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Entropy 2019, 21(4), 352; https://doi.org/10.3390/e21040352

Probabilistic Resumable Quantum Teleportation of a Two-Qubit Entangled State

1
School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
2
School of Physics, Northwest University, Xi’an 710127, China
3
Institute of Modern Physics, Northwest University, Xi’an 710127, China
4
Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi’an 710127, China
*
Author to whom correspondence should be addressed.
Received: 7 February 2019 / Revised: 23 March 2019 / Accepted: 25 March 2019 / Published: 1 April 2019
(This article belongs to the Special Issue Entropy in Foundations of Quantum Physics)
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Abstract

We explicitly present a generalized quantum teleportation of a two-qubit entangled state protocol, which uses two pairs of partially entangled particles as quantum channel. We verify that the optimal probability of successful teleportation is determined by the smallest superposition coefficient of these partially entangled particles. However, the two-qubit entangled state to be teleported will be destroyed if teleportation fails. To solve this problem, we show a more sophisticated probabilistic resumable quantum teleportation scheme of a two-qubit entangled state, where the state to be teleported can be recovered by the sender when teleportation fails. Thus the information of the unknown state is retained during the process. Accordingly, we can repeat the teleportion process as many times as one has available quantum channels. Therefore, the quantum channels with weak entanglement can also be used to teleport unknown two-qubit entangled states successfully with a high number of repetitions, and for channels with strong entanglement only a small number of repetitions are required to guarantee successful teleportation. View Full-Text
Keywords: quantum teleportation; two-qubit entangled state; partially entangled state; local unitary operation; controlled-U gate quantum teleportation; two-qubit entangled state; partially entangled state; local unitary operation; controlled-U gate
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Wang, Z.-Y.; Gou, Y.-T.; Hou, J.-X.; Cao, L.-K.; Wang, X.-H. Probabilistic Resumable Quantum Teleportation of a Two-Qubit Entangled State. Entropy 2019, 21, 352.

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