Remote Operation on Quantum State Among Multiparty

In this paper, a scheme is proposed for performing remote operation on quantum state among multiparty. We use three-particle GHZ state as quantum channels to prepare a state operator, which describes quantum correlation between states and operations. Based on the special characteristic of the state operator, observers can perform unitary operation on a system that is away from observers. Our studies show this process is deterministic. We further consider remote operation among N spatially distributed observers, and the results show the successful realization of remote operation needs collective participation of N parties, that is, there exists strong correlation among multiparty. In addition, we investigate the case in which observers share a three-particle W state as quantum channels to perform remote operation and studies find this process is probabilistic.     

A novel couple images encryption algorithm based on DNA subsequence operation and chaotic system

A novel couple images encryption algorithm based on DNA subsequence operation and chaotic system is presented. Different from the traditional DNA encryption methods, our algorithm is not use complex biological operation, but just uses the idea of DNA subsequence operation (such as elongation operation, truncation operation, and deletion operation). And then, do the DNA addition operation under the Chen's Hyper-chaotic map in this image cipher. The simulation experimental results and security analysis show that our algorithm not only has good encryption effect, but also has the ability of resisting exhaustive attack and statistical attack.     

基于TOAD的10Gb/s全光或门

基于太赫兹光非对称解复用器（TOAD），提出了一种全光或门的实现方案.从TOAD原理出发，从理论上证实了该方案实现全光或运算的可行性.在此基础上进行了实验研究，成功实现了10 Gb/s的全光或运算.实验采用1100和0110编码的两路数据信号，完全验证了或运算真值表中各种可能的情况，并显示出该方案对实现任意编码或伪随机码数据或运算的潜力.对SOA增益恢复时间对结果的影响提出了改进办法.最后分析表明,该方案具有实现超高速高消光比或运算的潜力.     

Efficient generation of two-dimensional cluster states in a cavity QED

We propose a scheme to achieve a kind of nontrivial multipartite pair-wise controlled phase operation in a cavity QED setup. The operation implemented is of geometrical nature and is not sensitive to the thermal state of the cavity. In particular, we have managed to avoid the conventional dispersive coupling so that high speed gate operation is achieved which is very important in view of decoherence. We show that this multipartite pair-wise controlled phase operation makes the generation of two-dimensional cluster states very efficient.     

Transient and steady state analysis of micro ring resonator array based photodetector in optical communication wavelength (linear and nonlinear operation)

Array of micro ring resonators based optical photodetectors is introduced and evaluated in this paper to operate in optical communication windows for broad band situation. In this work, we introduced an array of resonators to engineer the transfer function of the detector for broad band operation as well as very sharp edges. The electron and photon transport in the proposed structure is modeled based on rate equation and then transient and steady state behavior are extracted. Finally nonlinear operation added to the model and its effect on spectral behavior as well as transient operation is investigated.     

Design and operation of an evanescent optical fiber sensor

Design and operation of an optical fiber sensor based on the intensity modulation is reported in this article. Two distinct mechanisms are considered for the optical power loss and the sensor operation is explained in terms of these effects. The dominant loss mechanism is found to be the evanescent loss and based on this phenomenon the optical fiber sensor is designed. Performance of this sensor is tested as a liquid level sensor for water and the experimental results are reported. The dry and wet signals for this probe are measured for a series of measurements and important factors concerning the design and operation of sensor are described. The precision of measured values, reproducibility of the results, and the stability of sensing operation as a function of time are reported. Variation of the output reading of the sensor system for different launching power is also investigated. The output signal of an optical fiber sensor in general is nonlinear, but both the signal difference (dry minus wet) and diff/dry signal ratio for the reported sensor show linear dependence with the launching power at intensities below threshold. The reported results are promising and verify the successful operation of such a device as an on/off level switch and also as a liquid level sensor.     

一种多波长窄线宽环形掺铒光纤激光器

本文提出了一种利用多个光纤光栅串接来实现环形掺铒光纤多波长,窄线宽激光器的新颖方法,并在实验中验证了这一设计的合理性,得到了稳定的双波长输出。     

迈克耳逊干涉仪的调节技巧及常见问题解析

迈克耳逊干涉仪测量光波波长是大学基础物理实验之一。由于该实验操作的复杂性,导致学生完成此实验很容易出现一些问题。根据实际情况列举一些调试技巧,并对经常出现的问题进行了分析与解决。     

一种多波长窄线宽环形掺铒光纤激光器

本文提出了一种利用多个光纤光栅串接来实现环形掺铒光纤多波长，窄线宽激光器的新颖方法，并在实验中验证了这一设计的合理性，得到了稳定的双波长输出．     

Silicon diodes in avalanche pulse-sharpening applications

Silicon diodes operated in an avalanche breakdown mode can he used to reduce, or sharpen, the rise times of driving pulses. Proper operation of a diode in this manner requires the application of a driving pulse with sufficient time rate of change of voltage dV/dt. The rapidly changing reverse bias produces an electron-hole plasma of sufficient density that the electric field strength in the n region of a p⁺-n-n⁺ structure is significantly reduced and the plasma is essentially trapped. In effect, the plasma generation causes the device to transition from a high-impedance state to a low-impedance state in a short period of time, and thus acts as a fast closing switch. This paper provides an overview of this mode of operation. A simplified theory of operation is presented. A comparison is made among the results of numerical modeling, the theory of operation of the silicon avalanche shaper (SAS) diode, and the theory of operation of the trapped-plasma avalanche-triggered transit (TRAPATT) mode of operation of a diode. Based on the results of numerical modeling, conclusions are drawn on what factors most greatly affect the performance of avalanche shaper diodes, and one optimized design is provided     

Fenestration operation in middle ear bone with pulsed infrared lasers: an in-vivo study

The feasibility of fenestration operation in middle ear bone with pulsed infrared laser is evaluated. Healthy male New Zealand rabbits in vivo are used in the experiment. Middle ear mastoid bone of animal model is completely exposed with conventional methods, and then a pulsed CO2 laser （10.6 μm） and an Er：YAG laser （2.94 μm） are used to perform the fenestration operation. Diamond drill is also used as a control group. The total operation time and light irradiation time are recorded and the opening efficiency is assessed. The morphological changes and thermal damage around the opening window on the middle ear bone are examined. It is shown that both laser systems are suitable for the fenestration operation in middle ear bone, and this no-touch technique has a lot of benefits compared with traditional methods. The bleeding during operation has an important effect on operation time and thermal injury and needs to be controlled efficiently in further study.     

Quantum Mutual Authentication Key Agreement Scheme Using Five-Qubit Entanglement towards Different Realm Architecture

In this paper, we propose a scheme of quantum operation teleportation (QOT) utilizing local operations and five-qubit entangled state to achieve mutual authentication and key agreement for two clients in different realms. On the one hand, the scheme not only has the characteristics of the arbitrariness of the relevant operation, the certainty of sharing success and the constancy of entangled resources, but also realizes the mutual authentication among the four parties, ensuring the reliability and security of the task. On the other hand, considering the complexity of the operation, we complete the current QOT task as a whole, so the operation difficulty is low and relatively simple. In summary, our analysis is completely feasible under the existing technical conditions and this proposed scheme has practical significance.

     

A scheme of developing frequency encoded tristate logic operations exploiting nonlinear character of PPLN waveguide and RSOA

In binary logic the information is represented by two distinct states only (0 and 1 state). The major disadvantage of the binary or Boolean logic operation is due to its limitation of large information handling capacity. It is established that tristate operations can be accommodated with optics in data processing, as this type of operation can enhance the operation speed very much as well as information capacity. Here in this communication the authors propose a new concept to implement all-optical different logic gates with tristate mechanism using frequency-encoding principle. For this purpose, co-propagating beams having different frequencies in C-band have used for generating cascaded sum and difference frequency, exploiting the nonlinear response character of periodically poled LiNbO₃ waveguide (PPLN). The highly reflecting property of optical add and drop multiplexer (ADM) and high wavelength conversion property of reflecting semiconductor optical amplifiers (RSOA) have been exploited here to implement the desired AND, NAND,OR and NOR logic operations with tristate. As NAND and NOR are the universal logic operation, so any other member of this logic family may be implemented with these.     

概率性的量子态远程操作

提出一种理论方案,利用量子纠缠特性,实现对量子态的远程操作.采用两粒子非最大纠缠态作为资源,借助于辅助量子位,实现态算子的制备,并利用态算子特性,我们能够以一定的概率实现对量子态的远程操作.这种非局域的操作是量子世界特有的现象,这方面的研究有助于对量子力学基本问题的探讨.     

Rapid phase extraction method based on the difference image between interferograms with unknown phase-shifting amount

In phase-shifting interferometry, based on the difference image between interferograms with unknown phase-shifting amount, a rapid phase extraction method is proposed. In this method, first, by means of the simple subtraction operation between interferograms captured in one phase-shifting period, a sequence of difference images are generated easily; second, to decrease the random phase-shifting errors induced during the phase-shifting procedure, the summation operation is performed for these difference images; third, based on one time phase recovery operation and one time phase-unwrapping operation, the measured phase with high precision can be obtained rapidly. Moreover, in the proposed method, by means of a simple phase summation operation for all pixel-phases in one interferogram, the corresponding phase-shifting amount of interferogram can be determined conveniently.     

Quantum Watermarking Scheme Based on INEQR

Quantum watermarking technology protects copyright by embedding invisible quantum signal in quantum multimedia data. In this paper, a watermarking scheme based on INEQR was presented. Firstly, the watermark image is extended to achieve the requirement of embedding carrier image. Secondly, the swap and XOR operation is used on the processed pixels. Since there is only one bit per pixel, XOR operation can achieve the effect of simple encryption. Thirdly, both the watermark image extraction and embedding operations are described, where the key image, swap operation and LSB algorithm are used. When the embedding is made, the binary image key is changed. It means that the watermark has been embedded. Of course, if the watermark image is extracted, the key’s state need detected. When key’s state is |1〉, this extraction operation is carried out. Finally, for validation of the proposed scheme, both the Signal-to-noise ratio (PSNR) and the security of the scheme are analyzed.     

有机废气处理生物膜滴滤塔操作方式研究

通过对生物膜滴滤塔降解VOC数学模型进行的因次分析,分析了操作方式对生物膜滴滤塔降解性能的影响,并通过实验研究获得了操作方式对滴滤塔降解低浓度甲苯废气的净化性能、填料床内温度分布以及气体进出口温差的影响规律。实验结果表明:相比顺流操作而言,逆流操作时系统的净化效率高,气体进出口温差大;操作方式的不同直接导致了塔内温度分布的改变,在顺流操作时塔上部温升迅速,底部温升平缓;而逆流操作时塔下部温升迅速,顶部温升较小。     

双极性流对低阻抗器件的影响

 分析讨论了双极性流对平面二极管发射电流的影响，并利用PIC程序对平面二极管中的双极性流问题进行了数值对比。在此基础上模拟研究了具有径向发射特点的低阻抗高功率微波器件MILO中的双极性流问题。结果表明：双极性流的出现使器件偏离最佳工作点，使输出功率和效率降低，电压越高，器件偏离最佳工作点就会越远，当电压高到一定值以后会使器件的工作点移至B-H曲线以下，器件处于过绝缘状态，不能正常工作。     

用于脉冲等离子体推力器烧蚀过程仿真的新型机电模型

用于脉冲等离子体推力器(PPT)工作过程仿真的一维机电模型, 具有模型简单、计算周期短等优点, 在PPT设计过程中得到了广泛应用. 本文针对机电模型假设工质烧蚀质量为常数和不考虑烧蚀过程这一局限, 提出了一种采用Teflon一维烧蚀模型计算工质烧蚀质量的改进模型, 并以LES-6 PPT为研究对象进行了仿真. 通过与LES-6 PPT实验数据进行对比, 仿真结果与实验数据符合, 充分验证了模型的可靠性. 此模型能够对Teflon工质在PPT工作过程中的温度变化和烧蚀过程进行仿真, 弥补了机电模型忽略烧蚀过程对仿真结果所造成的影响, 同时, 此模型依然保持了机电模型简单易于实现的优点, 对于脉冲等离子体推力器的设计具有重要意义. 关键词： 脉冲等离子体推力器 机电模型 烧蚀模型 数值仿真     

Plug-and-play dual-phase-modulated continuous-variable quantum key distribution with photon subtraction

Plug-and-play dual-phase-modulated continuous-variable quantum key distribution (CVQKD) protocol can effectively solve the security loopholes associated with transmitting local oscillator (LO). However, this protocol has larger excess noise compared with one-way Gaussian-modulated coherent-states scheme, which limits the maximal transmission distance to a certain degree. In this paper, we show a reliable solution for this problem by employing non-Gaussian operation, especially, photon subtraction operation, which provides a way to improve the performance of plug-and-play dual-phase-modulated CVQKD protocol. The photon subtraction operation shows experimental feasibility in the plug-andplay configuration since it can be implemented under current technology. Security results indicate that the photon subtraction operation can evidently enhance the maximal transmission distance of the plug-and-play dual-phase-modulated CVQKD protocol, which effectively makes up the drawback of the original one. Furthermore, we achieve the tighter bound of the transmission distance by considering the finite-size effect, which is more practical compared with that achieved in the asymptotic limit.