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Issue
EPL
Volume 87, Number 3, August 2009
Article Number 30006
Number of page(s) 6
Section General
DOI http://dx.doi.org/10.1209/0295-5075/87/30006
Published online 27 August 2009
EPL, 87 (2009) 30006
DOI: 10.1209/0295-5075/87/30006

Remote preparation of arbitrary two- and three-qubit states

Jin-Ming Liu1, 2, Xun-Li Feng2, 3 and C. H. Oh2, 3

1   State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University Shanghai 200062, PRC
2   Department of Physics, National University of Singapore - 2 Science Drive 3, Singapore 117542, Singapore
3   Centre for Quantum Technologies, National University of Singapore - 3 Science Drive 2, Singapore 117543, Singapore

jmliu@phy.ecnu.edu.cn

received 24 March 2009; accepted in final form 27 July 2009; published August 2009
published online 27 August 2009

Abstract
We present a scheme for remotely preparing an arbitrary two-qubit pure state by using two bipartite partially entangled states as the quantum channel, the scheme is then generalized to the arbitrary three-qubit case. For the two cases of remote state preparation, we construct two different efficient projective measurement bases at sender's side and calculate the corresponding success probabilities. It is shown that remote preparation of the two-qubit or three-qubit state can be probabilistically achieved with unity fidelity. Moreover, for some special ensembles of the initial states, we find that the success probability of preparation can be increased to four times for two-qubit states and eight times for three-qubit states, and is equal to one in the case of the maximal entanglement resources.

PACS
03.67.Hk - Quantum communication.
03.67.-a - Quantum information.

© EPLA 2009