Effect of source statistics on utilizing photon entanglement in quantum key distribution

被引：9
|
作者：
Hosak, Radim [1 ]
Straka, Ivo [1 ]
Predojevic, Ana [2 ]
Filip, Radim [1 ]
Jezek, Miroslav [1 ]
机构：
[1] Palacky Univ, Dept Opt, 17 Listopadu 12, Olomouc 77146, Czech Republic
[2] Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden
来源：
PHYSICAL REVIEW A | 2021年 / 103卷 / 04期
基金：
欧盟地平线“2020”;
关键词：
BELL-INEQUALITY VIOLATION;
D O I：
10.1103/PhysRevA.103.042411
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A workflow for evaluation of entanglement source quality is proposed. Based on quantum state density matrices obtained from theoretical models and experimental data, we make an estimate of a potential performance of a quantum entanglement source in quantum key distribution protocols. This workflow is showcased for continuously pumped spontaneous parametric down-conversion (SPDC) source, where it highlights the trade-off between entangled pair generation rate and entanglement quality caused by multiphoton nature of the generated quantum states. We employ this characterization technique to show that secure key rate of down-converted photon pairs is limited to 0.029 bits per detection window due to intrinsic multiphoton contributions. We also report that there exists one optimum gain for continuous-wave down-conversion sources. We find a bound for secure key rate extracted from SPDC sources and make a comparison with perfectly single-pair quantum states, such as those produced by quantum dots.
引用
收藏
页数：12
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