Three schemes of remote information concentration based on ancilla-free phase-covariant telecloning
In this paper, remote information concentration is investigated which is the reverse process of the \(1\rightarrow 3\) optimal asymmetric economical phase-covariant telecloning (OAEPCT). The OAEPCT is different from the reverse process of optimal universal telecloning. It is shown that the quantum information via \(1\rightarrow 3\) OAEPCT procedure can be remotely concentrated back to a single qubit with a certain probability via several quantum channels. In these schemes, we adopt Bell measurement to measure the joint systems and use projected measurement and positive operator-valued measure to recover the original quantum state. The results shows non-maximally entangled quantum resource can be applied to information concentration.
remote information concentration optimal asymmetric economical phase-covariant telecloning four-qubit ghz-type state four-qubit cluster state