The hardness of the integer factoring problem(IFP)plays a core role in the security of RSA-like cryptosystems that are widely used today.Besides Shor’s quantum algorithm that can solve IFP within polynomial time,quan...The hardness of the integer factoring problem(IFP)plays a core role in the security of RSA-like cryptosystems that are widely used today.Besides Shor’s quantum algorithm that can solve IFP within polynomial time,quantum annealing algorithms(QAA)also manifest certain advantages in factoring integers.In experimental aspects,the reported integers that were successfully factored by using the D-wave QAA platform are much larger than those being factored by using Shor-like quantum algorithms.In this paper,we report some interesting observations about the effects of QAA for solving IFP.More specifically,we introduce a metric,called T-factor that measures the density of occupied qubits to some extent when conducting IFP tasks by using D-wave.We find that T-factor has obvious effects on annealing times for IFP:The larger of T-factor,the quicker of annealing speed.The explanation of this phenomenon is also given.展开更多
增益噪声温度比(Gain to Noise Temperature Ratio,G/T)是衡量卫星地面接收系统性能的关键指标,其测量精度直接影响系统性能评估的有效性。为提高G/T值的测量精度,系统阐述了利用射电源进行G/T值测试的原理和方法,提出了射电源大气吸收...增益噪声温度比(Gain to Noise Temperature Ratio,G/T)是衡量卫星地面接收系统性能的关键指标,其测量精度直接影响系统性能评估的有效性。为提高G/T值的测量精度,系统阐述了利用射电源进行G/T值测试的原理和方法,提出了射电源大气吸收修正因子、波束展宽修正因子、射电源流量随时间变化修正因子的精确计算模型,并给出了射电源通量密度曲线及修正因子曲线。在此基础上,利用月亮和仙后座A对中等口径天线进行G/T值测量,系统分析了G/T值的测量误差,验证了所提计算模型的有效性,为提高G/T值测量的精确性与可靠性提供了科学依据和实践指导。展开更多
基金the National Natural Science Foundation of China(NSFC)(Grant No.61972050)the Open Foundation of StateKey Laboratory ofNetworking and Switching Technology(Beijing University of Posts and Telecommunications)(SKLNST-2020-2-16).
文摘The hardness of the integer factoring problem(IFP)plays a core role in the security of RSA-like cryptosystems that are widely used today.Besides Shor’s quantum algorithm that can solve IFP within polynomial time,quantum annealing algorithms(QAA)also manifest certain advantages in factoring integers.In experimental aspects,the reported integers that were successfully factored by using the D-wave QAA platform are much larger than those being factored by using Shor-like quantum algorithms.In this paper,we report some interesting observations about the effects of QAA for solving IFP.More specifically,we introduce a metric,called T-factor that measures the density of occupied qubits to some extent when conducting IFP tasks by using D-wave.We find that T-factor has obvious effects on annealing times for IFP:The larger of T-factor,the quicker of annealing speed.The explanation of this phenomenon is also given.
文摘增益噪声温度比(Gain to Noise Temperature Ratio,G/T)是衡量卫星地面接收系统性能的关键指标,其测量精度直接影响系统性能评估的有效性。为提高G/T值的测量精度,系统阐述了利用射电源进行G/T值测试的原理和方法,提出了射电源大气吸收修正因子、波束展宽修正因子、射电源流量随时间变化修正因子的精确计算模型,并给出了射电源通量密度曲线及修正因子曲线。在此基础上,利用月亮和仙后座A对中等口径天线进行G/T值测量,系统分析了G/T值的测量误差,验证了所提计算模型的有效性,为提高G/T值测量的精确性与可靠性提供了科学依据和实践指导。
