Spectrally multiplexed and ultrabright entangled photon pairs in a
lithium niobate microresonator
- URL: http://arxiv.org/abs/2110.08997v1
- Date: Mon, 18 Oct 2021 03:30:18 GMT
- Title: Spectrally multiplexed and ultrabright entangled photon pairs in a
lithium niobate microresonator
- Authors: 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, and Xi-Feng Ren
- Abstract summary: We demonstrate an ultrabright and broadband biphoton quantum source generated in a lithium niobate microresonator system.
Such sources at the telecommunication band pave the way for high-dimensional entanglement and future integrated quantum information systems.
- Score: 0.2419996885033735
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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