An ultra-broadband continuously-tunable polarization-entangled photon-pair source covering the C plus L telecom bands based on a single type-II PPKTP crystal

作者：Zhou, Zhi-Yuan; Jiang, Yun-Kun^*; Ding, Dong-Sheng; Shi, Bao-Sen

来源：Journal of Modern Optics, 2013, 60(9): 720-725.

DOI：10.1080/09500340.2013.807363

• telecom band
• polarization entanglement
• Bell state

The first experimental preparation is reported of an ultra-broadband continuously-tunable highly polarization-entangled photon-pair source via spontaneous parametric down-conversion in a single type-II phase-matched bulk periodically-poled KTiOPO4 (PPKTP) crystal. A tuning band of more than 60nm for the down-converted photons is achieved experimentally, which covers the C+L telecom bands. The photon pair generation rate is about 1.63 x 10(4) (s mWnm)(-1). The calculated S parameter values of CHSH inequality between 2.60 +/- 0.04 (minimum) and 2.72 +/- 0.07 (maximum) over the whole tunable range clearly demonstrate high entanglement of the source. In combination with the dense wavelength-division multiplexing (DWDM) technique, our source could be used to enhance the transmission capacity of a communication channel in the field of quantum communication.

• 出版日期2013-5-1
• 单位福州大学; 中国科学技术大学