Remote information concentration via $$W$$W state: reverse of ancilla-free phase-covariant telecloning

In this paper, we investigate generalized remote information concentration as the reverse process of ancilla-free phase-covariant telecloning (AFPCT) which is different from the reverse process of optimal universal telecloning. It is shown that the quantum information via $$1\rightarrow 2$$1→2 AEPCT procedure can be remotely concentrated back to a single qubit with a certain probability by utilizing (non-)maximally entangled $$W$$W states as quantum channels. Our protocols are the generalization of Wang’s scheme (Open J Microphys 3:18–21. doi:10.4236/ojm.2013.31004, 2013). And von Neumann measure and positive operator-valued measurement are performed in the maximal and non-maximal cases respectively. Relatively the former, the dimension of measurement space in the latter is greatly reduced. It makes the physical realization easier and suitable.

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