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Your search keyword '"Li, Sheng-Yong"' showing total 32 results
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32 results on '"Li, Sheng-Yong"'

1. On-demand shaped photon emission based on a parametrically modulated qubit

Author

Li, Xiang, Li, Sheng-Yong, Zhao, Si-Lu, Mei, Zheng-Yang, He, Yang, Deng, Cheng-Lin, Liu, Yu, Liu, Yan-Jun, Liang, Gui-Han, Wang, Jin-Zhe, Song, Xiao-Hui, Xu, Kai, Heng, Fan, Zhang, Yu-Xiang, Xiang, Zhong-Cheng, and Zheng, Dong-Ning

Subjects
Quantum Physics
Abstract

In the circuit quantum electrodynamics architectures, to realize a long-range quantum network mediated by flying photon, it is necessary to shape the temporal profile of emitted photons to achieve high transfer efficiency between two quantum nodes. In this work, we demonstrate a new single-rail and dual-rail time-bin shaped photon generator without additional flux-tunable elements, which can act as a quantum interface of a point-to-point quantum network. In our approach, we adopt a qubit-resonator-transmission line configuration, and the effective coupling strength between the qubit and the resonator can be varied by parametrically modulating the qubit frequency. In this way, the coupling is directly proportional to the parametric modulation amplitude and covers a broad tunable range beyond 20 MHz for the sample we used. Additionally, when emitting shaped photons, we find that the spurious frequency shift (-0.4 MHz) due to parametric modulation is small and can be readily calibrated through chirping. We develop an efficient photon field measurement setup based on the data stream processing of GPU. Utilizing this system, we perform photon temporal profile measurement, quantum state tomography of photon field, and quantum process tomography of single-rail quantum state transfer based on a heterodyne measurement scheme. The single-rail encoding state transfer fidelity of shaped photon emission is 90.32%, and that for unshaped photon is 97.20%, respectively. We believe that the fidelity of shaped photon emission is mainly limited by the qubit coherence time. The results demonstrate that our method is hardware efficient, simple to implement, and scalable. It could become a viable tool in a high-quality quantum network utilizing both single-rail and dual-rail time-bin encoding.

Published
2024

26. Modification of B3 Model for Sealed Concrete with Additives Based on Experimental Observations.

Author

Chen Bao-chun, Shrestha, Krishna Man, and Li Sheng-yong

Subjects
REGRESSION analysis, TEMPERATURE, CIVIL engineering, STIFFNESS (Engineering), STEEL tubes
Abstract

Thirteen specimens were tested out of which nine were for creep of sealed concrete and four for shrinkage test, for a period of 700 d under controlled temperature condition. The experimental results for creep and shrinkage were compared with creep and shrinkage computation model B3 and distinct discrepancies between observed and calculated creep and shrinkage strains were observed. Based on regression analysis, modification on B3 model has been formulated which will be applicable at least for concrete of characteristics strength of C40 and C50 with additives. Besides, on the basis of observation on identical specimens with varied stress strength ratio, a function is generated which accounts effect of stress strength ratio on creep. Finally, Civil Engineering community is suggested not to follow the creep prediction models without correction at least for modern concrete, as they do not account the effect of additives on its compliance function. [ABSTRACT FROM AUTHOR]

Published
2011

27. Adjustment of B3 model for drying concrete with additives based on experimental data.

Author

SHRESTHA, Krishna Man, CHEN Bao-chun, and LI Sheng-yong

Subjects
DRYING of concrete, CONCRETE additives, CONCRETE durability, REGRESSION analysis, STRUCTURAL analysis (Engineering), STRENGTH of materials
Abstract

All currently avalable concrete creep predicting models cannot describe well the creep of a concrete structure because they all leave the effects of additives out of consideration. The purpose of this work was to modify model B3 for overcoming this deficiency. We tested thirteen specimens of C40 and C50 concrete with additives, out of which nine were for creep and four for shrinkage tests over a 700 d period under controlled temperature. We compared the experimental results for creep and shrinkage with those obtained by using model B3, and derived modification terms through regression analysis. Based on the experimental results of identical specimens under varied stress levels, we also derived a function considering the effect of stress level on creep. It is suggested that the creep prediction models without adjustment should not be used for modern concrete with a variety of additives. [ABSTRACT FROM AUTHOR]

Published
2010

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