Asymmetric Quantum Information Splitting of an Arbitrary N-qubit State via GHZ-like State and Bell States

Abstract

In this manuscript, a novel and economical scheme for asymmetric quantum information splitting (AQIS) of an arbitrary N-qubit state is investigated. Instead of multi-qubit entangled states, the maximally entangled states, which are made up of a three-qubit GHZ-like entangled state and (N-1) sets of Bell states, are used as quantum information carrier. It is shown that the proposed AQIS scheme can be faithfully realized by performing appropriate Bell state measurements (BSMs), single qubit measurements (SMs) and local unitary operations (LUOs), rather than multi-qubit entanglement or multi-particle joint measurements, which make it more convenient and feasible in a practical application than some previous schemes. Furthermore, its intrinsic efficiency for qubits approaches 100 %, and the total efficiency really approaches the maximal value, which is higher than those of some previous symmetric quantum information splitting (QIS) schemes. Finally, the proposed scheme can be proven information-theoretically secure from the views of participant attack and outside attack in detail. © 2014 The Author(s).