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Variational quantum simulation of thermal statistical states on a superconducting quantum processer
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Xue-Yi Guo 《中国物理 B》2023,32(1):10307-010307
Quantum computers promise to solve finite-temperature properties of quantum many-body systems, which is generally challenging for classical computers due to high computational complexities. Here, we report experimental preparations of Gibbs states and excited states of Heisenberg $XX$ and $XXZ$ models by using a 5-qubit programmable superconducting processor. In the experiments, we apply a hybrid quantum-classical algorithm to generate finite temperature states with classical probability models and variational quantum circuits. We reveal that the Hamiltonians can be fully diagonalized with optimized quantum circuits, which enable us to prepare excited states at arbitrary energy density. We demonstrate that the approach has a self-verifying feature and can estimate fundamental thermal observables with a small statistical error. Based on numerical results, we further show that the time complexity of our approach scales polynomially in the number of qubits, revealing its potential in solving large-scale problems. 相似文献
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In the past years, great progresses have been made on quantum computation and quantum simulation. Increasing the number of qubits in the quantum processors is expected to be one of the main motivations in the next years, while noises in manipulation of quantum states may still be inevitable even the precision will improve. For research in this direction, it is necessary to review the available results about noisy multiqubit quantum computation and quantum simulation. The review focuses on multiqubit state generations, quantum computational advantage, and simulating physics of quantum many-body systems. Perspectives of near term noisy intermediate-quantum processors will be discussed. 相似文献
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基于4-甲基邻苯二甲酸和4,4'-联吡啶混合配体的镉的配合物的合成、结构及荧光性质 总被引:1,自引:1,他引:0
通过Cd(OAc)2.2H2O与4-甲基邻苯二甲酸(H2L)及4,4′-联吡啶(bpy)在水热条件下反应得到一个新型的配位聚合物{[Cd(L)(bpy)(H2O)2.2H2O]}n(1),并用元素分析,红外,热重,粉末衍射及单晶X-射线分析法对配合物的结构进行了表征。配合物首先展示二维层状的网络结构,再进一步通过丰富的氢键堆积成三维超分子结构,另外,本文还研究了该配合物的荧光性质。 相似文献
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使用新型有机钛络合物交联羧甲基羟丙基纤维素(CMHPC),仍得凝胶具备较高的耐温性,热分析结果亦表明交联产物有良好的热稳定性。对有机钛及其它一些金属离子交联CMHPC反应的行为和红外谱图分析显示,CMHPC与金属离子作用时,不仅由羧甲基提供活性络合部位,而且羟丙基也参予反应,交联机制受取代度和反应条件的影响。 相似文献
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可见/近红外光谱检测冷鲜猪肉中的脂肪、蛋白质和水分含量 总被引:12,自引:0,他引:12
采用可见/近红外光谱分析方法对冷鲜猪肉中的脂肪、蛋白质和水分含量进行了研究。光谱数据经多元散射校正(MSC)处理后,分别建立0~4 ℃和20 ℃下的原始光谱、一阶导数和二阶导数的偏最小二乘(PLS)定量分析模型,比较其相关系数(r)、校正标准差(RMSEC)和预测标准差(RMSEP),得到一阶导数处理后的模型最好,并且0~4 ℃下的模型优于20 ℃下的模型。0~4 ℃和20 ℃下脂肪的相关系数(r)分别为0.950和0.924,蛋白质为0.713和0.455,水分为0.944和0.914;脂肪的预测标准差(RMSEP)分别为2.41和2.95,蛋白质为5.44和4.25,水分为2.37和2.38。由此可见,可见/近红外光谱分析方法能够很好的检测冷鲜猪肉中的脂肪和水分,蛋白质的检测结果较差是由冷鲜肉加工工艺引起的。另外,两种温度下光谱曲线在770 nm附近产生了波长漂移,漂移量约10 nm。 相似文献