Realization of double resonance for a bright frequency-tunable source of narrowband entangled photons

doi:10.1088/1674-1056/20/2/024202

Abstract In this paper, we report an interesting phenomenon when precisely adjust the tuning crystal for double-resonance of a type-II configured parametric amplifier cavity, which is later verified as a cavity-enhanced effect in optics alignment. The theoretical result indicates that an angle accuracy error within 0.09^o is necessary to achieve a high contrast ratio of 100:1 for a cavity with a finesse of about 205, which is crucial but high-demanding to get a high-quality narrowband entanglement source. Meanwhile, we figure out a method to release such a high requirement and get high visibility in a moderate-accuracy alignment.

Keywords: optics alignment double-resonance cavity-enhanced narrowband entanglement

Received: 03 December 2010
Revised: 03 December 2010
Accepted manuscript online:

PACS:	42.50.Nn	(Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)
	42.50.Ex	(Optical implementations of quantum information processing and transfer)
	03.67.Bg	(Entanglement production and manipulation)

Fund: Project supported by the Science Foundation of the Chinese Academy of Sciences, the National Fundamental Research Program of China (Grant No. 2011CB921300) and the National Natural Science Foundation of China.

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Yang Jian(杨剑), Zhao Tian-Ming(赵天明), Zhang Han(张涵), Yang Tao(杨涛), Bao Xiao-Hui(包小辉), and Pan Jian-Wei(潘建伟) Realization of double resonance for a bright frequency-tunable source of narrowband entangled photons 2011 Chin. Phys. B 20 024202

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Realization of double resonance for a bright frequency-tunable source of narrowband entangled photons

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