Compression of correlation time of chirped biphotons by binary phase modulation

NTSC-IR > 量子频标研究室

	Compression of correlation time of chirped biphotons by binary phase modulation
	Li BH(李百宏)1; Wang DD(王豆豆)2; Pang HF(庞华锋)2; Zhang T(张涛)2; Jie Y(解忧)2; Gao F(高峰)2; Dong RF(董瑞芳)1; Li YF(李永放)3; Zhang SG(张首刚)1
	2017
发表期刊	ACTA PHYSICA SINICA
ISSN	1000-3290
卷号	66 期号:4
摘要	Chirped biphotons generated via spontaneous parametric down-conversion in chirped quasi-phase-matched nonlinear crystals have ultrabroadband frequency spectra. However, the presence of quadratic frequency phase factor restricts their applications in quantum metrology and quantum lithography due to simultaneously lengthening the correlation times of biphotons. The key point to improve the temporal correlation of chirped biphotons is how to compensate for or remove the quadratic frequency phase factor. Phase compensation methods have been demonstrated to solve this problem in earlier reports. But the compressed efficiencies of these methods are strongly dependent on the length of the utilized dispersive medium and decreased by the higher-order dispersion of the dispersive medium. In this paper, based on the phase transform of a lens for a light field in spatial domain, we theoretically propose a method of the equivalent removal of the quadratic phase by realizing a Fresnel-zone lens-like modulation on the biphotons spectrum in frequency domain, thereby compressing the correlation time of chirped biphotons to the Fourier-transform limited width. By analogy to the idea of Fresnel wave zone plate, this lens-like modulation can be realized by dividing the biphoton spectrum into Fresnel frequency zones and applying only binary spectral phase (0, pi) sequentially to these zones. The theoretical results show that the correlation time width of chirped biphotons can be reduced, and the correlation signal intensity can be increased compared with the original one, by a factor about 100 and 30, respectively. The physical reason is that these Fresnel frequency zones under binary spectral phase modulation will lead to constructive interference at zero delay and destructive interference elsewhere. This method can significantly enhance biphoton time correlation without biphoton signal loss and avoids the limitations of phase compensation methods. Therefore, we can obtain biphotons with both ultra-broad bandwidth and ultra-short correlation times by using our proposed method. The attainable compression efficiency is constrained by the division resolution of the Fresnel frequency zones and the precision of applied binary phase modulations. It should be noted that a constraint condition about crystal length, chirp parameter and the number of frequency zones is summarized in designing the experimental parameters for the desired compression goal. Since binary spectral phase pi and 0 are easy to obtain and calibrate in practice, we thus believe that our proposed method is feasible to implement experimentally. Moreover, the proposed method can also be generalized to other fields relating to the quadratic phase factor, such as two-photon absorption, second-harmonic generation and chirped pulse compression.
关键词	PARAMETRIC DOWNCONVERSION 2-PHOTON ABSORPTION AXIAL RESOLUTION GENERATION ULTRABROADBAND FLUORESCENCE ENTANGLEMENT ENERGY LIGHT chirped biphotons correlation times compression binary phase modulation
语种	英语
资助项目	[National Natural Science Foundation of China] ; ["Young Top-notch Talents" Program of Organization Department of the CPC Central Committee, China] ; [CAS Frontier Science Key Research Project] ; [Natural Science Basic Research Plan in Shaanxi Province of China] ; [Research Foundation for the Excellent Returned Overseas Chinese Scholars of Shaanxi Province, China]
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/9849
专题	量子频标研究室
作者单位	1.中国科学院国家授时中心 2.西安科技大学 3.陕西师范大学
第一作者单位	中国科学院国家授时中心
推荐引用方式 GB/T 7714	Li BH,Wang DD,Pang HF,et al. Compression of correlation time of chirped biphotons by binary phase modulation[J]. ACTA PHYSICA SINICA,2017,66(4).
APA	李百宏.,王豆豆.,庞华锋.,张涛.,解忧.,...&张首刚.(2017).Compression of correlation time of chirped biphotons by binary phase modulation.ACTA PHYSICA SINICA,66(4).
MLA	李百宏,et al."Compression of correlation time of chirped biphotons by binary phase modulation".ACTA PHYSICA SINICA 66.4(2017).