An Economical Scheme for Cloning an Unknown M-Qudit Equatorial-Like State with Assistance |
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Authors: | CHEN Xiu-Bo MA Song-Ya PANG Bo YANG Yi-Xian WEN Qiao-Yan |
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Institution: | [1]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 |
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Abstract: | We propose a scheme to realize quantum cloning of an unknown M-qudit equatorial-like entangled state. The first stage of the protocol requires teleportation. After the teleportation is accomplished, the receiver can reestablish the original state. In the second stage of the protocol, with theassistance (through a single-particle projective measurement) of thepreparer, the perfect copy of an original state can be produced at the site of the sender. Our scheme requires a single maximally entangled qudit pair as the quantum channel and three dits classical communication. The scheme is feasible at the expense of consuming local resources which include M-1 ancillary qudits introduced by the receiver and additional bi-qudit operations. Moreover, we construct a sort of unitary transformations which ensure ancillary qudits are not necessarily introduced by the sender. Comparing tothe previous protocols, the proposed protocol is economical due to that the cost of both quantum nonlocal resources and classical communication is lowest. |
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Keywords: | quantum assisted cloning maximal entanglement projective measurement local unitary operation |
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