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Advanced Quantum Technologies

Controlled Cyclic and Bidirectional Hybrid Quantum Communication of Arbitrary Two‐Qubit States

Li‐Hua Gong, Xiu‐Bo Chen, Gang Xu, Zongpeng Li

Published Jan 10, 2024• 8 citations
Publisher

Abstract

Abstract Hybrid quantum communication with the combination of quantum teleportation and remote preparation is hopeful for promoting the development of quantum networks and enriching the diversity of quantum network communication. To improve the communication efficiency and enhance the scalability of the quantum networks, a meaningful protocol for controlled cyclic and bidirectional hybrid quantum communication of arbitrary two‐qubit states is proposed, which allows quantum information to be transmitted simultaneously in both directions among multiple participants. With the permission of one controller, each observer can simultaneously transmit arbitrary known two‐qubit states and unknown ones to their adjacent observers, by implementing remote preparation and quantum teleportation in the clockwise and counterclockwise directions. Furthermore, the participants just carry out some quantum measurements and recovery operations to achieve the communication target, and the desired states can be attained with a unit success probability, thus the protocol is deterministic. Finally, some comparisons are also made with other similar protocols, which shows that the protocol is better in qubit efficiency and communication capacity.

DOI
10.1002/qute.202300183

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Quantum secure communications could securely transmit quantum information by using quantum resource. Recently, novel applications such as bidirectional and asymmetric quantum protocols have been developed. \n \nIn this paper, we propose a new method for generating entanglement which is highly useful for multiparty quantum communications such as teleportation and Remote State Preparation (RSP). As one of its applications, we propose a new type of quantum secure communications, i.e. cyclic RSP protocols. Starting from a four-party controlled cyclic RSP protocol of one-qubit states, we show that this cyclic protocol can be generalized to a multiparty controlled cyclic RSP protocol for preparation of arbitrary qubit states. We point out that previous bidirectional and asymmetric protocols can be regarded as a simpler form of our cyclic RSP protocols.
Abstract We present a novel scheme for hybrid bidirectional controlled quantum communication (HBCQC) using a nine-qubit entangled state as the quantum channel. In this scheme, the two remote parties, Alice and Bob, act as both senders and receivers. Alice seeks to teleport an unknown single-qubit state to Bob; simultaneously, Bob intends to assist Alice in remotely preparing an arbitrary tripartite three-qubit entangled state. It is shown that the HBCQC can be completed successfully only if the two senders and the controller collaborate with one another. This scheme is well-suited for heterogeneous and uncoordinated quantum networks, and it advances both their practical implementation and theoretical foundations.
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