A central theme in quantum information science is to coherently control an increasing number of quantum particles as well as their internal and external degrees of freedom (DoFs), meanwhile maintaining a high level of coherence. The ability to create and verify multiparticle entanglement with individual control and measurement of each qubit serves as an important benchmark for quantum technologies. To this end, genuine multipartite entanglement have been reported up to 14 trapped ions, 10 photons, and 10 superconducting qubits. Here, we experimentally demonstrate an 18-qubit Greenberger-Horne-Zeilinger (GHZ) entanglement by simultaneous exploiting three different DoFs of six photons, including their paths, polarization, and orbital angular momentum (OAM). We develop high-stability interferometers for reversible quantum logic operations between the photon's different DoFs with precision and efficiencies close to unity, enabling simultaneous readout of 262,144 outcome combinations of the 18-qubit state. A state fidelity of 0.708(16) is measured, confirming the genuine entanglement of all the 18 qubits.
@article{arxiv.1801.04043,
title = {18-qubit entanglement with photon's three degrees of freedom},
author = {Xi-Lin Wang and Yi-Han Luo and He-Liang Huang and Ming-Cheng Chen and Zu-En Su and Chang Liu and Chao Chen and Wei Li and Yu-Qiang Fang and Xiao Jiang and Jun Zhang and Li Li and Nai-Le Liu and Chao-Yang Lu and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1801.04043},
year = {2019}
}