Year: 2018
Type: article
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.
Source: Scientific Reports
Authors: Quan Quan, Ming-Jing Zhao, Shao-Ming Fei, Heng Fan, Wen-Li Yang, Gui-Lu Long
Institutions: Northwest University, State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing Information Science & Technology University, Max Planck Institute for Mathematics in the Sciences, Capital Normal University, Chinese Academy of Sciences, Collaborative Innovation Center of Quantum Matter, Institute of Physics, Shaanxi Key Laboratory for Theoretical Physics Frontiers
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
Funders: National Science Foundation, National Natural Science Foundation of China, Beijing University of Posts and Telecommunications, Tsinghua University, State Key Laboratory of Networking and Switching Technology, Beijing Innovation Center for Future Chip, National Key Research and Development Program of China
OpenAlex ID: W2891651116