Subjects: Optics >> Quantum optics submitted time 2023-02-19
Bo-Yu Xu
Li-Kun Chen
Jintian Lin
Lan-Tian Feng1
Rui Niu
Zhi-Yuan Zhou
Renhong Gao
Chun-Hua Dong
Guang-Can Guo
Qihuang Gong
Ya Cheng
Yun-Feng Xiao
Xi-Feng Ren
Abstract： On-chip bright quantum sources with multiplexing ability are extremely high in demand for the integrated quantum networks with unprecedented scalability and complexity. Here, we demonstrate an ultrabright and broadband biphoton quantum source generated in a lithium niobate microresonator system.Without introducing the conventional domain poling, the on-chip microdisk produces entangled photon pairs covering a broad bandwidth promised by natural phase matching in spontaneous parametric down conversion.Experimentally, the multiplexed photon pairs are characterized by $30\ \rm nm$ bandwidth limited by the filtering system, which can be furthered enlarged.Meanwhile, the generation rate reaches $5.13\ {\rm MHz}/\upmu \rm W$ with a coincidence-to-accidental ratio up to $804$.Besides, the quantum source manifests the prominent purity with heralded single photon correlation $g_H^{(2)}(0)=0.0098\pm0.0021$ and energy-time entanglement with excellent interference visibility of $96.5\%\pm1.9\%$. Such quantum sources at the telecommunication band pave the way for high-dimensional entanglement and future integrated quantum information systems.
Peer Review Status:
Awaiting Review
Hits
Hits
Downloads
Comment