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China-Ireland International Conference on Information and Communications Technologies (CIICT)

Controlled teleportation of multi-particle partially entangled state via a W state

Xiu‐Bo Chen, Qiaoyan Wen, Shiming Li, Liying Shangguan, Gang Xu, Fu-Chen Zhu

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We come up with a protocol for the controlled teleportation of an unknown multi-particle entangled state via a W state with a certain probability. One of the most important works in this paper is that all different unitary transformations performed by the receiver are summarized with a concise formula. On the other hand, we explicitly construct the efficient quantum circuits for implementing the proposed teleportation by means of universal quantum logic operations in quantum computation.

DOI
10.1049/cp:20080805

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We come up with a protocol for the controlled teleportation of an unknown multi-particle entangled state via a W state with a certain probability. One of the most important works in this paper is that all different unitary transformations performed by the receiver are summarized with a concise formula. On the other hand, we explicitly construct the efficient quantum circuits for implementing the proposed teleportation by means of universal quantum logic operations in quantum computation.
Utilizing the generalized measurement described by positive operator-valued measure, this paper comes up with a protocol for teleportation of an unknown multi-particle entangled (GHZ) state with a certain probability. The feature of the present protocol is to weaken requirement for the quantum channel initially shared by sender and receiver. All unitary transformations performed by receiver are summarized into a formula. On the other hand, this paper explicitly constructs the efficient quantum circuits for implementing the proposed teleportation by means of universal quantum logic operations in quantum computation.
We propose a scheme for controlled teleportation of a unknown two-particle state using a four-particle partly entangled state as a quantum channel and one of these particles works as the controlling particle.The sender and the controller perform a series of measurements on their own particles respectively and send their results to the receiver.According to the meassurement results,the receiver will get the state sent by sender with certain probabi-lity by doing proper unitary transformations and measurements on an auxiliary particle.
A scheme for teleporting a two-particle entangled state via special partial two-particle entangled W state and partial two-particle entangled state is proposed.There is a certain probability of successful teleportion of a two-particle entangled state if the sender performs two Bell-state measurements while the receiver first makes a measurement in the basis of {|0〉,|1〉},then performs a controlled-not operation and furthur introduces an ancillary qubit and performs an appropriate unitary transformation at last.Analysis shows: when the quantum channel is of maximal entanglement,namely the channel is composed of a special two-particle entangled W state and a Bell state,the teleportion probability of this scheme reachs 2/3 and the teleportion effect of this scheme is between the scheme whose quantum channel is composed of W states and the one whose quantum channel is composed of Bell states.