Entanglement Enhancement from a Two-Port Feedback Optical Parametric Amplifier

被引：15

作者：

Xin, Jun ^{[1
]}

Pan, Xiaozhou ^{[1
]}

Lu, Xiao-Ming ^{[1
,2
]}

Kong, Jia ^{[1
]}

Li, Guolong ^{[1
]}

Li, Xingmin ^{[1
]}

机构：

[1] Hangzhou Dianzi Univ, Dept Phys, Hangzhou 310018, Peoples R China

[2] Chinese Acad Sci, Key Lab Quantum Opt, Shanghai 200800, Peoples R China

来源：

PHYSICAL REVIEW APPLIED | 2020年 / 14卷 / 02期

基金：

中国国家自然科学基金;

关键词：

CONTINUOUS VARIABLE ENTANGLEMENT; PODOLSKY-ROSEN PARADOX; QUANTUM CRYPTOGRAPHY; INFORMATION; GENERATION; CRITERION;

D O I：

10.1103/PhysRevApplied.14.024015

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

How to achieve the maximal entanglement, for given finite entanglement resources? In this paper, we propose a two-port feedback optical parametric amplifier (TFPA) consisting of a nondegenerate optical parametric amplifier (NOPA) and two linear beam splitters. The former is an entanglement resource, and the latter serve as feedback controllers that feed the two entangled beams generated from the NOPA back into its input ports. By manipulating the reflectivity of the beam splitters and the phase delays introduced by the feedback paths, an entanglement enhancement can be achieved by the TFPA. Furthermore, we demonstrate that such entanglement enhancement can happen at all phase points for the ideal case, and the maximal entanglement can be infinitely large. For the lossy case, our TFPA also has its unique advantages in the robustness of the losses of the system.

引用

页数：8

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