
systems, 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 experimental
implementation 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 temporal
modes 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.
https://physik.uni-paderborn.de/en/silberhorn/
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