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.

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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