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Quantum Information Processing

Faithful teleportation via multi-particle quantum states in a network with many agents

Min Jiang, Hui Li, Zengke Zhang, Jia Zeng

Published Feb 1, 2011• 18 citations
Publisher
DOI
10.1007/s11128-011-0228-z

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An efficient scheme is proposed for faithful teleportation of an arbitrary unknown multi-qudit state via multi-qudit quantum states, in which the teleportation is completely deterministic providing that one can successfully construct a group of generalized Bell pairs. Our scheme can effectively avoid possible destruction of the unknown state to be teleported, which however may occur in existing probabilistic teleportation schemes. In addition, we develop a scheme for establishing a faithful quantum channel for both indirect and direct teleportation multi-particle system, which can be applied in a teleportation network where intermediate agents exist between a sender and a receiver. Compared to the indirect construction of the faithful channel, the required auxiliary particle resources, local operations and classical communications in the direct construction scheme are considerably reduced.
Quantum teleportation faithfully transfers the quantum state of a physical system, instead of the system itself, which underlies the proposal of global quantum communication network. In this paper, we propose a faithful multi-hop quantum communication scheme. In a quantum network, different types of Greenberger-Horne-Zeilinger (GHZ) states are previously shared on quantum links. To implement qubits transmission, the sender and intermediate nodes perform quantum measurements in parallel, and then send their measurement results and the types of previously shared GHZ states to the receiver independently. A general formula is deduced for the receiver, who chooses an appropriate unitary operation to perform on the local particle, the original qubit can be retrieved. Our scheme shows advantages in quantum communication delay.