Photon-nondestructive quantum networks

Quantum light-matter systems as information-processing modules constitute an ideal toolbox for future long-distance quantum communication and distributed quantum computation networks. Incorporating optical fiber technology has additional advantages such as miniaturization and novel protocols. Against this backdrop, single atoms in optical cavities have been used, e.g., as passive heralded quantum memories and nondestructive qubit detectors that can speed up a plethora of quantum communication protocols. Several such modules have been connected and employed to realize a nonlocal quantum gate, a novel teleportation protocol and a nondestructive Bell-state detector for distant atoms. Most recently, an optical cavity has been loaded with two individually addressable atoms in order to implement a random-access quantum memory and a scalable quantum-repeater node for secure quantum key distribution. The talk will highlight achievements in this respect and propose photon-nondestructive networks as a promising architecture for quantum science and technology.