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Applied Physics B

, Volume 118, Issue 3, pp 431–437 | Cite as

Characterization of frequency entanglement under extended phase-matching conditions

  • Runai Quan
  • Mengmeng Wang
  • Feiyan Hou
  • Zhaoyang Tai
  • Tao Liu
  • Shougang Zhang
  • Ruifang Dong
Article

Abstract

Frequency-entangled photon pairs generated by spontaneous parametric down-conversion process under extended phase-matching conditions are found to be prospective resources for quantum information technology. The spectral indistinguishability and the degree of frequency entanglement of the down-converted photon pairs are two key features determining their potential applications. In this paper, both figures of merits are investigated. It is shown that the broadening of the pulsed pump bandwidth, the chirping of the pulse duration, and the lengthening of the nonlinear crystal all degrade the spectral indistinguishability. Furthermore, by changing the above conditions, it is possible to transfer the entanglement type from frequency-correlated to frequency-anticorrelated. For frequency-correlated entanglement, the degree of entanglement grows linearly with the pump bandwidth and the nonlinear crystal length, and quadratically with the chirp parameter of the pulse, while for anticorrelated frequency entanglement, the degree of frequency entanglement turns to behave with an inverse dependence on the above parameters. Guided by such investigations, the generation of desired frequency-entangled source for various quantum information applications can be optimized.

Keywords

Pulse Pump Photon Pair Crystal Length Entangle Photon Pair Converted Photon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11174282, 91336108, 61127901), the Youth Talent Support Plan of the Organization Department of China, the Key Fund for the “Western light” Talent Cultivation Plan of the CAS, China, and the “Cross and Cooperative” Science and Technology Innovation Team Project of the CAS, China.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Runai Quan
    • 1
  • Mengmeng Wang
    • 1
    • 2
  • Feiyan Hou
    • 1
  • Zhaoyang Tai
    • 1
    • 2
  • Tao Liu
    • 1
  • Shougang Zhang
    • 1
  • Ruifang Dong
    • 1
  1. 1.Key Laboratory of Time and Frequency Primary Standards, National Time Service CenterChinese Academy of SciencesXi’anChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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