Real-time imaging of spin-to-orbital angular momentum quantum state teleportation

TL;DR

This paper demonstrates the first real-time photonic hybrid quantum teleportation transferring polarization states to orbital angular momentum, verified with high fidelity, advancing secure quantum communication methods.

Contribution

It reports the first experimental realization of spin-to-orbital angular momentum quantum teleportation with real-time visualization and high fidelity, enabling new secure quantum communication approaches.

Findings

Achieved real-time visualization of teleported states.

Fidelity of teleportation exceeds 99.4%.

Demonstrated deterministic hybrid teleportation scheme.

Abstract

Quantum teleportation is a process in which an unknown quantum state is transferred between two spatially separated subspaces of a bipartite quantum system which share an entangled state and communicate classically. In the case of photonic states, this process is probabilistic due to the impossibility of performing a two-particle complete Bell state analysis with linear optics. In order to achieve a deterministic teleportation scheme, harnessing other degrees of freedom of a single particle, rather than a third particle, has been proposed. Indeed, this leads to a novel type of deterministic teleportation scheme, the so-called hybrid teleportation. Here we report the first realization of photonic hybrid quantum teleportation from spin-to-orbital angular momentum degrees of freedom. In our scheme, the polarization state of photon A is transferred to orbital angular momentum of photon B. The teleported states are visualized in real-time by means of an intensified CCD camera. The quality of teleported states is verified by performing quantum state tomography, which confirms an average fidelity higher than 99.4%. We believe this experiment paves the route towards a novel way of quantum communication in which encryption and decryption are carried out in naturally different Hilbert spaces, and therefore may provide means of enhancing security.