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Programmable silicon-photonic quantum simulator based on a linear combination of unitaries

Photonics Research 2024年第8期12卷 1760-1767页

作者： YUE YU YULIN CHI chonghao zhai JIESHAN HUANG QIHUANG GONG JIANWEI WANG State Key Laboratory for Mesoscopic Physics School of Physics Peking University Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter Peking University Collaborative Innovation Center of Extreme Optics Shanxi University Yangtze Delta Institute of Optoelectronics Peking University Hefei National Laboratory

Simulating the dynamic evolution of physical and molecular systems in a quantum computer is of fundamental interest in many applications. The implementation of dynamics simulation requires efficient quantum algorithms. The Lie-Trotter-Suzuki approximation algorithm, also known as the Trotterization, is basic in Hamiltonian dynamics simulation. A multi-product algorithm that is a linear combination of multiple Trotterizations has been proposed to improve the approximation accuracy. However, implementing such multiproduct Trotterization in quantum computers remains challenging due to the requirements of highly controllable and precise quantum entangling operations with high success probability. Here, we report a programmable integrated-photonic quantum simulator based on a linear combination of unitaries, which can be tailored for implementing the linearly combined multiple Trotterizations, and on the simulator we benchmark quantum simulation of Hamiltonian dynamics. We modify the multi-product algorithm by integrating it with oblivious amplitude amplification to simultaneously reach high simulation precision and high success probability. The quantum simulator is devised and fabricated on a large-scale silicon-photonic quantum chip, which allows the initialization, manipulation, and measurement of arbitrary four-qubit states and linearly combined unitary gates. As an example, the quantum simulator is reprogrammed to emulate the dynamics of an electron spin and nuclear spin coupled system. This work promises the practical dynamics simulations of real-world physical and molecular systems in future large-scale quantum computers. ? 2024 Chinese Laser Press

关键词： Numerical simulation Quantum computation Quantum simulator Quantum technology Signal processing Silicon photonics

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Chip-based quantum communications

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Journal of Semiconductors 2021年第9期42卷 29-36页

作者： Qingqing Wang Yun Zheng chonghao zhai Xudong Li Qihuang Gong Jianwei Wang State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

Quantum communications aim to share encryption keys between the transmitters and receivers governed by the laws of quantum *** quantum photonics offers significant advantages of dense integration,high stability and scalability,which enables a vital platform for the implementation of quantum information processing and quantum *** article reviews recent experimental progress and advances in the development of integrated quantum photonic devices and systems for quantum communications and quantum networks.

关键词： quantum communications quantum networks integrated quantum photonics

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活性MgO含量对改性硫氧镁水泥强度的影响及机理分析

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混凝土与水泥制品 2023年第7期 18-22页

作者：刘冲昊岳雪涛翟庆振于成鑫王硕闫浩康傅培林济南能源工程集团有限公司山东济南250101 山东建筑大学材料科学与工程学院山东济南250101

研究了不同活性MgO含量(60.4%、46.7%、45.9%)对改性硫氧镁水泥强度的影响规律,并结合XRD、SEM等方法分析了其影响机理。结果表明:改性硫氧镁水泥试件的抗压强度均随n(MgO)∶n(MgSO4)的增大而增大;用活性含量为45.9%的MgO制备的水泥试... 详细信息

研究了不同活性MgO含量(60.4%、46.7%、45.9%)对改性硫氧镁水泥强度的影响规律,并结合XRD、SEM等方法分析了其影响机理。结果表明:改性硫氧镁水泥试件的抗压强度均随n(MgO)∶n(MgSO4)的增大而增大;用活性含量为45.9%的MgO制备的水泥试件各龄期抗压强度均高于活性含量为46.7%和60.4%的MgO;改性硫氧镁水泥样品的主要成分为MgO、Mg(OH)2和5Mg(OH)_(2)·MgSO_(4)·7H_(2)O相(5·1·7相),随着养护时间的延长,5·1·7相的衍射峰增强;样品内生成大量针棒状晶体,存在较多空隙。

关键词：改性硫氧镁水泥活性MgO 抗压强度水化产物

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