Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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
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.

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The categories of this paper are: gr-qc
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The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math