

Preprint 3/2019
Two-copy Quantum Teleportation
Quan Quan, Ming-Jing Zhao, Shao-Ming Fei, Heng Fan, and Gui-Lu Long
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Submission date: 09. Jan. 2019
Pages: 8
published in: Scientific Reports, 8 (2018), art-no. 13960
DOI number (of the published article): 10.1038/s41598-018-31918-0
Bibtex
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Abstract:
We investigate two-copy scenario of quantum teleportation based on Bell measurements. The detailed
protocol is presented and the general expression of the corresponding optimal teleportation fidelity
is derived, which is given by the two-copy fully entangled fraction that is invariant under local unitary
transformations. We prove that under a specific case of the protocol, which is significant for improving the
optimal fidelity, the set of states with their two-copy fully entangled fractions bounded by a threshold
value that required for useful two-copy teleportation is convex and compact. Hence the witness operators
exist to separate states that are useful for two-copy teleportation from the rest ones. Moreover, we show
that the optimal fidelity of two-copy teleportation surpasses that of the original one copy teleportation.