简介

  在量子网络中，我们把三个纠缠光脉冲存储到三个原子系综实现了空间分离的三个量子节点的之间的量子纠缠。其次，我们在光纤量子通道中实现了远距离的纠缠分发，并且在此基础上完成了6公里的确定性量子隐形传态。最后，我们在实验制备的多组份束缚态基础上实现了四用户的量子秘密共享。在量子测量方面，我们理论提出并且实验构建了一种包含两个光学参量放大器的量子干涉仪，通过同时放大相敏场强和压缩量子噪声实现了超越量子噪声极限的确定性相位测量。

Xiaojie Zuo, Zhihui Yan, Yanni Feng, Jingxu Ma, Xiaojun Jia, Changde Xie and Kunchi Peng

We propose and experimentally demonstrate a compact quantum interferometer involving two optical parametric amplifiers and the squeezed states generated within the interferometer are directly used for the phase-sensing quantum state. By both squeezing shot noise and amplifying phase-sensing intensity the sensitivity beyond the standard quantum limit is deterministically realized and a minimum detectable phase smaller than that of all present interferometers under the same phase-sensing intensity is achieved. This interferometric system has significantly potential applications in a variety of measurements for tiny variances of physical quantities.

Phys. Rev. Lett. 124, 173602 (2020)   PDF

Meiru Huo, Jiliang Qin, Jialin Cheng, Zhihui Yan, Zhongzhong Qin, Xiaolong Su, Xiaojun Jia, Changde Xie, and Kunchi Peng

  We experimentally demonstrate deterministic quantum teleportation of an optical coherent state through fiber channels. Two sub-modes of an Einstein-Podolsky-Rosen entangled state are distributed to a sender and a receiver through a 3.0-km fiber, which acts as a quantum resource. The deterministic teleportation of optical modes over a fiber channel of 6.0 km is realized. A fidelity of 0.62 ± 0.03 is achieved for the retrieved quantum state, which breaks through the classical limit of 1/2. Our work provides a feasible scheme to implement deterministic quantum teleportation in communication networks.

Sci. Adv. 4: eaas9401 (2018)  PDF

Yaoyao Zhou, Juan Yu, Zhihui Yan, Xiaojun Jia, Jing Zhang, Changde Xie, and Kunchi Peng

  We design and experimentally demonstrate a quantum secret sharing (QSS) protocol, where the dealer modulates a secret on a four-partite bound entanglement (BE) state and then distributes the submodes of the BE state to four spatially separated players. The presented QSS scheme has the capability to protect secrets from eavesdropping and dishonest players, because a nonlocal and deterministic BE state is shared among four authorized players.

Phys. Rev. Lett. 121, 150502 (2018)  PDF

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

  We present an experimental demonstration on generation, storage, and transfer of deterministic quantum entanglement among three spatially separated atomic ensembles. The off-line prepared multipartite entanglement of optical modes is mapped into three distant atomic ensembles to establish entanglement of atomic spin waves via electromagnetically induced transparency light–matter interaction. Then the stored atomic entanglement is transferred into a tripartite quadrature entangled state of light, which is space-separated and can be dynamically allocated to three quantum channels for conveying quantum information.

Nature Communications 8,718 (2017)  PDF