Measurement of the spectral properties of the coincident-frequency entangled biphoton state at optical communication wavelength

NTSC-IR > 量子频标研究室

	Measurement of the spectral properties of the coincident-frequency entangled biphoton state at optical communication wavelength
	Wang Meng-Meng; Quan Run-Ai; Tai Zhao-Yang; Hou Fei-Yan; Liu Tao; Zhang Shou-Gang; Dong Rui-Fang
	2014
发表期刊	ACTA PHYSICA SINICA
ISSN	1000-3290
卷号	63 期号:19
摘要	The frequency entangled biphoton source generated via spontaneous parametric down-conversion (SPDC) process has found important applications in the fields of quantum clock synchronization, quantum communication, quantum information processing, etc. As quantum technologies evolve, quantitative characterization of the frequency entanglement becomes necessary and has been implemented by measuring the spectral properties of the biphoton state. However, due to the high dark rate and low quantum efficiency of the InGaAs single-photon detectors, direct measurement of the spectral properties of the biphoton state at optical communication wavelength is hard to implement. In this paper, we report the measurement of the spectral properties of a biphoton state at optical communication wavelength which is generated from periodically poled potassium titanyl phosphate (PPKTP) pumped by an ultra-short pulsed optical source at 787 nm. Based on the coincidence measurement setup together with two infrared spectrometers, the spectra of the signal and idler photons are obtained with their center wavelengths being 1574.4 nm and 1574.9 nm, while their 3-dB bandwidths being 35.3 nm and 37.6 nm respectively. The joint spectrum of the photon pair is observed as well and shows a coincident-frequency entanglement and a joint spectrum bandwidth of 3 nm. According to the ratio of the single-photon spectral bandwidth to the joint spectral bandwidth of the photon pairs, the degree of frequency entanglement is quantified to be 12, denoting a relatively high quality of the entanglement.
部门归属	量子频标研究室
收录类别	SCI
语种	中文
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/7387
专题	量子频标研究室
推荐引用方式 GB/T 7714	Wang Meng-Meng,Quan Run-Ai,Tai Zhao-Yang,et al. Measurement of the spectral properties of the coincident-frequency entangled biphoton state at optical communication wavelength[J]. ACTA PHYSICA SINICA,2014,63(19).
APA	Wang Meng-Meng.,Quan Run-Ai.,Tai Zhao-Yang.,Hou Fei-Yan.,Liu Tao.,...&Dong Rui-Fang.(2014).Measurement of the spectral properties of the coincident-frequency entangled biphoton state at optical communication wavelength.ACTA PHYSICA SINICA,63(19).
MLA	Wang Meng-Meng,et al."Measurement of the spectral properties of the coincident-frequency entangled biphoton state at optical communication wavelength".ACTA PHYSICA SINICA 63.19(2014).

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Measurement of the s（1084KB）			限制开放	CC BY-NC-SA	请求全文