Optical-frequency-comb generation and entanglement with low-power optical input in a photonic molecule

Jiahua Li, Rong Yu, Chunling Ding, Wei Wang, and Ying Wu
Phys. Rev. A 90, 033830 – Published 19 September 2014

Abstract

Optical-frequency combs consisting of equally spaced sharp lines in frequency space have triggered substantial advances in optical-frequency metrology and precision measurements and in applications such as laser-based gas sensing and molecular fingerprinting. Here, we propose a scheme to generate a type of optical-frequency combs and convert them from one cavity to the other in a hybrid optical system composed of a pair of coupled photonic crystal cavities called a photonic molecule (PM) and a single semiconductor quantum dot (QD) embedded in one cavity of the molecule. Optical-frequency combs are formed by the interaction between a cavity mode and a continuous-wave (CW) two-tone driving laser consisting of a pump field and a seed field via QD-induced strong nonlinearity. In this situation, the initial input pump and seed CW lasers can interact among each other and produce optical higher-order sidebands with equal spacing via parametric frequency conversion provided by QD-induced nonlinear optical effects. Using numerical simulations, it is clearly shown that the beat frequency of the two-tone components plays an important role in determining the comb spacing and matched frequency combs can be formed in the PM. We also demonstrate that the present interacting QD-PM system can serve as a platform to generate large-scale quantum entanglement between two comb modes. The results obtained here may be useful for real experiments in a photonic crystal platform.

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  • Received 17 June 2014

DOI:https://doi.org/10.1103/PhysRevA.90.033830

©2014 American Physical Society

Authors & Affiliations

Jiahua Li1,2, Rong Yu3,*, Chunling Ding4, Wei Wang1, and Ying Wu1,†

  • 1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
  • 2Key Laboratory of Fundamental Physical Quantities Measurement of Ministry of Education, Wuhan 430074, People's Republic of China
  • 3School of Science, Hubei Province Key Laboratory of Intelligent Robot, Wuhan Institute of Technology, Wuhan 430073, People's Republic of China
  • 4School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China

  • *Author to whom correspondence should be addressed: rong_yu2013@163.com
  • yingwu2@126.com

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Vol. 90, Iss. 3 — September 2014

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