Surpassing the no-cloning limit with a heralded hybrid linear amplifier for coherent states

被引：72

作者：

Haw, Jing Yan ^{[1
]}

Zhao, Jie ^{[1
]}

Dias, Josephine ^{[2
]}

Assad, Syed M. ^{[1
]}

Bradshaw, Mark ^{[1
]}

Blandino, Remi ^{[2
]}

Symul, Thomas ^{[1
]}

Ralph, Timothy C. ^{[2
]}

Lam, Ping Koy ^{[1
]}

机构：

[1] Australian Natl Univ, Ctr Quantum Computat & Commun Technol, Dept Quantum Sci, Res Sch Phys & Engn, Canberra, ACT 2601, Australia

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

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

澳大利亚研究理事会;

关键词：

OPTIMAL QUANTUM CLONING; AMPLIFICATION; ENTANGLEMENT; MACHINES;

D O I：

10.1038/ncomms13222

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The no-cloning theorem states that an unknown quantum state cannot be cloned exactly and deterministically due to the linearity of quantum mechanics. Associated with this theorem is the quantitative no-cloning limit that sets an upper bound to the quality of the generated clones. However, this limit can be circumvented by abandoning determinism and using probabilistic methods. Here, we report an experimental demonstration of probabilistic cloning of arbitrary coherent states that clearly surpasses the no-cloning limit. Our scheme is based on a hybrid linear amplifier that combines an ideal deterministic linear amplifier with a heralded measurement-based noiseless amplifier. We demonstrate the production of up to five clones with the fidelity of each clone clearly exceeding the corresponding no-cloning limit. Moreover, since successful cloning events are heralded, our scheme has the potential to be adopted in quantum repeater, teleportation and computing applications.

引用

页数：7

共 60 条

[1] Unconditional quantum cloning of coherent states with linear optics [J].