Network controlled teleportation of N-qubit state

Abstract

By employing the tensor analysis technique, we propose three schemes of controlled teleportation: series controlled, circular controlled and network controlled teleportation. We discuss the necessary and sufficient condition for realizing these schemes, in which we use a general two-qubit entangled state instead of the GHZ state as the communication channel. This enables successful implementation of teleportation without using the Hadamard operation.

Keywords:

• N-qubit state
• network controlled teleportation
• transformation matrix

Acknowledgements

The authors thank Dr X.-Q. Xi for fruitful discussions. This work was partially supported by the Natural Science Foundation of Shaanxi Province under Grant Nos. 2010JM1011, 2009JQ8006 and 2009JM6001. M.-L. Hu also acknowledges financial support by the Youth Foundation of Xi'an University of Posts and Telecommunications under Grant No. ZL2010-32.