Storing a single photon as a spin wave entangled with a flying photon in the telecommunication bandwidth

Wei Zhang, Dong-Sheng Ding, Shuai Shi, Yan Li, Zhi-Yuan Zhou, Bao-Sen Shi, and Guang-Can Guo
Phys. Rev. A 93, 022316 – Published 11 February 2016

Abstract

Quantum memory is an essential building block for quantum communication and scalable linear quantum computation. Storing two-color entangled photons with one photon being at the telecommunication (telecom) wavelength while the other photon is compatible with quantum memory has great advantages toward the realization of the fiber-based long-distance quantum communication with the aid of quantum repeaters. Here, we report an experimental realization of storing a photon entangled with a telecom photon in polarization as an atomic spin wave in a cold atomic ensemble, thus establishing the entanglement between the telecom-band photon and the atomic-ensemble memory in a polarization degree of freedom. The reconstructed density matrix and the violation of the Clauser-Horne-Shimony-Holt inequality clearly show the preservation of quantum entanglement during storage. Our result is very promising for establishing a long-distance quantum network based on cold atomic ensembles.

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  • Received 13 September 2015
  • Revised 9 December 2015

DOI:https://doi.org/10.1103/PhysRevA.93.022316

©2016 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Wei Zhang, Dong-Sheng Ding*, Shuai Shi, Yan Li, Zhi-Yuan Zhou, Bao-Sen Shi, and Guang-Can Guo

  • Key Laboratory of Quantum Information, CAS, 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

  • *Corresponding author: dds@ustc.edu.cn
  • drshi@ustc.edu.cn

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Issue

Vol. 93, Iss. 2 — February 2016

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