Efficient circular controlled quantum teleportation and broadcast schemes in the presence of quantum noises

This paper takes advantage of the quantum mechanics to present two efficient circular controlled quantum communication schemes. The proposed protocols utilize ten qubits for transmitting the information qubits to five partners circularly, under the permission of a controller. The first protocol is a circular controlled quantum teleportation, which teleports unknown quantum states. The second protocol is a circular controlled quantum broadcast scheme which sends quantum states to two dispersed recipients, circularly. In this paper, the effects of quantum noises on these protocols are analyzed, and the fidelity of the quantum states is calculated too. We will see that, in the circular controlled quantum teleportation protocol, the impact of the noise on input qubits is less than its impact on channel qubits.