中国物理B ›› 2014, Vol. 23 ›› Issue (4): 44202-044202.doi: 10.1088/1674-1056/23/4/044202

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Quadripartite entangled state from cascaded second-harmonic generation

杨瑞a, 翟淑琴a b, 杨荣国a b   

  1. a College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China;
    b State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2013-02-16 修回日期:2013-09-04 出版日期:2014-04-15 发布日期:2014-04-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61008006, 61108003, and 11274210) and the State Key Basic Research and Development Plan of China (Grant No. 2010CB923102).

Quadripartite entangled state from cascaded second-harmonic generation

Yang Rui (杨瑞)a, Zhai Shu-Qin (翟淑琴)a b, Yang Rong-Guo (杨荣国)a b   

  1. a College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China;
    b State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • Received:2013-02-16 Revised:2013-09-04 Online:2014-04-15 Published:2014-04-15
  • Contact: Zhai Shu-Qin E-mail:xiaozhai@sxu.edu.cn
  • About author:42.50.-p; 42.65.-k; 42.65.Ky
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61008006, 61108003, and 11274210) and the State Key Basic Research and Development Plan of China (Grant No. 2010CB923102).

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摘要： A generation system of continuous-variable (CV) quadripartite entangled state based on two cascaded second-harmonic generation (SHG) cavities below the threshold is investigated. Two reflected fundamental beams of the first cavity, the reflected second-harmonic beam and the output fourth-harmonic beam of the second cavity are proved to be entangled, and the dependence of the entanglement degree on the normalized frequency, pump parameter, fourth-harmonic loss parameter, and second-harmonic loss parameter is also analyzed. Due to the fact that the cavity parameters and the nonlinear crystals of the two SHG cavities can be freely chosen, the practicality of the proposed protocol is relatively perfect and the system can also be extended to the preparation of multicolor entangled states for a quantum network.

关键词: harmonic generation, nonlinear optics, quantum optics, quantum communication

Abstract: A generation system of continuous-variable (CV) quadripartite entangled state based on two cascaded second-harmonic generation (SHG) cavities below the threshold is investigated. Two reflected fundamental beams of the first cavity, the reflected second-harmonic beam and the output fourth-harmonic beam of the second cavity are proved to be entangled, and the dependence of the entanglement degree on the normalized frequency, pump parameter, fourth-harmonic loss parameter, and second-harmonic loss parameter is also analyzed. Due to the fact that the cavity parameters and the nonlinear crystals of the two SHG cavities can be freely chosen, the practicality of the proposed protocol is relatively perfect and the system can also be extended to the preparation of multicolor entangled states for a quantum network.

Key words: harmonic generation, nonlinear optics, quantum optics, quantum communication

中图分类号:  (Quantum optics)

  • 42.50.-p
42.65.-k (Nonlinear optics) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)