Tomography of the temporal-spectral state of subnatural-linewidth single photons from atomic ensembles

ORAL

Abstract

The temporal mode of a single photon is considered more and more important in quantum information processing. On one hand, qubits or multi-dimension qudits can be constructed in photonic temporal mode, which are advantageous in long-distance transportation compared to other degrees of freedom, and thus have important applications in photonic quantum processing. On the other hand, to achieve a maximum efficiency in quantum memory, the temporal mode of a single photon is important in the matter-light coupling. Here we utilize cavity-free homodyne detection scheme for reconstructing the temporal density matrix of the subnatural-linewidth single photons generated from a cold atomic cloud. The characterization of the pure temporal-spectral state of narrowband single photons paves the way for exploiting the temporal-spectral degree of freedom to develop photonic quantum information processing.

*This work is supported by the National Key Research and Development Program of China under Grant number 2016YFA0302001, and the National Natural Science Foundation of China through Grant No. 11674100, 11654005, 11234003, and also it is supported the ECNU Fund for International Conferences.

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Presenters

  • Ce Yang

    • Department of Physics,East China Normal University, Shanghai 200241, China, Quantum Institute for Light and Atoms

Authors

  • Ce Yang

    • Department of Physics,East China Normal University, Shanghai 200241, China, Quantum Institute for Light and Atoms

  • Zhenjie Gu

    • Department of Physics,East China Normal University, Shanghai 200241, China, Quantum Institute for Light and Atoms

  • Peng Chen

    • Department of Physics,East China Normal University, Shanghai 200241, China, Quantum Institute for Light and Atoms

  • Zhongzhong Qin

    • Shanxi University, Taiyuan, Shanxi 030006, China, Collaborative Innovation Center of Extreme Optics,

  • JieFei Chen

    • Department of Physics,East China Normal University, Shanghai 200241, China, Quantum Institute for Light and Atoms

  • Weiping Zhang

    • Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China, Tsung-Dao Lee Institute