Deterministic joint refdemote preparation of general multi-qubit states

Abstract

In this paper, we propose several novel schemes for deterministic joint remote preparation of general multi-qubit states (JRSP) with complex parameters which overcome one of existing JRSP's major limitations: state preparation failure leading to the loss of valuable quantum channel resource. In our schemes, two or more participants independently share the classical knowledge of the prepared state in advance. Various partially entangled GHZ-type states with arbitrary complex parameters are used as the quantum channels. Only if all senders collaborate with each other, and perform appropriate projective measurements under suitable measurement basis on their own qubits, respectively, the receiver can reconstruct the prepared state by means of appropriate local unitary operations with success probability 1. Our scheme can ensure the prepared data available for the remote terminals under extreme conditions such as limited number of quantum channels and limited quantum information processing technologies.