A Scheme of Bidirectional Remote State Preparation of Four-Qubit States Using an Eight-Qubit Quantum Entangled Channel

The remote state preparation (RSP) plays an important role in quantum information processing. In this study we present a scheme, where an eight-qubit entangled state is used as the quantum channel to prepare the four-qubit entangled state in a bidirectional manner. In this scheme, two distant parties, Alice and Bob are not only senders but also receivers, and Alice wants to assist Bob in remotely preparing a known four-qubit state, while Bob wants to assist Alice in remotely preparing a four-qubit state, respectively. We show that our scheme is deterministic, meaning that the bidirectional remote state preparation can have a 100% overall success probability.