Zhang Ming, Feng Lan-Tian, Zhou Zhi-Yuan, Chen Yang, Wu Hao, Li Ming, Gao Shi-Ming, Guo Guo-Ping, Guo Guang-Can, Dai Dao-Xin, Ren Xi-Feng
1State Key Laboratory for Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, Zhejiang Provincial Key Laboratory for Sensing Technologies, College of Optical Science and Engineering, Zhejiang University, Zijingang Campus, Hangzhou, 310058 China.
2Ningbo Research Institute, Zhejiang University, Ningbo, 315100 China.
Light Sci Appl. 2019 May 1;8:41. doi: 10.1038/s41377-019-0153-y. eCollection 2019.
Multiphoton quantum states play a critical role in emerging quantum technologies and greatly improve our fundamental understanding of the quantum world. Integrated photonics is well recognized as an attractive technology offering great promise for the generation of photonic quantum states with high-brightness, tunability, stability, and scalability. Herein, we demonstrate the generation of multiphoton quantum states using a single-silicon nanophotonic waveguide. The detected four-photon rate reaches 0.34 Hz even with a low-pump power of 600 μW. This multiphoton quantum state is also qualified with multiphoton quantum interference, as well as quantum state tomography. For the generated four-photon states, the quantum interference visibilities are greater than 95%, and the fidelity is 0.78 ± 0.02. Furthermore, such a multiphoton quantum source is fully compatible with the on-chip processes of quantum manipulation, as well as quantum detection, which is helpful for the realization of large-scale quantum photonic integrated circuits (QPICs) and shows great potential for research in the area of multiphoton quantum science.
多光子量子态在新兴量子技术中起着关键作用，并极大地增进了我们对量子世界的基本理解。集成光子学被公认为是一项极具吸引力的技术，在产生具有高亮度、可调谐性、稳定性和可扩展性的光子量子态方面具有巨大潜力。在此，我们展示了利用单硅纳米光子波导产生多光子量子态。即使在600 μW的低泵浦功率下，检测到的四光子率仍达到0.34 Hz。这种多光子量子态还通过多光子量子干涉以及量子态层析成像得到了验证。对于所产生的四光子态，量子干涉可见度大于95%，保真度为0.78±0.02。此外，这样的多光子量子源与量子操纵以及量子检测的片上工艺完全兼容，这有助于实现大规模量子光子集成电路（QPIC），并在多光子量子科学领域的研究中显示出巨大潜力。
