Classical communication and entanglement cost in preparing a class of multi-qubit states

TL;DR

This paper introduces a new protocol for remotely preparing a specific class of multi-qubit states that reduces classical communication and entanglement costs, making the process more economical and feasible.

Contribution

A novel protocol using CNOT gates that improves efficiency over previous methods in remote state preparation of multi-qubit states.

Findings

Reduced classical communication cost

Lower quantum entanglement requirements

Easier state identification process

Abstract

Recently, several similar protocols[J. Opt. B 4 (2002) 380; Phys. Lett. A 316 (2003) 159; Phys. Lett. A 355 (2006) 285; Phys. Lett. A 336 (2005) 317] for remotely preparing a class of multi-qubit states (i.e, $\alpha|0 ... 0>+\beta|1... 1>$) are proposed, respectively. In this paper, by applying the controlled-not (CNOT) gate, a new simple protocol is proposed for remotely preparing such class of states. Compared to the previous protocols, both classical communication cost and required quantum entanglement in our protocol are remarkably reduced. Moreover, the difficulty of identifying some quantum states in our protocol is also degraded. Hence our protocol is more economical and feasible.