利用光子数解析探测器降低预示自发参量下转换源中的 g2(0) 值

IF 0.6 4区物理与天体物理 Q4 PHYSICS, APPLIED

Low Temperature Physics Pub Date : 2024-01-11 DOI:10.1063/10.0023887

C. Bruscino, M. Ejrnaes, P. Ercolano, D. Salvoni, C. Zhang, H. Li, L. You, L. Parlato, G. P. Pepe

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引用次数: 0

摘要

单光子源（SPS）以安全的方式产生信息，在量子通信和量子密码学等领域发挥着举足轻重的作用。然而，实现理想的单光子高效发射仍是一个理论模型。这导致 SPS 中存在多光子成分，有可能危及安全性。本研究的重点是通过表征光子数分布和减轻多光子成分的影响来提高一类光源的纯度。我们建议使用光子数分辨探测器（PNRD）作为一种排除多光子贡献的技术，特别是在自发参量向下转换光源等光源中，发射的光子可以表示为双模挤压真空态。通过使用 PNRD 或单光子探测器分析二阶交叉相关函数 g2(0)，我们可以量化多光子贡献的减少。

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Reduction of g2(0) value in heralded spontaneous parametric down-conversion sources using photon number resolving detectors

Single Photon Sources (SPSs) play a pivotal role in fields such as quantum communication and quantum cryptography by generating information in a secure manner. However, realizing the ideal emission of single photons with high efficiency is still a theoretical model. This leads to the presence of multiphoton components in SPSs, which could potentially compromise security. This study focuses on enhancing the purity of a class of sources by characterizing their photon number distribution and mitigating the impact of the multiphoton components. We propose the use of Photon Number Resolving Detectors (PNRD) as a technique to exclude multiphoton contributions, particularly in sources like Spontaneous Parametric Down Conversion sources, where emitted photons can be represented as Two-Mode Squeezed Vacuum states. By analyzing the second-order cross-correlation function, g2(0), using either PNRD or Single Photon Detectors, we can quantify the reduction in multiphoton contributions.

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来源期刊

Low Temperature Physics 物理-物理：应用

CiteScore

1.20

自引率

25.00%

发文量

138

审稿时长

3 months

期刊介绍： Guided by an international editorial board, Low Temperature Physics (LTP) communicates the results of important experimental and theoretical studies conducted at low temperatures. LTP offers key work in such areas as superconductivity, magnetism, lattice dynamics, quantum liquids and crystals, cryocrystals, low-dimensional and disordered systems, electronic properties of normal metals and alloys, and critical phenomena. The journal publishes original articles on new experimental and theoretical results as well as review articles, brief communications, memoirs, and biographies. Low Temperature Physics, a translation of the copyrighted Journal FIZIKA NIZKIKH TEMPERATUR, is a monthly journal containing English reports of current research in the field of the low temperature physics. The translation began with the 1975 issues. One volume is published annually beginning with the January issues.