We propose channel matrices by using unfolding matrices from their reduced density matrices. These channel matrices can be a criterion for a channel whether the channel can teleport or not any qubit state. We consider a special case, teleportation of the arbitrary two-qubit state by using the four-qubit channel. The four-qubit channel can only teleport if the rank of the related channel matrix is four.
Intisari Kami perlihatkan skema teleportasi terkontrol dua kubit sembarang via kanal lima kubit yang merupakan kombinasi dari keadaan GHZ dan keadaan Bell. 30 dari 32 kombinasi pengukuran oleh Alice dan Charlie memberi transformasi uniter berpasangan, positip-negatip, dan hanya dua yang tidak berpasangan.
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