Deterministic quantum teleportation between distant atomic objects

摘要

Quantum teleportation is a key ingredient of quantum networks and a buildingblock for quantum computation. Teleportation between distant material objectsusing light as the quantum information carrier has been a particularly excitinggoal. Here we demonstrate a new element of the quantum teleportation landscape,the deterministic continuous variable (cv) teleportation between distantmaterial objects. The objects are macroscopic atomic ensembles at roomtemperature. Entanglement required for teleportation is distributed by lightpropagating from one ensemble to the other. Quantum states encoded in acollective spin state of one ensemble are teleported onto another ensembleusing this entanglement and homodyne measurements on light. By implementingprocess tomography, we demonstrate that the experimental fidelity of thequantum teleportation is higher than that achievable by any classical process.Furthermore, we demonstrate the benefits of deterministic teleportation byteleporting a dynamically changing sequence of spin states from one distantobject onto another.