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Deterministic Clone of an Unknown N-Qubit Entangled State with Assistance |
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| Authors: | Song-Ya Ma Xiu-Bo Chen Xiao-Wei Guan Xin-Xin Niu Yi-Xian Yang |
| Institution: | 1. Information Security Center, State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China 2. Key Laboratory of Network and Information Attack and Defence Technology of MOE, Beijing University of Posts and Telecommunications, Beijing, 100876, China 3. National Engineering Laboratory for Disaster Backup and Recovery, Beijing University of Posts and Telecommunications, Beijing, 100876, China 4. School of Mathematics and Information Sciences, Henan University, Kaifeng, 475004, China 5. School of Mathematical Sciences, Peking University, Beijing, 100871, China |
| Abstract: | We propose a deterministic scheme to realize assisted-clone of an unknown N(≥3)-qubit entangled state. The first stage of the protocol requires teleportation via maximal entanglement as the quantum channel. In the second stage of the protocol, a novel set of mutually orthogonal basis vectors are constructed. With the assistance of the preparer through an N-particle projective measurement under this basis, the perfect copy of an original state can be produced. Comparing with the previous protocols which produce the unknown state and its orthogonal complement state at the site of the sender, our scheme generates the unknown state deterministically. |
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