Approximate quantum state reconstruction without a quantum channel

We investigate the optimal quantum state reconstruction from cloud to many spatially separated users by measure-broadcast-prepare scheme without the availability of quantum channel. The quantum state equally distributed from cloud to arbitrary number of users is generated at each port by ensemble of...

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Bibliographic Details
Published inarXiv.org
Main Authors Yang, Zichen, Ze-Yang Fan, Liang-Zhu, Mu, Fan, Heng
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.12.2018
Subjects
Clouds
Physics - Quantum Physics
Quantum theory
Reconstruction
Upper bounds
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Summary:We investigate the optimal quantum state reconstruction from cloud to many spatially separated users by measure-broadcast-prepare scheme without the availability of quantum channel. The quantum state equally distributed from cloud to arbitrary number of users is generated at each port by ensemble of known quantum states with assistance of classical information of measurement outcomes by broadcasting. The obtained quantum state for each user is optimal in the sense that the fidelity universally achieves the upper bound. We present the universal quantum state distribution by providing physical realizable measurement bases in the cloud as well as the reconstruction method for each user. The quantum state reconstruction scheme works for arbitrary many identical pure input states in general dimensional system.
ISSN:2331-8422
DOI:10.48550/arxiv.1710.02296