利用腔量子电动力学的高保真度 heralded 单光子源。（注：“heralded”不太明确准确的中文术语，可能是“宣告式”之类的意思，具体准确意思需结合专业背景进一步确定。）

High fidelity heralded single-photon source using cavity quantum electrodynamics.

作者信息

Zhang Xin, Xu Chang, Ren Zhongzhou

机构信息

Department of Physics, Nanjing University, Nanjing, 210008, China.

School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China.

出版信息

Sci Rep. 2018 Feb 16;8(1):3140. doi: 10.1038/s41598-018-21481-z.

DOI:10.1038/s41598-018-21481-z

PMID:29453365

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5816608/

Abstract

Demands for single-photon sources are ubiquitous in quantum information processing as well as in quantum metrology. In many protocols for producing single photons, a cavity-emitter configuration is used. In such cavity quantum electrodynamical systems, the cavity can enforce a well-defined output mode for the photon and enhance its collection efficiency, while the emitter is indispensable for single photon emission. Here we show the two cavity-one two-level emitter configuration can be used to produce exclusively photon pairs, with each photon in a separate mode. Conditioning on detecting a photon in one of the modes, one heralds with high fidelity a single photon in the other mode. Counterintuitively, upon decreasing the coupling of the emitter to one of the modes, the heralding fidelity can further increase.

摘要

单光子源在量子信息处理以及量子计量学中都有广泛需求。在许多产生单光子的协议中，会采用腔 - 发射体配置。在这种腔量子电动力学系统中，腔可为光子强制规定一个明确的输出模式并提高其收集效率，而发射体对于单光子发射是不可或缺的。在此我们展示了两个腔 - 一个两能级发射体的配置可用于专门产生光子对，且每个光子处于单独的模式。基于在其中一个模式中检测到光子，就能以高保真度预示在另一个模式中有单个光子。与直觉相反的是，当降低发射体与其中一个模式的耦合时，预示保真度会进一步提高。