Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetric Bidirectional Quantum Teleportation using a Six-Qubit Cluster
  State as a Quantum Channel   Bidirectional quantum teleportation is a fundamental protocol for exchanging
quantum information between two quantum nodes. All bidirectional quantum
teleportation protocols till now have achieved a maximum efficiency of $40\%$.
Here, we propose a new scheme for symmetric bidirectional quantum teleportation
using a six-qubit cluster state as the quantum channel, for symmetric
($3\leftrightarrow3$) qubit bidirectional quantum teleportation of a special
three-qubit entangled state. The novelty of our scheme lies in its
generalization for ($N\leftrightarrow N$) qubit bidirectional quantum
teleportation employing a $2N$-qubit cluster state. The efficiency of the
proposed protocol is remarkably increased to $50\%$ which is highest till now.
Interestingly, only GHZ-state measurements and four Toffoli-gate operations are
necessary which is independent of the number $(N)$ of qubits to be teleported.

37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
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The categories of this paper are: ao-sci