The entanglement evolution of the coupled qubits interacting with a non-Markov environment is investigated in terms of concurrence. The results show that the entanglement of the quantum systems depends not only on the...The entanglement evolution of the coupled qubits interacting with a non-Markov environment is investigated in terms of concurrence. The results show that the entanglement of the quantum systems depends not only on the initial state of the system but also on the coupling between the qubit and the environment. For the initial state （100） ± ｜11〉）/√2, the coupled qubits will always been in the maximum entangled state under an asymmetric coupling. For the initial state （｜01〉 ± ＋10〉）/√2, in contrast, the entangling degree of the coupled qubits is always equal to unity and does not depend on the evolving time under the symmetric coupling. We find that the stronger the interaction between the qubits is, the better the struggle against the entanglement sudden death is.展开更多
We explore the entropy uncertainty for qutrit system under non-Markov noisy environment and discuss the effects of the quantum memory system and the spontaneously generated interference(SGI)on the entropy uncertainty ...We explore the entropy uncertainty for qutrit system under non-Markov noisy environment and discuss the effects of the quantum memory system and the spontaneously generated interference(SGI)on the entropy uncertainty in detail.The results show that,the entropy uncertainty can be reduced by using the methods of quantum memory system and adjusting of SGI.Particularly,the entropy uncertainty can be decreased obviously when both the quantum memory system and the SGI are simultaneously applied.展开更多
The non-Markov process exists widely in thermodymanic process,while it usually requires the packing of many transistors and memories with great system complexity in a traditional device structure to minic such functio...The non-Markov process exists widely in thermodymanic process,while it usually requires the packing of many transistors and memories with great system complexity in a traditional device structure to minic such functions.Two-dimensional(2D)material-based resistive random access memory(RRAM)devices have the potential for next-generation computing systems with much-reduced complexity.Here,we achieve a non-Markov chain in an individual RRAM device based on 2D mineral material mica with a vertical metal/mica/metal structure.We find that the potassium ions(K+)in 2D mica gradually move in the direction of the applied electric field,making the initially insulating mica conductive.The accumulation of K+is changed by an electric field,and the 2D-mica RRAM has both single and double memory windows,a high on/off ratio,decent stability,and repeatability.This is the first time a non-Markov chain process has been established in a single RRAM,in which the movement of K+is dependent on the stimulated voltage as well as their past states.This work not only uncovers an intrinsic inner ionic conductivity of 2D mica,but also opens the door for the production of such RRAM devices with numerous functions and applications.展开更多
目的评价晚期非小细胞肺癌二线治疗药物帕博利珠单抗、纳武利尤单抗的经济性。方法基于医疗卫生角度,构建动态Markov模型,模拟至99%患者死亡时,产生的医疗成本和质量调整生命年(Qualityadjusted life years,QALYs)。临床参数来自临床试...目的评价晚期非小细胞肺癌二线治疗药物帕博利珠单抗、纳武利尤单抗的经济性。方法基于医疗卫生角度,构建动态Markov模型,模拟至99%患者死亡时,产生的医疗成本和质量调整生命年(Qualityadjusted life years,QALYs)。临床参数来自临床试验和间接比较。成本数据和效用值取自相关网站和已发表的文献。敏感性分析用于评估模型参数的不确定性。结果基础分析结果显示,纳武利尤单抗方案的治疗成本为278634元,获得的QALYs为0.88,帕博利珠单抗方案的治疗成本为232596元,QALYs为0.86,两者的增量成本-效果比(Incremental cost effectiveness ratio,ICER)为2301900元/QALY,均远高于支付阈值(257094元)。单因素敏感性分析显示,药品价格、无进展生存期对ICER的影响较大。结论在当前支付阈值下,纳武利尤单抗较帕博利珠单抗无经济性优势,两者的成本和QALYs值差异不大,药品价格变动极有可能逆转经济性结论。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.10864002)
文摘The entanglement evolution of the coupled qubits interacting with a non-Markov environment is investigated in terms of concurrence. The results show that the entanglement of the quantum systems depends not only on the initial state of the system but also on the coupling between the qubit and the environment. For the initial state （100） ± ｜11〉）/√2, the coupled qubits will always been in the maximum entangled state under an asymmetric coupling. For the initial state （｜01〉 ± ＋10〉）/√2, in contrast, the entangling degree of the coupled qubits is always equal to unity and does not depend on the evolving time under the symmetric coupling. We find that the stronger the interaction between the qubits is, the better the struggle against the entanglement sudden death is.
基金Project supported by the National Natural Science Foundation of China(Grant No.11374096)。
文摘We explore the entropy uncertainty for qutrit system under non-Markov noisy environment and discuss the effects of the quantum memory system and the spontaneously generated interference(SGI)on the entropy uncertainty in detail.The results show that,the entropy uncertainty can be reduced by using the methods of quantum memory system and adjusting of SGI.Particularly,the entropy uncertainty can be decreased obviously when both the quantum memory system and the SGI are simultaneously applied.
基金This work was supported by the National Natural Science Foundation of China(51920105002,51991340,51722206,and 51991343)Guangdong Innovative and Entrepreneurial Research Team Program(2017ZT07C341)+1 种基金the Bureau of Industry and Information Technology of Shenzhen for the“2017 Graphene Manufacturing Innovation Center Project”(201901171523)the Shenzhen Basic Research Program(JCYJ20200109144620815 and JCYJ20200109144616617).
文摘The non-Markov process exists widely in thermodymanic process,while it usually requires the packing of many transistors and memories with great system complexity in a traditional device structure to minic such functions.Two-dimensional(2D)material-based resistive random access memory(RRAM)devices have the potential for next-generation computing systems with much-reduced complexity.Here,we achieve a non-Markov chain in an individual RRAM device based on 2D mineral material mica with a vertical metal/mica/metal structure.We find that the potassium ions(K+)in 2D mica gradually move in the direction of the applied electric field,making the initially insulating mica conductive.The accumulation of K+is changed by an electric field,and the 2D-mica RRAM has both single and double memory windows,a high on/off ratio,decent stability,and repeatability.This is the first time a non-Markov chain process has been established in a single RRAM,in which the movement of K+is dependent on the stimulated voltage as well as their past states.This work not only uncovers an intrinsic inner ionic conductivity of 2D mica,but also opens the door for the production of such RRAM devices with numerous functions and applications.
