# Quantum teleportation of shared quantum secret in amplitude-damping channel

## TL;DR

This paper presents a quantum teleportation scheme for sharing quantum secrets across an amplitude-damping channel using entangled states and local operations.

## Contribution

A novel (n,m)-type quantum teleportation protocol for shared quantum secrets in amplitude-damping networks with generalized dimensions.

## Key findings

- The proposed teleportation schemes achieve unit fidelity despite success probabilities less than 1.
- High-dimensional quantum states show higher success probabilities than low-dimensional states under equivalent AD conditions.
- The protocol enables distributed quantum information relay without a fully trusted central node.

## Abstract

We give the detailed processes for sharing a four-qubit pure entangled state as quantum channel in amplitude damping (AD) network channel via entanglement compensation.We propose a secure (2,2)-type quantum teleportation (QT) scheme based on this AD network channel, which allows 2-dimensional quantum information shared by 2 senders to be teleported to 2 receivers in such a way that after performing two Bell-state measurements by two senders, the original target state can be probabilistically reconstructed through introducing an auxiliary qubit and executing appropriate local unitary operations provided that all the receivers collaborate. We then extend it to the transmission of a 2-dimensional quantum secret state shared by n senders to m receivers (i.e., (n,m)-type QT of shared 2-dimensional quantum secret) from the perspectives of projective measurement, positive-operator-valued measurement (POVM) and generalized Bell-state measurement. Furthermore, we generalize the above (n,m)-type QT to the case of transmitting a shared d-dimensional quantum secret state. Our approach enables efficient and distributed quantum information relay, eliminating the need for a fully trusted central or intermediary node. The results show that our schemes achieve unit fidelity, though the success probabilities are less than 1. More interestingly, the QT protocol for high-dimensional quantum states exhibits a higher success probability than low-dimensional states under equivalent AD conditions.