A mentor initiated bi-directional controlled remote state preparation protocol for non-maximally entangled bell and GHZ states

In this paper, we present a quantum communication protocol for remote bi-directional prepara-tion of two and three-particle entangled states. The state to be prepared at one end is known to the party at the other end and vice versa. This information is utilized by the respective parties in the process of execution of the protocol. A Mentor and a Controller act at the beginning and towards the end of the process, respectively. The Mentor initiates the process through a measurement by which he creates entanglement between the two primary parties who are otherwise not connected through any quantum resource. The Controller signals the final step of the protocol after being satisfied with the performances of the other parties. The protocol has the advantage of avoiding the requirement of quantum resources with a relatively large number of qubits.