Optimal conclusive teleportation of a d-dimensional two-particle unknown quantum state

A conclusive teleportation protocol of a d-dimensional two-particle unknown quantum state using three d- dimensional particles in an arbitrary pure state is proposed. A sender teleports the unknown state conclusively to a receiver by using the positive operator valued measure（POVM） and introducing an ancillary qudit to perform the generalized Bell basis measurement, We calculate the optimal teleportation fidelity. We also discuss and analyse the reason why the information on the teleported state is lost in the course of the protocol,     

老年人腹腔镜胆囊切除术96例麻醉体会

目的:总结老年患者行腹腔镜胆囊切除手术(LC)的麻醉要点.方法:96例老年患者在静吸复合全麻下行LC,观察气腹前后心率(HR)、收缩压(SBP)、舒张压(DBP)、脉搏氧饱和度(SpO2)、呼气末CO2分压(PETCO2)、气道峰压(Ppeak)、气道平台压(Pplat)各监测指标,对结果结合临床进行分析.结果:3例气腹后心动过缓,最慢45次/min,伴血压下降,经降低气腹压力、减浅麻醉、静脉注射阿托品和麻黄素后纠正.93例在气腹后Ppeak、Pplat均明显升高;PETCO2缓慢上升,伴血压增高,心率加快,通过增加每分钟通气量(增加呼吸频率,适当减少潮气量)维持PETCO24.0～5.3kPa.解除气腹后上述指标明显改善.96例术后均康复出院.结论:老年患者行LC的麻醉要点在于要有完善的术前准备,有效控制CO2气腹对应激反应、血液动力学的改变及呼吸动力和通气的影响,严密监测,及时处理并发症,降低手术及麻醉风险.     

“红色资源”概念的界定

准确界定红色资源的概念,是构建红色资源学科体系的内在要求,也是促进红色资源开发利用的客观需要。纵观学术界现有对红色资源概念界定的理论成果,主要存在对红色资源的内涵主体认识不统一,对红色资源的时间外延有争议,对红色资源的核心词把握不科学以及没有突出转化在红色资源概念界定中应有的地位等问题。通过分析,可以对红色资源的概念作这样的界定:红色资源是指中国人民在中国共产党领导下,在新民主主义革命到改革开放前创造和形成的,可以为我们今天开发利用,且必须经过转化才能够彰显出其当代价值的革命精神及其载体的总和。     

Circular threshold quantum secret sharing

This paper proposes a circular threshold quantum secret sharing （TQSS） scheme with polarized single photons. A polarized single photon sequence runs circularly among any t or more of n parties and any t or more of n parties can reconstruct the secret key when they collaborate. It shows that entanglement is not necessary for quantum secret sharing. Moreover, the theoretic efficiency is improved to approach 100% as the single photons carrying the secret key are deterministically forwarded among any t or more of n parties, and each photon can carry one bit of information without quantum storage. This protocol is feasible with current technology.     

19387例眼病流行病调查

目的 调查大连经济技术开发区的眼病流行病学情况。方法 分析１９３８７例眼科疾病。结果 外眼病占６８．２５％，内眼病占２４．３８％。眼外伤占７．３７％。结论 外眼病多，符合眼病一般发病规律，也显示了新建开发区初期的眼病特点。     

单侧多功能外固定器治疗肱骨干中下段术后骨不连

目的:采用单侧多功能外固定器治疗内固定失败后肱骨骨不连。方法:对20例创伤性肱骨骨折内固定失败骨不连患者,取出内固定物,用单侧多功能外固定器加压固定。结果:20例骨不连患者,经2.5～4个月治疗均获得骨折愈合,关节功能改善。结论:单侧多功能外固定器对内固定失败的肱骨干中下段骨不连是一种较好的固定器械。     

Three-party quantum secret sharing of secure direct communication based on x-type entangled states

Based on x-type entangled states and the two-step protocol [Deng F G, Long G L and Liu X S 2003 Phys. Rev. A 68 042317], a quantum secret sharing protocol of secure direct communication based on x-type entangled states ｜X00〉3214 is proposed. Using some interesting entanglement properties of this state, the agent entirety can directly obtain the secret message from the message sender only if they collaborate together. The security of the scheme is also discussed.     

Universal Three-Party Quantum Secret Sharing Against Collective Noise

we present a robust and universal quantum secret sharing protocol with four-qubit decoherence-free (DF) states against collective noise. The transmission's safety is ensured by the nonorthogonality of the noiseless states traveling on the quantum channel. Although this scheme uses entangled states for encoding, only single-particle product measurements are required.     

An efficient quantum secure direct communication scheme with authentication

In this paper an efficient quantum secure direct communication (QSDC) scheme with authentication is presented, which is based on quantum entanglement and polarized single photons. The present protocol uses Einstein--Podolsky--Rosen (EPR) pairs and polarized single photons in batches. A particle of the EPR pairs is retained in the sender's station, and the other is transmitted forth and back between the sender and the receiver, similar to the `ping--pong' QSDC protocol. According to the shared information beforehand, these two kinds of quantum states are mixed and then transmitted via a quantum channel. The EPR pairs are used to transmit secret messages and the polarized single photons used for authentication and eavesdropping check. Consequently, because of the dual contributions of the polarized single photons, no classical information is needed. The intrinsic efficiency and total efficiency are both 1 in this scheme as almost all of the instances are useful and each EPR pair can be used to carry two bits of information.     

基于模场自积增强检测的光纤声光旋转传感器

介绍了一种应变不敏感的基于模场自积增强检测的光纤声光旋转传感器.通过调节加载到光纤声致光栅上的微波频率能使双模光纤输出高纯度LP_(11)模式.采用自积增强算法显著提高传感分辨比例,改善探测速度,实现对环境旋转角度变化的动态监测.传感器在0°—180°的测量范围内,角度最大测量误差范围小于11%;在轴向应变为100—1500με之间对应变不敏感.