Abstract
In this paper, we provide an operational criterion for controlled dense coding (CDC) with a general class of three-qubit partially entangled states. A general three-qubit pure entangled state can be classified into two inequivalent classes according to their genuine tripartite entanglement. We claim that if a three-qubit state shows entanglement characteristic similar to Greenberger–Horne–Zeilinger (GHZ)-class, then such non-trivial tripartite states are useful in CDC whereas states belonging to the W-class are not useful for that. We start with a particular class of non-trivial partially entangled states belonging to the GHZ-class and show that they are effective in CDC. Then we cite several other examples of different types of tripartite entangled states to support our conjecture.
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Acknowledgements
M M Ali acknowledges the support from the Ministry of Science and Technology of Taiwan and the Physics Division of National Center for Theoretical Sciences, Taiwan.
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Roy, S., Ghosh, B. & Ali, M.M. Operational criterion for controlled dense coding with non-trivial tripartite entangled states. Pramana - J Phys 91, 50 (2018). https://doi.org/10.1007/s12043-018-1630-1
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DOI: https://doi.org/10.1007/s12043-018-1630-1
Keywords
- Greenberger–Horne–Zeilinger-states
- W-states
- partially entangled states
- maximal sliced states
- symmetric states
- controlled dense coding