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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 normalized frequency, pump parameter, fourth-harmonic loss parameter and second-harmonic loss parameter is also analyzed. Due to 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 be also extended to prepare multicolor entangled states for quantum network.
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Received: 18 July 2013
Published: 31 October 2013
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| Fund: ;National Natural Youth Science Foundation of China |
Cite this article:
Quadripartite entangled state from cascaded second-harmonic generations Chin. Phys. B 0
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