Quantum-state cloning in the presence of a closed timelike curve

被引：24

作者：

Ahn, D. ^{[1
]}

Myers, C. R. ^{[2
]}

Ralph, T. C. ^{[3
]}

Mann, R. B. ^{[4
]}

机构：

[1] Univ Seoul, Ctr Quantum Informat Proc, Dept Elect & Comp Engn, Seoul 130743, South Korea

[2] Univ Queensland, Ctr Engn Quantum Syst, Sch Math & Phys, St Lucia, Qld 4072, Australia

[3] Univ Queensland, Ctr Quantum Computat & Commun Technol, Sch Math & Phys, St Lucia, Qld 4072, Australia

[4] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

来源：

PHYSICAL REVIEW A | 2013年 / 88卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

MECHANICS; CANNOT;

D O I：

10.1103/PhysRevA.88.022332

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Using the Deutsch model of closed timelike curves, we show that a universal cloner can be constructed that when acting on a completely arbitrary qubit state, exceeds the no-cloning bound for fidelity. Since the no-cloning theorem has played a central role in the development of quantum information science, it is clear that the existence of closed timelike curves that behave according to Deutsch's model would radically change the rules for quantum information technology. Nevertheless, we show that this type of cloning does not violate no-signaling criteria.

引用

页数：5

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