Optical photons are powerful carriers of quantum information, which can be delivered in free
space by satellites or in fibers on the ground over long distances. Entanglement of quantum …

An optical quantum memory is a device that can store photonic quantum information and
release it after a controlled time. It is an essential component for overcoming channel losses …

A quantum repeater node is presented based on trapped ions that act as single-photon
emitters, quantum memories, and an elementary quantum processor. The node's ability to …

Entanglement between photons at telecommunication wavelengths and long-lived quantum
memories is one of the fundamental requirements of long-distance quantum communication …

The quantum repeater protocol is a promising approach for implementing long-distance
quantum communication and large-scale quantum networks. A key idea of the quantum …

Ensemble-based quantum memories are key to develo** multiplexed quantum repeaters,
able to overcome the intrinsic rate limitation imposed by finite communication times over …

Distributing quantum entanglement between distant parties is a significant but difficult task in
quantum information science, as it can enable numerous applications but suffers from …

A cold atomic ensemble suits well for optical quantum memories, and its entanglement with
a single photon forms the building block for quantum networks that give promise for many …

We demonstrate the storage and retrieval of an on-demand single photon generated by a
collective Rydberg excitation in a low-noise Raman quantum memory located in a different …

We present an approach to entanglement purification on complex quantum network
architectures, that is, how a quantum network built from repeaters with limited processing …