標題: Beamlike photon-pair generation for two-photon interference and polarization entanglement
作者: Lo, Hsin-Pin
Yabushita, Atsushi
Luo, Chih-Wei
Chen, Pochung
Kobayashi, Takayoshi
電子物理學系
Department of Electrophysics
公開日期: 14-二月-2011
摘要: Beamlike photon pairs were generated by spontaneous parametric down-conversion using a type-II beta-BaB(2)O(4) crystal. A pump laser generated photon pairs when it transmitted through the crystal and was reflected back into the crystal by a mirror to generate more photon pairs. The photon pairs generated when the pump laser first transmitted through the crystal (first photon pairs) were also reflected back into the crystal to overlap with the light path of the photon pairs generated in the second transmission of the pump laser through the crystal (second photon pairs). We observed interference between the first and second photon pairs modulated with a half period of the wavelength of the photon pairs, which demonstrates two-photon interference using the beamlike photon pairs. The fringe period confirms that the observed interference is not classical interference but quantum two-photon interference. Through rotating the angles of quarter-wave plates in the light paths of the photon pairs, we generated beamlike photon pairs with entangled polarization. The phase between the first and second photon pairs could be tuned by changing the position of mirrors reflecting the pump pulses and photon pairs. The fringes of coincidence counts showed that the beamlike photon pairs have polarization entanglement.
URI: http://dx.doi.org/10.1103/PhysRevA.83.022313
http://hdl.handle.net/11536/9304
ISSN: 1050-2947
DOI: 10.1103/PhysRevA.83.022313
期刊: PHYSICAL REVIEW A
Volume: 83
Issue: 2
結束頁: 
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