High-performance quantum entanglement generation via cascaded second-order nonlinear processes
Zichang Zhang,Chenzhi Yuan,Si Shen,Hao Yu,Ruiming Zhang,Heqing Wang,Hao Li,You Wang,You Wang,Guang-Wei Deng,Guang-Wei Deng,Zhiming Wang,Zhiming Wang,Lixing You,Zhen Wang,Hai-Zhi Song,Hai-Zhi Song,Guang-Can Guo,Guang-Can Guo,Qiang Zhou,Qiang Zhou +20 more
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In this paper, the authors demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO3 (PPLN) waveguide.Abstract:
In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO3 (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e., second-harmonic generation (SHG) and spontaneous parametric downconversion (SPDC), to generate photon-pairs. Previously, the performance of the photon-pairs is contaminated by Raman noise photons. Here by fiber-integrating the PPLN waveguide with noise-rejecting filters, we obtain a coincidence-to-accidental ratio (CAR) higher than 52,600 with photon-pair generation and detection rate of 52.36 kHz and 3.51 kHz, respectively. Energy-time, frequency-bin, and time-bin entanglement is prepared by coherently superposing correlated two-photon states in these degrees of freedom, respectively. The energy-time entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.71 ± 0.02 with two-photon interference visibility of 95.74 ± 0.86%. The frequency-bin entangled two-photon states achieve fidelity of 97.56 ± 1.79% with a spatial quantum beating visibility of 96.85 ± 2.46%. The time-bin entangled two-photon states achieve the maximum value of CHSH-Bell inequality of S = 2.60 ± 0.04 and quantum tomographic fidelity of 89.07 ± 4.35%. Our results provide a potential candidate for the quantum light source in quantum photonics.read more
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InGaP quantum nanophotonic integrated circuits with 1.5% second-order nonlinearity
Mengdi Zhao,Kejie Fang +1 more
TL;DR: In this article, the authors demonstrate photon-pair generation via degenerate spontaneous parametric down conversion in the InGaP photonic circuit with an ultrahigh rate exceeding 27.5 MHz per 1 $\mu$W pump power and large coincidence-toaccidental ratio up to $1.5\%$.
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InGaP quantum nanophotonic integrated circuits with 1.5% nonlinearity-to-loss ratio
TL;DR: In this article , quantum nanophotonic integrated circuits in thin-film InGaP with a record-high ratio of $1.5\%$ between the single-photon nonlinear coupling rate (g/2π π=11.2$ MHz) and cavityphoton loss rate were presented.
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Electrically Tunable Second Harmonic Generation in Atomically Thin ReS2.
Jing Wang,Nannan Han,Zheng-Dong Luo,Mingwen Zhang,Xiaoqing Chen,Yang Liu,Yue Hao,Jianlin Zhao,Xuetao Gan +8 more
TL;DR: In this article , the authors report the electrically tunable second-order nonlinearity in atomically thin ReS2 flakes benefiting from their distorted 1T crystal structure and interlayer charge transfer.
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GHz-pulsed source of entangled photons for reconfigurable quantum networks
Meritxell Cabrejo Ponce,Christopher Spiess,A. L. Marques Muniz,Philippe Ancsin,Fabian Steinlechner +4 more
TL;DR: In this paper , a fiber-based Sagnac loop is used to generate entangled photons at the telecom wavelength with high efficiency and fidelities above 0.99, and phase modulation up to GHz before entangled state generation is also possible for fast entangled state switching.
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High-Performance Hyperentanglement Generation and Manipulation Based on Lithium Niobate Waveguides
TL;DR: In this article , the authors demonstrate the generation and manipulation of hyperentanglement in polarization and time-energy degrees of freedom using a high-efficiency periodically poled lithium niobate (PPLN) waveguide in a fiber Sagnac loop.
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