Computer-inspired concept for high-dimensional multipartite quantum gates

Understand

An open question in quantum optics is how to manipulate and control complex quantum states in an experimentally feasible way.

• Here we present concepts for transformations of high-dimensional multi-photonic quantum systems.
• The proposals rely on two new ideas: (I) a novel high-dimensional quantum non-demolition measurement, (II) the encoding and decoding of the entire quantum transformation in an ancillary state for sharing the necessary quantum information between the involved parties.
• Many solutions can readily be performed in laboratories around the world, and identify important pathways for experimental research in the near future.