Deterministic quantum teleportation between distant atomic objects

TL;DR

This paper demonstrates deterministic continuous variable quantum teleportation between distant macroscopic atomic ensembles at room temperature, advancing quantum network capabilities.

Contribution

It introduces the first deterministic cv teleportation between distant atomic objects, using light-mediated entanglement and process tomography for validation.

Findings

Teleportation fidelity exceeds classical limits.

Successful teleportation of dynamically changing spin states.

Implementation of deterministic teleportation at room temperature.

Abstract

Quantum teleportation is a key ingredient of quantum networks and a building block for quantum computation. Teleportation between distant material objects using light as the quantum information carrier has been a particularly exciting goal. Here we demonstrate a new element of the quantum teleportation landscape, the deterministic continuous variable (cv) teleportation between distant material objects. The objects are macroscopic atomic ensembles at room temperature. Entanglement required for teleportation is distributed by light propagating from one ensemble to the other. Quantum states encoded in a collective spin state of one ensemble are teleported onto another ensemble using this entanglement and homodyne measurements on light. By implementing process tomography, we demonstrate that the experimental fidelity of the quantum teleportation is higher than that achievable by any classical process. Furthermore, we demonstrate the benefits of deterministic teleportation by teleporting a dynamically changing sequence of spin states from one distant object onto another.