Efficient quantum circuits for perfect and controlled teleportation of n-qubit non-maximally entangled states of generalized Bell-type

TL;DR

This paper presents efficient quantum circuits for perfect and controlled teleportation of n-qubit non-maximally entangled states using minimal quantum channels like Bell and GHZ states, improving resource economy.

Contribution

It introduces new protocols for teleporting complex entangled states with fewer quantum resources and identifies a family of GHZ-like states suitable for controlled teleportation.

Findings

Uses Bell states for perfect teleportation of n-qubit states.

Employs GHZ or GHZ-like states for controlled teleportation.

Identifies 12 orthogonal GHZ-like states as effective quantum channels.

Abstract

An efficient and economical scheme is proposed for the perfect quantum teleportation of n-qubit non-maximally entangled state of generalized Bell-type. A Bell state is used as the quantum channel in the proposed scheme. It is also shown that the controlled teleportation of this n-qubit state can be achieved by using a GHZ state or a GHZ-like state as quantum channel. The proposed schemes are economical because for the perfect and controlled teleportation of n-qubit non-maximally entangled state of generalized Bell-type we only need a Bell state and a tripartite entangled state respectively. It is also established that there exists a family of 12 orthogonal tripartite GHZ-like states which can be used as quantum channel for controlled teleportation. The proposed protocols are critically compared with the existing protocols.