Remote Preparation of Single-Photon "Hybrid" Entangled and Vector-Polarization States

TL;DR

This paper demonstrates remote preparation of complex two-qubit hybrid entangled states in single photons, including vector-polarization states, using spin and orbital angular momentum encoding, with high fidelity for quantum networking applications.

Contribution

It reports the first experimental remote preparation of two-qubit hybrid entangled states, expanding quantum teleportation capabilities beyond single-qubit systems.

Findings

Successful remote preparation of two-qubit hybrid entangled states.

High-fidelity reconstruction of vector-polarization states.

Potential for improved coupling in quantum networks.

Abstract

Quantum teleportation faces increasingly demanding requirements for transmitting large or even entangled systems. However, knowledge of the state to be transmitted eases its reconstruction, resulting in a protocol known as remote state preparation. A number of experimental demonstrations to date have been restricted to single-qubit systems. We report the remote preparation of two-qubit "hybrid" entangled states, including a family of vector-polarization beams. Our single-photon states are encoded in the photon spin and orbital angular momentum. We reconstruct the states by spin-orbit state tomography and transverse polarization tomography. The high fidelities achieved for the vector-polarization states opens the door to optimal coupling of down-converted photons to other physical systems, such as an atom, as required for scalable quantum networks, or plasmons in photonic nanostructures.