# Demonstration of quantum controlled teleportation for discrete variables on linear optical devices

## TL;DR

This paper reports an experimental demonstration of controlled quantum teleportation using linear optical devices with discrete variables, showing high fidelity and revealing that tripartite entanglement is not essential for the protocol.

## Contribution

The work experimentally implements controlled quantum teleportation with discrete variables and demonstrates that biseparable states suffice, challenging the necessity of tripartite entanglement.

## Key findings

- Achieved teleportation fidelity of around 83%.
- Controlled teleportation can be performed without tripartite entanglement.
- Lowered resource requirements for controlled quantum teleportation.

## Abstract

We report an experimental implementation of tripartite controlled quantum teleportation on the quantum optical devices. The protocol is performed through bi- and tripartite entangled channels of discrete variables and qubits encoded in polarization of individual photons. The experimental results demonstrate successful controlled quantum teleportation with a fidelity around $83\%$, well above the classical limit. By realizing the controlled quantum teleportation through biseparable state, we show that tripartite entangled is not a necessary resource for controlled quantum teleportation and the controller's capability to allow or prohibit the teleportation cannot be considered to be a manifestation of tripartite entanglement. These results open new possibilities for further application of controlled quantum teleportation by lowering teleportation channel's requirements.