The mechanism of producing energy-polarization entangled photon pairs in the cavity-quantum electrodynamics scheme |
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Authors: | Shu Chang-Gan Xin Xia Liu Yu-Min Yu Zhong-Yuan Yao Wen-Jie Wang Dong-Lin Cao Gui |
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Institution: | State Key Laboratory of Information Photonics and Optical Communications (Ministry of Education), Beijing University of Posts and Telecommunications, Beijing 100876, China |
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Abstract: | We investigate theoretically two photon entanglement processes in a photonic-crystal cavity embedding a quantum dot in the strong-coupling regime. The model proposed by Johne et al. (Johne R, Gippius N A, Pavlovic G, Solnyshkov D D, Shelykh I A and Malpuech G 2008 Phys. Rev. Lett. 100 240404), and by Robert et al. (Robert J, Gippius N A and Malpuech G 2009 it Phys. Rev. B 79 155317) is modified by considering irreversible dissipation and incoherent continuous pumping for the quantum dot, which is necessary to connect the realistic experiment. The dynamics of the system is analysed by employing the Born-Markov master equation, through which the spectra for the system are computed as a function of various parameters. By means of this analysis the photon-reabsorption process in the strong-coupling regime is first observed and analysed from the perspective of radiation spectrum and the optimal parameters for observing energy-entangled photon pairs are identified. |
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Keywords: | cavity-quantum electrodynamics scheme entangled photon pairs pure dephasing incoherent pumping |
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