Network science is a new and rapidly evolving branch of research that has hitherto aimed to

characterise classical networks observed in nature and society. In contrast, radically different

concepts apply for quantum systems, which can exhibit much stronger correlations than those

possible for any classical system. What does quantum bring to networks?

There are multiple possibilities for quantum aspects to appear within network formalisms, and there

is a sizeable body of literature discussing individual aspects of connected quantum systems. A

commonly discussed setting is one in which a network consists of quantum nodes, connected via

classical channels which carry quantum information. More intriguingly, settings may be envisaged

within which the entire network can be quantum-mechanical, including superpositions of nodes and

superpositions of links, leading to superpositions of network topology. Network with such properties

have no known (classical) graph that can describe its underlying structure, and might exhibit

radically different properties.

The aim of our project is to provide a unified formalism for quantum effects in networks and to

underpin this framework with clearly targeted measurement schemes. We will furthermore examine

the properties of model constituents of quantum networks in order to provide first experimental

bounds for the physical properties of such networks.

Beyond fundamental advances, we expect several practical implications to result from this project,

especially at the physical interface between classical and quantum networks. Security enhancement

provided by quantum schemes, such as quantum key distribution, is a well-known application. The

formal framework developed in this project will allow us, for example, to examine whether quantum

schemes can be used to enhance other aspects of network performance, or whether quantum

measurements can be used to determine network properties more efficiently than cla

## Personen

### Projektleiter_in

## Institut

## Förderungsmittel

- Vereine, Stiftungen, Preise

## Forschungsschwerpunkte

- Quantum Physics and Quantum Technologies

## Schlagwörter

## Externe Partner_innen

- Instituto de Telecomunicacoes
- National Institute of Informatics
- Central European University
- Oxford University