# Heidelberg 2015 – wissenschaftliches Programm

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# SYAD: Symposium SAMOP Dissertation-Prize 2015

## SYAD 1: Symposium SAMOP Dissertation-Prize 2015

### SYAD 1.2: Hauptvortrag

### Dienstag, 24. März 2015, 11:30–12:00, C/HSW

**Towards a quantum internet** — •Andreas Reiserer — Max-Planck-Institut für Quantenoptik, Garching, Germany — Kavli Institute of Nanoscience, TU Delft, Netherlands

A future quantum network will consist of quantum processors that are connected by quantum channels, just like conventional computers are wired up to form the Internet. In contrast to classical devices, however, the information that can be encoded in a quantum network grows exponentially with the number of nodes, and entanglement of remote particles gives rise to non-local correlations. Exploring these effects facilitates fundamental tests of quantum nonlocality and the quantum-to-classical transition. In addition, quantum networks can be applied in distributed quantum information processing to fundamentally enhance computational power and to ensure unbreakable encryption over global distances using quantum repeaters.

The realization of a large-scale quantum network requires an efficient interface between the nodes and channels. We have implemented such interface by trapping single atoms in optical resonators. With full experimental control over the atomic state, we have demonstrated the distribution and processing of quantum information in an elementary network consisting of two nodes. More specific, we have reversibly transferred the quantum state of a photon onto an atom, entangled distant atoms, teleported quantum states between them, nondestructively detected optical photons and demonstrated a quantum logic gate between an atom and one or several photons. These experiments pave the way for the realisation of global quantum networks.