Efficient Preparation of Position‐Momentum Entanglement Based on Spontaneous Parametric Down‐Conversion

Kai Wang; Tianyu Mao; Rongshi Chen; Fei Han; Nanxiang Zhao; Xinyuan Zhang; Qingli Ma; Shilong Xu; Yihua Hu

doi:10.3788/CJL240902

Chinese Journal of Lasers, Volume. 52, Issue 2, 0212002(2025)

Efficient Preparation of Position‐Momentum Entanglement Based on Spontaneous Parametric Down‐Conversion

Kai Wang^1,2, Tianyu Mao^1,2, Rongshi Chen^1,2, Fei Han^1,2, Nanxiang Zhao^1,2, Xinyuan Zhang^1,2, Qingli Ma^1,2、***, Shilong Xu^1,2、**, and Yihua Hu^1,2、*

Author Affiliations

¹State Key Laboratory of Pulsed Power Laser Technology, Electronic Engineering Institute, National University of Defense Technology, Hefei 230037, Anhui , China

²Anhui Province Key Laboratory of Electronic Restriction, Electronic Engineering Institute, National University of Defense Technology, Hefei 230037, Anhui , China

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Figures & Tables(5)

Fig. 1. Calculation results of Ⅱ-type PPKTP. (a) Relationship between temperature and nonlinear radiation intensity when fixing pump wavelength and crystal period; (b) bandwidth curve of correlated photon pairs with fixed temperature and period

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Fig. 2. Schematic of experimental structure for EPR entanglement preparation and characterization

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Fig. 3. Two-photo time-correlated function

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Fig. 4. EPR entanglement patterns. (a) Ghost imaging; (b) ghost interference

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Table 1. Uncertainties for EPR entanglement in different schemes
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Table 1. Uncertainties for EPR entanglement in different schemes
Entanglement source （Δp）²（Δx）²/ћ²
BBO^［11］ 0.01±0.0004
Cold atoms^［13］ 0.000208±0.000177
Hot atoms 1^［15］ 0.0159±0.0109
Hot atoms 2^［16］ 0.0004
This work 0.00443±0.00021

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Kai Wang, Tianyu Mao, Rongshi Chen, Fei Han, Nanxiang Zhao, Xinyuan Zhang, Qingli Ma, Shilong Xu, Yihua Hu. Efficient Preparation of Position‐Momentum Entanglement Based on Spontaneous Parametric Down‐Conversion[J]. Chinese Journal of Lasers, 2025, 52(2): 0212002

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