基于FNP-ADC模型的弹药调度系统保障效能评估

正确评估诸如弹药调度系统此类复杂武器装备的系统效能,可为作战指挥决策提供重要支撑依据,从装备系统结构组成及复杂性出发,合理地表示工作状态及其转移过程,在流水网络计划(flow network planning,FNP)技术框架下应用ADC模型开展效能评估.以FNP时间参数为基础,确定了组成分系统故障一般概率分布下的可用性、可信性和保障能力表示方法,分别表示为影响因素的函数关系,最终建立了FNP-ADC模型.综合进行保障效能评估,可进一步分析因素对效能的影响程度,并给出了案例分析.     

Increasing Success Probability of a Probabilistic Quantum Teleportation

The probabilistic quantum teleportation scheme [Phys. Lett. A 305 （2002） 12] is improved via two seemingly different methods （i.e., the usual aneilla method and the so-called Kraus method）, respectively. The essence of the improvements is to fetch a part from the residues so that the success probability is accordingly increased. The two improved versions and a similar protocol proposed by Li et al. [Phys. Rev. A 61 （2000） 034301] are compared mutually and discussed. It is found that they are equally efficient and can reach the success probability threshold determined by the inherent entanglement of the quantum channel.     

2014年度全国检测声学会议在北京成功召开

2014年度全国检测声学会议在北京成功召开     

中国声学学会成功获得2021年国际超声大会(ICU)的会议举办权

中国声学学会成功获得2021年国际超声大会（ICU）的会议举办权     

物理演示实验六大教学原则

根据物理演示实验教学的特点和要求, 创建物理演示实验六大教学原则: 科学性物理演示实验教学原 则、 成功性物理演示实验教学原则、 直观性物理演示实验教学原则、 配合性物理演示实验教学原则、 示范性物理演 示实验教学原则、 安全性物理演示实验教学原则     

中国科学院声学研究所第四届青年学术会议在京成功举办

中国科学院声学研究所第四届青年学术会议于2012年10月9日到10日在北京成功举办。本次会议由中国科学院声学研究所学术委员会举办,科技处承办,是继1999年、2003年和2009年前三届青年学术会议之后的又一次青年学术大会。声学所所长王小民和所党委书记张春华等所领导出     

Entanglement concentration for a non-maximally entangled four-photon cluster state

We present a scheme for locally concentrating a non-maximally entangled four-photon cluster state into a maximally-entangled four-photon cluster state. This scheme has a high success probability. The controlled-NOT （CNOT） gate is a crucial ingredient in this scheme, and we use a nearly deterministic CNOT gate, which is similar with that first introduced by Nemoto et al. （Phgs. Rev. Lett., 2004, 93： 250502）. This CNOT gate has a simple structure and does not need the strong nonlinearity.     

Markov链中连续成功次数的一个极限定理

本文将独立Bernoulli试验中关于连续成功次数的D.J.Newman定理推广到了Maxkov链场合,同时还得到了相应序列的极限点全体。     

Controlled Remote Preparation of a Two-Qubit State via an Asymmetric Quantum Channel

I present a new scheme for probabilistic remote preparation of a general two-qubit state from a sender to either of two receivers. The quantum channel is composed of a partial entangled tripartite Greenberger-Horne-Zeilinger (GHZ) state and a W-type state. I try to realize the remote two-qubit preparation by using the usual projective measurement and the method of positive operator-valued measure, respectively. The corresponding success probabilities of the scheme with different methods as well as the total classical communicationcost required in this scheme are also calculated.     

Enhancing the precision of phase estimation by weak measurement and quantum measurement reversal

The enhancement of the precision of phase estimation in quantum metrology is investigated by employing weak measurement （WM） and quantum measurement reversal （QMR）. We derive the exact expressions of the optimal quantum Fisher information （QFI） and success probability of phase estimation for an exactly solving model consisting of a qubit interacting with a structured reservoir. We show that the QFI can be obviously enhanced by means of the WM and QMR in different regimes. In addition, we also show that the magnitude of the decoherence involved in the WM and QMR can be a general complex number, which extends the applicable scope of the WM and QMR approach.