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3. Harnessing high-dimensional hyperentanglement through a biphoton frequency comb

Author

Xie, Zhenda, Zhong, Tian, Shrestha, Sajan, Xu, XinAn, Liang, Junlin, Gong, Yan-Xiao, Bienfang, Joshua C., Restelli, Alessandro, Shapiro, Jeffrey H., Wong, Franco N. C., and Wong, Chee Wei

Subjects
Physics - Optics, Quantum Physics
Abstract

Quantum entanglement is a fundamental resource for secure information processing and communications, where hyperentanglement or high-dimensional entanglement has been separately proposed towards high data capacity and error resilience. The continuous-variable nature of the energy-time entanglement makes it an ideal candidate for efficient high-dimensional coding with minimal limitations. Here we demonstrate the first simultaneous high-dimensional hyperentanglement using a biphoton frequency comb to harness the full potential in both energy and time domain. The long-postulated Hong-Ou-Mandel quantum revival is exhibited, with up to 19 time-bins, 96.5% visibilities. We further witness the high-dimensional energy-time entanglement through Franson revivals, which is observed periodically at integer time-bins, with 97.8% visibility. This qudit state is observed to simultaneously violate the generalized Bell inequality by up to 10.95 deviations while observing recurrent Clauser-Horne-Shimony-Holt S-parameters up to 2.76. Our biphoton frequency comb provides a platform in photon-efficient quantum communications towards the ultimate channel capacity through energy-time-polarization high-dimensional encoding.

Published
2015

4. Research on Rebound Strength Measurement Curve of Modified Carbonation Depth of Machine-Made Sand Concrete.

Author

Liang, Junlin, Lin, Jiawei, Lv, Jinlong, Zheng, Shunyuan, Rong, Hongliu, and Yang, Xiaolong

Subjects
*CARBONATION (Chemistry), *CONCRETE, *BATHYMETRY, *COMPRESSIVE strength, *SAND
Abstract

In order to investigate the influence of carbonation treatment on the rebound strength measurement curve of machine-made sand concrete, this study conducted research on the carbonation mechanism sand concrete rebound strength measurement curve through rebound and compressive strength tests using carbonation degree and concrete strength grade as control variables. The results showed that in the short aging period, carbonation treatment had little effect on the compressive strength of manufactured sand concrete but could cause an increase in the rebound value measured by the high-strength and heavy rebound hammers. As the strength grade of the manufactured sand concrete increased, the rebound value measured by both the high-strength and heavy rebound hammers increased accordingly. Compared with the high-strength rebound hammer, the heavy rebound hammer had higher accuracy in detecting the rebound of the carbonated manufactured sand concrete. This study established measurement curves for uncorrected and corrected carbonation depths, among which the accuracy of the corrected carbonation depth measurement curve was higher. At the same time, this measurement curve has been applied to the rebound test of the Pinglu Canal Extra-Large Bridge Project in Guangxi, China, and its practicality and reliability have been verified. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Near-infrared Hong-Ou-Mandel interference on a silicon quantum photonic circuit

Author

Xu, Xinan, Xie, Zhenda, Zheng, Jiangjun, Liang, Junlin, Zhong, Tian, Yu, Mingbin, Kocaman, Serdar, Lo, Guo-Qiang, Kwong, Dim-Lee, Englund, Dirk R., Wong, Franco N. C., and Wong, Chee Wei

Subjects
Physics - Optics, Quantum Physics
Abstract

Near-infrared Hong-Ou-Mandel quantum interference is observed in silicon nanophotonic directional couplers with raw visibilities on-chip at 90.5%. Spectrally-bright 1557-nm two-photon states are generated in a periodically-poled KTiOPO4 waveguide chip, serving as the entangled photon source and pumped with a self-injection locked laser, for the photon statistical measurements. Efficient four-port coupling in the communications C-band and in the high-index-contrast silicon photonics platform is demonstrated, with matching theoretical predictions of the quantum interference visibility. Constituents for the residual quantum visibility imperfection are examined, supported with theoretical analysis of the sequentially-triggered multipair biphoton contribution and techniques for visibility compensation, towards scalable high-bitrate quantum information processing and communications., Comment: 15 pages, 6 figures

Published
2012
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11. The Correlation between Pore Structure and Macro Durability Performance of Road Concrete under Loading and Freeze-Thaw and Drying-Wetting Cycles

Author

Ye Qiu, Wei-an Xuan, Sheng-bo Zhou, and Liang Junlin

Subjects
Mesoscopic physics, Materials science, Article Subject, 0211 other engineering and technologies, General Engineering, 020101 civil engineering, 02 engineering and technology, Fractal dimension, Durability, 0201 civil engineering, Residual strength, 021105 building & construction, Linear regression, lcsh:TA401-492, lcsh:Materials of engineering and construction. Mechanics of materials, General Materials Science, Wetting, Composite material, Porosity, Linear equation
Abstract

The grey correlation theory and multiple regression method are used to reveal macro performance degradation rules of road concrete under loading and freeze-thaw and drying-wetting cycles; then the correlation between mesoscopic pore structure and residual strength and antifreezing index of concrete is analyzed. Under the freeze-thaw and drying-wetting cycles with 50% loading level, the pore structure parameters that influence concrete strength show the following sequence: fractal dimension > most probable pore size > porosity > less harmful pore. The correlation between strength and pore parameters can be represented with multiple nonlinear equations. A negative correlation is shown between strength and fractal dimension and most probable pore size. Conversely, a positive correlation is shown between strength, porosity, and less harmful pore. Under the freeze-thaw and drying-wetting cycles with 80% loading level, the pore structure parameters that influence concrete strength show another sequence: fractal dimension > porosity > less harmful pore > most probable pore size. The correlation between antifreezing index and pore parameters should be described with multiple linear equations. The relative dynamic elastic modulus shows a positive correlation to most probable pore size, pore surface area, and porosity but a negative correlation to less harmful pore and pore spacing coefficient.

Published
2017

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