Remote Quantum-Information Concentration: Reversal of Ancilla-Free Phase-Covariant Telecloning — Oak Academic Publishing
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Remote Quantum-Information Concentration: Reversal of Ancilla-Free Phase-Covariant Telecloning
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha, China
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Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, China
1 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha, China
2 Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, China
Telecloning and its reverse process, referred to as remote quantum-information concentration (RQIC), have been at tracting considerable interest because of their potential applications in quantum-information processing. The previous RQIC protocols were focused on the reverse process of the optimal universal telecloning. We here study the reverse process of ancilla-free phase-covariant telecloning (AFPCT). It is shown that the quantum information originally dis tributed into two spatially separated qubits from a single qubit via the optimal AFPCT procedure can be remotely con centrated back to a single qubit with a certain probability by using an asymmetric W state as the quantum channel.
KeywordsRemote Quantum-Information ConcentrationPhase-Covariant TelecloningW State
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