非经典光场产生与应用实验室

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简介

  具有正交振幅和正交位相分量量子关联的纠缠态光场已经被广泛应用于量子离物传态,量子密集编码,量子纠缠交换等连续变量量子信息中。为了实现高质量的信息传递和远距离的量子通信,必须首先获得具有高关联度的纠缠态光场。我们通过纠缠态光场操控的方法实现EPR纠缠态光场纠缠度的提高,最近我们将纠缠态光场的纠缠度由初始的5.3dB提高至8.1dB。最近我们通过改进非简并光学参量放大器器件,将单个非简并光学参量放大器直接输出的EPR纠缠态光场的纠缠度提高至8.4dB,达到当前国际单腔直接输出的EPR纠缠态光场最好指标。
  为了构建一个真正实用的连续变量量子通信网络,首先需要将与原子存储,光纤传输等不同要求的波长的光场纠缠起来,我们利用级联非简并光学参量振荡器实验制备了分别与光纤传输及原子存储相匹配的三色三组份纠缠态光场 。此外我们把三个纠缠光脉冲存储到三个原子系综,实现了三个原子系综的纠缠。

近期研究工作:  

Experimental generation of tripartite polarization entangled states of bright optical beams

Liang Wu, Zhihui Yan, Yanhong Liu, Ruijie Deng, Xiaojun Jia, Changde Xie, and Kunchi Peng

  We present the experimental demonstration of tripartite polarization entanglement described by Stokes operators of optical field. The tripartite entangled states of light at the frequency resonant with D1 line of Rubidium atoms are transformed into the continuous variable polarization entanglement among three bright optical beams via an optical beam splitter network.

App. Phys. Lett.,108, 161102 (2016)       PDF

guanglu

Experimental generation of 8.4 dB entangled state with an optical
cavity involving a wedged type-II nonlinear crystal

 
Yaoyao Zhou, Xiaojun Jia, Fang Li,
Changde Xie, and Kunchi Peng
 
     We have designed and built an efficient and compact light source of entangled state, which is a non-degenerate optical parametric amplifier (NOPA) with the triple resonance of the pump and two subharmonic modes. A wedged type-II KTP crystal inside the NOPA is used for implementing frequency-down-conversion of the pump field to generate the optical entangled state with quantum correlations of 8.4 dB for both amplitude and phase quadratures and achieving the dispersion compensation between the pump and the subharmonic waves...  

Opt. Express, 23, 4953-4959 (2015)    PDF

Superactivation of Multipartite Unlockable Bound Entanglement

Xiaojun Jia, Jing Zhang, Yu Wang , Yaping Zhao, Changde Xie, and Kunchi Peng

      Here we present the first experimental realization of the superactivation of the BE state, in which two copies of the four-partite unlockable BE state in a continuous-variable regime are used. Coupling two thermal states with Gaussian noises into two submodes of an EPR entangled state on two 50-50 beam splitters respectively, the four output optical modes form a four-partite unlocklable BE state. Using two EPR entangled states, we experimentally produce two BE states first. Then...

Phys. Rev. Lett., 108, 190501 (2012)                  PDF

prl

Experimental realization of three-color entanglement at optical fiber communication and atomic storage wavelengths

Xiaojun Jia, Zhihui Yan, Zhiyuan Duan, Xiaolong Su, Hai Wang, Changde Xie and Kunchi Peng

      We present the experimental achievement on the three-color entanglement generation at 852 nm, 1550 nm and 1440 nm wavelengths for optical continuous variables. The entanglement generation system consists of two cascaded non-degenerated optical parametric oscillators (NOPOs). The flexible selectivity of nonlinear crystals in the two NOPOs and the tunable property of NOPO provide large freedom for the frequency selection of three entangled optical beams. The presented system is hopeful to be developed as a practical entangled source used in quantum information networks with atomic storage units and long fiber transmission lines...   

Phys. Rev. Lett., 109, 253604 (2012)         PDF

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