【摘 要】
：
The Loschmidt echo is a useful diagnostic for the perfection of quantum time-reversal process and the sensitivity of quantum evolution to small perturbations.The main challenge for measuring the Loschmidt echo is the time reversal of a quantum evolution.I
【机 构】
：
Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sci
论文部分内容阅读
The Loschmidt echo is a useful diagnostic for the perfection of quantum time-reversal process and the sensitivity of quantum evolution to small perturbations.The main challenge for measuring the Loschmidt echo is the time reversal of a quantum evolution.In this work,we demonstrate the measurement of the Loschmidt echo in a superconducting 10-qubit system using Floquet engineering and discuss the imperfection of an initial Bell-state recovery arising from the next-nearest-neighbor(NNN)coupling present in the qubit device.Our results show that the Loschmidt echo is very sensitive to small perturbations during quantum-state evolution,in contrast to the quantities like qubit population that is often considered in the time-reversal experiment.These properties may be employed for the investigation of multiqubit system concerning many-body decoherence and entanglement,etc.,especially when devices with reduced or vanishing NNN coupling are used.
其他文献
The emerging perovskite solar cells have been recognized as one of the most promising new-generation photovoltaic technologies owing to their potential of high efficiency and low production cost.However,the current perovskite solar cells suffer from some
The effects of the deficiency of the allergenic α-subunit on soybean amino acid (AA) composition were studied using the cultivar Dongnong 47 (DN47) as a genetic background. The near-isogenic line (NIL) NIL-DN47-Δα of DN47, with an introgression of the α-n
目前高校劳动教育存在劳动教育观念出现偏差、课程设置匮乏、教育载体不足、教育成效不高的问题.以农事技能通识训练课程为主线,构建新时代高校劳动教育课程,并从课程目标、课程内容、课程方法、课程评价4个方面进行统筹设计,以期为当前高校的劳动教育课程设置提供有益的经验.
In order to determine the most suitable sowing periods for maize in the cold area of Harbin City, the field test method was adopted. From 2018 to 2019, the main maize variety Xianyu 696 which was planted in Harbin City, Heilongjiang Province, was used as
Silver indium cadmium(Ag-In-Cd)control rod is widely used in pressurized water reactor nuclear power plants,and it is continuously consumed in a high neutron flux environment.The mass ratio of 107Ag in the Ag-In-Cd con-trol rod is 41.44％.To accurately cal
随着新课改制度的实行,小学体育教学也发生了很大的变化,强调教师需遵循“健康第一”的教学理念,突出学生的学习主体地位,引导学生掌握体育知识与技能的同时,培养学生良好的体育素养.因此,为了更好地提高体育教学质量,教师应更加注重师生之间的有效互动,这样,不但能够拉进师生之间的距离,还有助于教师更好地开展体育教学活动.本文就小学体育教学中师生有效互动的教学活动展开相应的探究.
Trehalose synthase is an important functional enzyme in the synthesis of trehalose in organisms and also participates in plant stress-resistant physiological processes. The transcriptomic study showed that a trehalose-6-phosphate synthase gene was respons
In this study, the hydrolytic amino acids of Chinese human and Holstein cow milk of different lactation periods were analyzed by the advanced isobaric tags for relative and absolute quantitation (iTRAQ) combined with the high performance liquid chromatogr
In order to obtain pure enzyme with high activity, two amylase producing strains were isolated from soil samples, and named as the strains LZ-10 and LZ-11. According to morphologic observation, physiology and biochemistry experiments, 16S rRNA and gyrB ge
采用水煎煮法和乙醇回流提取法对苦参及其炮制品进行提取,采用牛津杯法测定金黄色葡萄球菌和大肠杆菌的体外最小抑菌浓度(MIC),研究不同提取方法、炮制方法对苦参的抗菌效果.结果表明,醇提液中生品提取液和醋炙品提取液对金黄色葡萄球菌的抑制效果较好,而对大肠杆菌的抑菌效果最好的是生品提取液,MIC值均为0.0125 g/mL;水提液中炒焦品提取液对金黄色葡萄球菌和大肠杆菌的抑菌效果较好,MIC值分别为0.1和0.2 g/mL.其中醇提液抑菌效果较水提液抑菌效果好;醇提液对大肠杆菌的抑制效果好于金黄色葡萄球菌;水提