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arXiv:1207.3048 · Annals of Physics

Improving the efficiency of single and multiple teleportation protocols based on the direct use of partially entangled states

Raphael Fortes, Gustavo Rigolin

Published Jun 21, 2013• 11 citations
arXivHTMLPDF
DOI
10.1016/j.aop.2013.06.009

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We introduce an efficient and versatile quantum teleportation protocol for specific types of n-qubit entangled states. By employing a partially entangled Greenberger-Horne-Zeilinger (GHZ) state as the quantum channel and an optimal Positive Operator-Valued Measure (POVM) based on an improved reciprocal state formulation, we achieve unambiguous state discrimination. The scheme has been generalized to support various entangled state configurations and demonstrates a notable reduction in classical communication costs for these states compared to standard Bell-basis teleportation. Its capacity for integration with conventional protocols is pivotal, enhancing quantum hop-by-hop communication security by allowing strategic choices in quantum channel and teleportation strategy
We show that the multiple teleportation protocol (MTP) given in reference (J Modławska and A Grudka 2008 Phys. Rev. Lett. 100 110503) is not restricted to the Knill–Laflamme–Milburn (KLM) framework. Rather, we show that MTP can be implemented using any teleportation scheme. We also present two new MTPs which, under certain situations, are more efficient than the original one, requiring half of the number of its teleportations to achieve at least the same probability of success ( ). One of the protocols, however, uses less entanglement than the others yielding, surprisingly, the greatest .