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Calibration of a co.pact absolute atomic gravimeter

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Chinese Physics B 2020年第9期29卷 84-91页

作者： Hong-Tai Xie Bin Chen Jin-Bao Long Chun Xue Luo-Kan Chen Shuai Chen Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaShanghai 201315China Shanghai Research Center for Quantum Sciences Shanghai 201315China Shanghai Division QuantumCTek Co.Ltd.Shanghai 201315China

co.pact atomic gravimeters are the potential next generation precision instruments for gravity survey from fundamental research to broad field *** report the calibration results of our home build co.pact absolute atomic gravimeter USTC-AG02 at Changping Campus,the National Institute of Metrology(NIM),China in January *** sensitivity of the atomic gravimeter reaches 35.5μGal/√Hz(1μGal=1×10-8 m/s2)and its long-term stability reaches 0.8μGal for averaging over 4000 *** the statistical uncertainty,the dominant instrumental systematic errors and environmental effects are evaluated and co.rected within a total uncertainty(2σ)of 15.3μ*** co.pared with the reference g value given by the co.ner cube gravimeter NIM-3A,the atomic gravimeter USTC-AG02 reaches the degree of equivalence of 3.7μGal.

关键词： atom interferometry absolute gravimeter systematic errors

Tilt adjustment for a portable absolute atomic gravimeter

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Chinese Physics B 2020年第7期29卷 295-299页

For an atomic gravimeter,the measured value of the Earth’s gravity acceleration g is the projection of the local gravity on the direction of Raman laser *** accurately measure the g,the Raman laser beams should be parallel to the g *** analyze the tilt effect of the Raman beams on g measurement and present a general method for the tilt *** systematic error caused by the tilt angle is evaluated as 0(+0,0.8)µGal(1µGal=10 nm/s^2)and the drift is also co.pensated in real *** method is especially suitable for the portable atomic gravimeter which focuses on the mobility and field applications.

关键词： atomic gravimeter systematic error tilt adjustment stability

Quantum co.putational advantage via 60-qubit 24-cycle random circuit sampling

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Science Bulletin 2022年第3期67卷 240-245页

作者： Qingling Zhua Sirui Cao Fusheng Chen Ming-Cheng Chen Xiawei Chen Tung-Hsun Chung Hui Deng Yajie Du Daojin Fan Ming Gong Cheng Guo Chu Guo Shaojun Guo Lianchen Han Linyin Hong He-Liang Huang Yong-Heng Huo Liping Li Na Li Shaowei Li Yuan Li Futian Liang Chun Lin Jin Lin Haoran Qian Dan Qiao Hao Rong Hong Su Lihua Sun Liangyuan Wang Shiyu Wang Dachao Wu Yulin Wu Yu Xu Kai Yan Weifeng Yang Yang Yang Yangsen Ye Jianghan Yin Chong Ying Jiale Yu Chen Zha Cha Zhang Haibin Zhang Kaili Zhang Yiming Zhang Han Zhao Youwei Zhao Liang Zhou Chao-Yang Lu Cheng-Zhi Peng Xiaobo Zhu Jian-Wei Pan Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Shanghai Branch CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaShanghai 201315China Shanghai Research Center for Quantum Sciences Shanghai 201315China quantumctek co. Ltd.Hefei 230026China Henan Key Laboratory of Quantum Information and Cryptography Zhengzhou 450000China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China

To ensure a long-term quantum co.putational advantage,the quantum hardware should be upgraded to withstand the co.petition of co.tinuously improved classical algorithms and ***,we demonstrate a superco.ducting quantum co.puting systems Zuchongzhi 2.1,which has 66 qubits in a two-dimensional array in a tunable co.pler *** readout fidelity of Zuchongzhi 2.1 is co.siderably improved to an average of 97.74%.The more powerful quantum processor enables us to achieve larger-scale random quantum circuit sampling,with a system scale of up to 60 qubits and 24 cycles,and fidelity of FXEB=(3·66±0·345)×10^(-4).The achieved sampling task is about 6 orders of magnitude more difficult than that of Sycamore[Nature 574,505(2019)]in the classic simulation,and 3 orders of magnitude more difficult than the sampling task on Zuchongzhi 2.0[arXiv:2106.14734(2021)].The time co.sumption of classically simulating random circuit sampling experiment using state-of-the-art classical algorithm and superco.puter is extended to tens of thousands of years(about 4·8×104years),while Zuchongzhi 2.1 only takes about 4.2 h,thereby significantly enhancing the quantum co.putational advantage.

关键词： Quantum physics Quantum co.putation Quantum information Superco.ducting quantum co.puting Superco.ducting qubit