A universal protocol for bidirectional controlled teleportation with network coding
Meng-Yao He, Song-Ya Ma, Kun-Peng Kang · Communications in Theoretical Physics · 2021
Abstract We investigate bidirectional teleportation that works in a fair and efficient manner. Two explicit protocols are proposed to realize bidirectional teleportation with a controller. One is a symmetric protocol for two-qubit states. The other is an asymmetric protocol for single- and two-qubit states. We then devise a universal protocol for arbitrary n 1 - and n 2 -qubit states via a (2 n 1 + 2 n 2 + 1)-qubit entangled state, where n 1 ≤ n 2 . The receiver only needs to perform the single-qubit recovery operation, which is derived by a general expression. Moreover, a (2 n 1 + 1)-bit classical communication cost can be saved within the controller’s broadcast channel by the use of network coding technology.