Efficient Teleportation between Remote Single-Atom Quantum Memories

TL;DR

This paper reports a significant advancement in quantum teleportation by achieving high-fidelity transfer of quantum bits between distant single-atom memories using optical cavities, overcoming previous efficiency limitations.

Contribution

The work demonstrates remote quantum teleportation with a success probability nearly 5 orders of magnitude higher than prior experiments, utilizing cavity-enhanced photon collection.

Findings

Teleportation fidelity of 88% achieved

Success probability of 0.1% demonstrated

Use of optical cavities improves photon collection efficiency

Abstract

We demonstrate teleportation of quantum bits between two single atoms in distant laboratories. Using a time-resolved photonic Bell-state measurement, we achieve a teleportation fidelity of (88.0+/-1.5)%, largely determined by our entanglement fidelity. The low photon collection efficiency in free space is overcome by trapping each atom in an optical cavity. The resulting success probability of 0.1% is almost 5 orders of magnitude larger than in previous experiments with remote material qubits. It is mainly limited by photon propagation and detection losses and can be enhanced with a cavity-based deterministic Bell-state measurement.