One-to-Many Economical Phase-Covariant Cloning and Telecloning of Qudits

• 作者: 杨国健 汪新文 苏玉环
• 来源期刊: 中国物理快报(英文版)
• 学科: 工学
• 关键词: 克隆 远程 协变 经济 非最大纠缠态 幺正变换 非对称 保真度
• 年，卷（期）: 2010,（10）
• 页码范围: 15-18
• 页数: 4页
• 分类号: TP273 Q78
• 语种: 英文

摘要

We present explicit unitary transformations for realizing both symmetric and asymmetric one-to-many economical phase-covariant clonings of qudits. We also propose a corresponding telecloning scheme. It is shown that the fidelity of the telecloning with nonmaximally entangled states can be larger than that of the corresponding cloning. This implies that partially entangled states can be better than the maximally entangled states for our economical phase-covariant telecloning scheme.