Topologically protected valley-dependent quantum photonic circuits
- URL: http://arxiv.org/abs/2103.06686v1
- Date: Thu, 11 Mar 2021 14:18:39 GMT
- Title: Topologically protected valley-dependent quantum photonic circuits
- Authors: Yang Chen, Xin-Tao He, Yu-Jie Cheng, Hao-Yang Qiu, Lan-Tian Feng, Ming
Zhang, Dao-Xin Dai, Guang-Can Guo, Jian-Wen Dong, and Xi-Feng Ren
- Abstract summary: We design and fabricate nanophotonic topological harpoon-shaped beam splitters (HSBSs) based on $120$-deg-bending interfaces.
Two-photon quantum interference, namely, HongOu-Mandel (HOM) interference with a high visibility of 0.956 pm 0.006$, is realized with our 50/50 HSBS.
It is possible to realize more complex quantum circuits with valley-dependent photonic topological insulators, which provides a novel method for on-chip quantum information processing.
- Score: 4.347377904718784
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: Topological photonics has been introduced as a powerful platform for
integrated optics, since it can deal with robust light transport, and be
further extended to the quantum world. Strikingly, valley-contrasting physics
in topological photonic structures contributes to valley-related edge states,
their unidirectional coupling, and even valley-dependent wave-division in
topological junctions. Here, we design and fabricate nanophotonic topological
harpoon-shaped beam splitters (HSBSs) based on $120$-deg-bending interfaces and
demonstrate the first on-chip valley-dependent quantum information process.
Two-photon quantum interference, namely, HongOu-Mandel (HOM) interference with
a high visibility of $0.956 \pm 0.006$, is realized with our 50/50 HSBS, which
is constructed by two topologically distinct domain walls. Cascading this kind
of HSBS together, we also demonstrate a simple quantum photonic circuit and
generation of a path-entangled state. Our work shows that the photonic valley
state can be used in quantum information processing, and it is possible to
realize more complex quantum circuits with valley-dependent photonic
topological insulators, which provides a novel method for on-chip quantum
information processing.
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