Host Institute: University of Geneva
Project Supervisor: Dr Mikael Afzelius
ESR: Antonio Ortu
Starting date: January 2017
Duration: 3 years
Quantum repeaters enable the distribution of quantum states over long distances, and are at the core of future quantum networks, or the “quantum internet”. They also enable long-distance QKD and remote quantum sensing. This disruptive technology is extremely challenging, particularly due to the need for high performance quantum memories, which are needed for storage or quantum processing in the network. In this project we will work on a solid-state quantum memory system based on rare-earth-ion doped crystals (REIC). These systems have advanced to a position where they are among the main candidates for quantum memories. We will aim at creating quantum correlations between a single spin excitation in an REIC and a telecommunications photon, which is the basic resource for quantum repeaters, using Raman-type excitations. To this end we will develop a scheme for generating correlations first between a visible photon and a stored spin excitation. We will then work on techniques for extending the storage time to the millisecond regime using NMR techniques. Finally we will investigate methods for converting the visible photon to the telecom domain (a quantum interface), such as sum-frequency-generation, and characterize the quantum correlations using photon counting techniques.
To be updated.