"Qutrit" Experiments Are a First in Quantum Teleportation

Emily Conover

廖聪 LIAO Cong, 张炜 Zhang Wei, 柳华勃 LIU Hua-bo +1 more

Arun Sebastian, Afnan. N. Mansar, N. C. Randeep

Yi-Han Luo, Han-Sen Zhong, Manuel Erhard +9 more

Quantum teleportation allows a "disembodied" transmission of unknown quantum states between distant quantum systems. Yet, all teleportation experiments to date were limited to a two-dimensional subspace of quantized multiple levels of the quantum systems. Here, we propose a scheme for teleportation of arbitrarily high-dimensional photonic quantum states and demonstrate an example of teleporting a qutrit. Measurements over a complete set of 12 qutrit states in mutually unbiased bases yield a teleportation fidelity of 0.75(1), which is well above both the optimal single-copy qutrit state-estimation limit of 1/2 and maximal qubit-qutrit overlap of 2/3, thus confirming a genuine and nonclassical three-dimensional teleportation. Our work will enable advanced quantum technologies in high dimensions, since teleportation plays a central role in quantum repeaters and quantum networks.

Dik Bouwmeester, Jian-Wei Pan, Klaus Mattle +3 more

Hui Zhang, Lingxiao Wan, Tobias Haug +4 more

Currently most quantum teleportation experiments are based on qubits. Here, we demonstrate a quantum autoencoder assisted teleportation for high-dimensional quantum states. Our method of training the autoencoder allows us to take a finite sample of those states, learn how to compress them to qubits with nearly unit fidelity. High fidelity is achieved between the input qutrit and the qutrit recovered from the teleported qubit.