Quantum teleportation enables the deterministic exchange of qubits via lossy channels. While it is commonly believed that unconditional teleportation requires a preshared entangled qubit pair, here we demonstrate a protocol that is in principle unconditional and requires only a single photon as an ex-ante prepared resource. The photon successively interacts, first, with the receiver and then with the sender qubit memory. Its detection, followed by classical communication, heralds a successful teleportation. We teleport six mutually unbiased qubit states with average fidelity F=(88.3±1.3)% at a rate of 6Hz over 60m.
@article{arxiv.2105.04338,
title = {Quantum Teleportation between Remote Qubit Memories with Only a Single Photon as a Resource},
author = {Stefan Langenfeld and Stephan Welte and Lukas Hartung and Severin Daiss and Philip Thomas and Olivier Morin and Emanuele Distante and Gerhard Rempe},
journal= {arXiv preprint arXiv:2105.04338},
year = {2021}
}