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理论物理通讯：英文版

On Extension of Optimal Entanglement Concentration of GHZ States in Quantum-Dot and Micro-Cavity Coupled System

黄大足, 王一军, 郭迎

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

我们经由纠纷专注在扩大三位字节 GreenbergerHorneZeilinger (GHZ ) 状态的最佳的纠纷蒸馏三深裂部分 electron-spin-entangled 系统。二个纠纷集中协议同样详细被设计与在量点(QD ) 选择以后、微洞联合系统。建议协议能被重复与辅助 QD 的帮助完成最佳的成功可能性的几个回合，单个光子在此仅仅需要通过为每个回合微洞。就算实现的洞在整个过程期间在实践是有瑕疵的，它增加蒸馏的全部的成功概率。

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我们经由纠纷专注在扩大三位字节 GreenbergerHorneZeilinger (GHZ ) 状态的最佳的纠纷蒸馏三深裂部分 electron-spin-entangled 系统。二个纠纷集中协议同样详细被设计与在量点(QD ) 选择以后、微洞联合系统。建议协议能被重复与辅助 QD 的帮助完成最佳的成功可能性的几个回合，单个光子在此仅仅需要通过为每个回合微洞。就算实现的洞在整个过程期间在实践是有瑕疵的，它增加蒸馏的全部的成功概率。
We extend an optimal entanglement distillation of the triplet Greenberger—Horne—Zeilinger (GHZ) state via entanglement concentrating in the three-partite partially electron-spin-entangled systems. Two entanglement concentration protocols are similarly designed in detail with the post-selection in quantum-dot (QD) and micro-cavity coupled systems. The proposed protocol can be repeated several rounds to achieve an optimal success probability with an assistance of the ancillary QD, where only the single photon needs to pass through the micro-cavity for each round. It increases the total success probability of the distillation even if the implemented cavity is imperfect in practice during the whole process.
Abstract We present a compact entanglement concentration protocol (ECP) for unknown less-entangled three-electron-spin W states, resorting to the interaction rules between the circularly polarized photon and cavity-quantum-dot (QD) system. In the first step of our ECP, the parties utilize two less-entangled three-electron-spin systems not only to obtain one partially entangled three-electron-spin system with two unknown parameters if the odd-parity occurs with the parity-check gate (PCG) but also to get one entangled two-electron-spin system if the even-parity occurs. By exploiting the above three-electron-spin and two-electron-spin systems as the resource for the second step of our ECP, the parties can obtain a standard three-electron-spin W state if the odd parity occurs. Meanwhile, the systems in the even-parity instance can be used as the resource in the next round of our ECP. As the imperfect performances originated from the side leakage and the limited coupling strength of the cavity-QD system can be reflected by clicking the single-photon detectors, the fidelity of the PCG is unit, in principle, immune to strong coupling-strength restriction. Moreover, the success of our ECP not only is heralded by the detectors but also its efficiency further is improved by repeating the operation processes. Therefore, our ECP is useful in the quantum communication network.