Journal
OPTICS EXPRESS
Volume 23, Issue 22, Pages 28792-28800Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.028792
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Funding
- National Fundamental Research Program of China [2011CBA00200]
- National Natural Science Foundation of China (NSFC) [11174271, 61275115, 10874171]
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Polarization entangled photon pair source is widely used in many quantum information processing applications such as teleportation, quantum communications, quantum computation and high precision quantum metrology. We report on the generation of a continuous-wave pumped 1550 nm polarization entangled photon pair source at telecom wavelength using a type-II periodically poled KTiOPO4 (PPKTP) crystal in a Sagnac interferometer. Hong-Ou-Mandel (HOM) interference measurement yields signal and idler photon bandwidth of 2.4 nm. High quality of entanglement is verified by various kinds of measurements, for example two-photon interference fringes, Bell inequality and quantum states tomography. The source can be tuned over a broad range against temperature or pump power without loss of visibilities. This source will be used in our future experiments such as generation of orbital angular momentum entangled source at telecom wavelength for quantum frequency up-conversion, entanglement based quantum key distributions and many other quantum optics experiments at telecom wavelengths. (C) 2015 Optical Society of America
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