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Physics Letters A 378, 3582–3585 (2014)

ISSN: 0375-9601, SCI

Perfect controlled joint remote state preparation independent ofentanglement degree ofthequantum channel

Nguyen Ba An, Cao Thi Bich

We construct a quantum circuit to produce a task-oriented partially entangled state and use it as the quantum channel for controlled joint remote state preparation. Unlike most previous works, where the parameters of the quantum channel are given to the receiver who can accomplish the task only prob-abilistically by consuming auxiliary resource, operation and measurement, here we give them to the supervisor. Thanks to the knowledge of the task-oriented quantum channel parameters, the supervisor can carry out proper complete projective measurement, which, combined with the feed-forward tech-nique adapted by the preparers, not only much economizes (simplifies) the receiver’s resource (operation) but also yields unit total success probability. Notably, such apparent perfection does not depend on the entanglement degree of the shared quantum channel. Our protocol is within the reach of current quan-tum technologies.

DOI: //dx.doi.org/10.1016/j.physleta.2014.10.030