Quantum Storage of Orbital Angular Momentum Entanglement in an Atomic Ensemble
Dong-Sheng Dinga b c, Wei Zhanga b c, Zhi‐Yuan Zhoua b c, Shuai Shia b c, Guo‐Yong Xianga b c, Xi-Shi Wangd, Yun-Kun Jiange, Bao‐Sen Shia b c, Guang‐Can Guoa b c
- aKey Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- bKey Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China
- cSynergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- dState Key Laboratory of Fire Science, University of Science & Technology of China, Hefei, Anhui 230026, China
- eCollege of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, People's Republic of China
Papers open inside SciRah from the original publisher or repository; SciRah never hosts them.
Abstract
Constructing a quantum memory for a photonic entanglement is vital for realizing quantum communication and network. Because of the inherent infinite dimension of orbital angular momentum (OAM), the photon's OAM has the potential for encoding a photon in a high-dimensional space, enabling the realization of high channel capacity communication. Photons entangled in orthogonal polarizations or optical paths had been stored in a different system, but there have been no reports on the storage of a photon pair entangled in OAM space. Here, we report the first experimental realization of storing an entangled OAM state through the Raman protocol in a cold atomic ensemble. We reconstruct the density matrix of an OAM entangled state with a fidelity of 90.3%±0.8% and obtain the Clauser-Horne-Shimony-Holt inequality parameter S of 2.41±0.06 after a programed storage time. All results clearly show the preservation of entanglement during the storage.
TL;DRThis work reports the first experimental realization of storing an entangled OAM state through the Raman protocol in a cold atomic ensemble and reconstruct the density matrix of an OAM entangled state with a fidelity of 90.3%±0.8% and the preservation of entanglement during the storage. (Semantic Scholar)