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Chin. Phys. B, 2014, Vol. 23(4): 044202    DOI: 10.1088/1674-1056/23/4/044202
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Quadripartite entangled state from cascaded second-harmonic generation

Yang Ruia, Zhai Shu-Qina b, Yang Rong-Guoa b
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
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.
Keywords:  harmonic generation      nonlinear optics      quantum optics      quantum communication  
Received:  16 February 2013      Revised:  04 September 2013      Accepted manuscript online: 
PACS:  42.50.-p (Quantum optics)  
  42.65.-k (Nonlinear optics)  
  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
Fund: 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).
Corresponding Authors:  Zhai Shu-Qin     E-mail:  xiaozhai@sxu.edu.cn
About author:  42.50.-p; 42.65.-k; 42.65.Ky

Cite this article: 

Yang Rui, Zhai Shu-Qin, Yang Rong-Guo Quadripartite entangled state from cascaded second-harmonic generation 2014 Chin. Phys. B 23 044202

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