Fujiwara Mikio, Wakabayashi Ryota, Sasaki Masahide, Takeoka Masahiro
Opt Express. 2017 Feb 20;25(4):3445-3453. doi: 10.1364/OE.25.003445.
We report a wavelength division multiplexed time-bin entangled photon pair source in telecom wavelength using a 10 μm radius Si ring resonator. This compact resonator has two add ports and two drop ports. By pumping one add port by a continuous laser, we demonstrate an efficient generation of two-wavelength division multiplexed time-bin entangled photon pairs in the telecom C-band, which come out of one drop port, and are then split into the signal and idler photons via a wavelength filter. The resonator structure enhances four-wave mixing for pair generation. Moreover, we demonstrate the double-port pumping where two counter propagating pump lights are injected to generate entanglement from the two drop ports simultaneously. We successfully observe the highly entangled outputs from both two drop ports. Surprisingly, the count rate at each drop port is even increased by twice that of the single-port pumping. Possible mechanisms of this observation are discussed. Our technique allows for the efficient use of the Si ring resonator and widens its functionality for variety of applications.
我们报道了一种使用半径为10μm的硅环形谐振器的电信波长下的波分复用时间-bin纠缠光子对源。这种紧凑的谐振器有两个添加端口和两个下路端口。通过用连续激光泵浦一个添加端口，我们展示了在电信C波段高效产生两个波分复用时间-bin纠缠光子对，它们从一个下路端口输出，然后通过波长滤波器被分成信号光子和闲置光子。谐振器结构增强了用于对产生的四波混频。此外，我们展示了双端口泵浦，即注入两个反向传播的泵浦光以同时从两个下路端口产生纠缠。我们成功地观察到了来自两个下路端口的高度纠缠输出。令人惊讶的是，每个下路端口的计数率甚至比单端口泵浦时提高了两倍。讨论了这种观察结果的可能机制。我们的技术允许有效利用硅环形谐振器，并拓宽其在各种应用中的功能。
