Abstract

We experimentally realized the two-photon entangled state with correlated momentum and anticorrelated position, namely, the momentum positively correlated Einstein–Podolsky–Rosen (MPC-EPR) state from the spontaneous parametric downconversion process in a long periodically poled lithium tantalate (PPLT) crystal with a tightly focused pump beam. The MPC-EPR state is identified by measuring the momentum and position correlations at the Fourier plane and imaging plane of the PPLT crystal end face, respectively, showing a variance product ${(\mathrm{\Delta }{x}_{+})}^2{(\mathrm{\Delta }{p}_{-})}^2=0.14\pm 0.02{\hslash }^2$, which fulfills the entanglement criterion. The engineering of such an entangled state will bring interest to not only fundamental quantum physics but also the applied quantum technologies, such as quantum imaging, etc.

© 2015 Optical Society of America

Generation and characterization of position-momentum entangled photon pairs in a hot atomic gas cell

Chengyuan Wang, Chung-Hyun Lee, and Yoon-Ho Kim
Opt. Express 27(24) 34611-34617 (2019)

Experimental demonstration of two-color Einstein–Podolsky–Rosen entanglement in a hot vapor cell

Kai Wang, Shuai Shi, Wei Zhang, Yinghao Ye, Yichen Yu, Mingxin Dong, Yueyang Zhai, Dongsheng Ding, and Baosen Shi
OSA Continuum 2(7) 2260-2265 (2019)

Demonstrating continuous variable Einstein–Podolsky–Rosen steering in spite of finite experimental capabilities using Fano steering bounds

James Schneeloch, Samuel H. Knarr, Gregory A. Howland, and John C. Howell
J. Opt. Soc. Am. B 32(4) A8-A14 (2015)

Generation of bright visible photon pairs using a periodically poled stoichiometric lithium tantalate crystal

Hee Jung Lee, Heonoh Kim, Myoungsik Cha, and Han Seb Moon
Opt. Express 23(11) 14203-14210 (2015)

Decoherence of Einstein–Podolsky–Rosen steering

L. Rosales-Zárate, R. Y. Teh, S. Kiesewetter, A. Brolis, K. Ng, and M. D. Reid
J. Opt. Soc. Am. B 32(4) A82-A91 (2015)