Remote Preparation of Multipartite Equatorial Entangled States in High Dimensions with Three Parties

A scheme for probabilistic remotely preparing N-particle d-dimensional equatorial entangled states via entangled swapping with three parties is presented. The quantum channel is composed of N - 1 pairs of bipartite d-dimensional non-maximally entangled states and a tripartite d-dimension non-maximally entangled state. It is shown that the sender can help either of the two receivers to remotely prepare the original state, and the N-particle projective measurement and the generalized Hadamard transformation are needed in this scheme. The total success probability and classical communication cost are calculated.     

大屏幕温度及时间显示器的研制

大屏幕时钟及温度显示器目前广泛应用于各种场合，然而目前市场流行的大屏幕时钟及温度显示器均存在时间数据修改困难的缺点，而时钟数据会因使用时间长而产生积累误差，因此必须修改。针对此问题。以AT89C52单片机作为控制核心，采用了红外遥控技术进行编码和解码，实现了10米以内，可稳定有效遥控修改时钟数据。     

基于USB接口的无线幻灯片遥控器

多媒体技术的成熟大大地推动了计算机普及的进程,幻灯片播放正成为最需要无线遥控操作的应用之一。介绍了一种基于USB 2.0接口的无线幻灯片遥控器的设计过程,系统采用AD I公司的ADF7020作为收发芯片,同时配合低功耗的发射控制芯片。阐明了遥控器数据发射和接收的设计工作过程以及对USB接口芯片固件的设计。经过使用测试,本方案具有数据传输稳定、遥控距离远、功耗低等特点,有一定的实用价值,适合推广生产。     

Classical Communication Cost and Probabilistic Remote Preparation of Four-Particle Entangled W State

We present a scheme for probabilistic remote preparation of the four-particle entangled W state by using four partial entangled two-particle states as the quantum channel. In this scheme, if Alice （sender） performs four-particle projective measurements and Bob （receiver） adopts some appropriate unitary operation, the remote state preparation can be successfully realized with certain probability. The classical communication cost is also calculated. However, the success probability of preparation can be increased to 1 for four kinds of special states.     

空调遥控器的设计与生产

红外遥控技已广泛应用于各种家电产品中，空调遥控器作为空调的用户界面，为用户提供了方便的操作工具。本文介绍了空调遥控器的外观和电气性能技术指标，分析了可用于空调遥控器设计的国内外单片机的优缺点，总结了空调遥控器的设计原理，介绍了遥控器的硬件设计，并阐述了软件控制方法，提供了软件程序框图；最后介绍了空调遥控器的实际生产流程与工艺要求，对空调遥控器的设计者与生产厂家具有很高的技术参考价值。