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Acta Sinica Quantum Optica

Remote Preparation of a Three-paticle Entangled State

XU Mingdong

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

With three pairs of entangled particles as the quantum channel, we present a scheme for preparing remotely a three-particle entangled state. One different point between remote state preparation and quantum teleportation is that we assume Alice starts with complete classical knowledeg of the state but Bob doesn't. Then the state wanted will be got through a series of operation. Eventually, a conclusion that remote state preparation needs less classical resource than quantum teleportation can be made.

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理论物理通讯：英文版•Jan 1, 2004•0 citations
With three pairs of entangled particles as the quantum channel, we present a scheme for preparing remotely a three-particle entangled state. One different point between remote state preparation and quantum teleportation is that we assume Alice starts with complete classical knowledeg of the state but Bob doesn't. Then the state wanted will be got through a series of operation. Eventually, a conclusion that remote state preparation needs less classical resource than quantum teleportation can be made.
Quantum information theory has revolutionized the way in which information is processed using quantum resources such as entangled states, local operations and classical communications. Two important protocols in quantum communications are quantum teleportation and remote state preparation. In quantum teleportation neither the sender nor the receiver know the identity of a state. In remote state preparation the sender knows the state which is to be remotely prepared without ever physically sending the object or the complete classical description of it. Using one unit of entanglement and one classical bit Alice can remotely prepare a photon (from special ensemble) of her choice at Bob's laboratory. In remote state measurement Alice asks Bob to simulate any single particle measurement statistics on an arbitrary photon. In this talk we will present these ideas and discuss the latest developments and future open problems.
In this paper we consider a scheme for probabilistic remote state preparation of a general qubit by using W states. The scheme consists of the sender, Alice and two remote receivers Bob and Carol. Alice performs a projective measurement on her qubit in the basis spanned by the state she wants to prepare and its orthocomplement. This allows either Bob or Carol to reconstruct the state with finite success probability. It is shown that for some special ensembles of qubits, the remote state preparation scheme requires only two classical bits, unlike the case in the scheme of quantum teleportation where three classical bits are needed.